The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-16-2010, 12:13 AM   #1
DBear
Registered User
 
DBear's Avatar
 
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 805
HEI and Starter wiring?

Okay, on the wire harness in the engine compartment, the one that is used for ignition, starter, etc....my question is how do you wire HEI distributor and starter, etc....??? I know the short green one is for temp switch.
DBear is offline   Reply With Quote
Old 11-16-2010, 12:27 AM   #2
McClinton527
Registered User
 
McClinton527's Avatar
 
Join Date: Sep 2010
Location: Albany, Oregon
Posts: 66
Re: HEI and Starter wiring?

There should be a green wire coming from the firewall wire harness that you need to put a spaid terminal on to the HEI on the (BAT) side. Its a switched power source from the fuse block. The other terminal is simply for a tach. There should be a couple different green wires. Use a test light to determine which one is a switched power source, the temp one wont have any power. The starter is a heavy gauge red wire with a larger eyelit terminal on it that you shouldnt have to mess with. theres also a ground. As far as your one wire alternator goes you need to run one wire from the alternator to the battery to maintain the charge. and the other wire comes from the firewall and I believe is purple
McClinton527 is offline   Reply With Quote
Old 11-16-2010, 12:32 AM   #3
spike38
Registered User
 
spike38's Avatar
 
Join Date: Jun 2010
Location: Leesburg GA
Posts: 547
Re: HEI and Starter wiring?

Hope this helps.

Spike
Attached Images
 
spike38 is offline   Reply With Quote
Old 11-16-2010, 12:42 AM   #4
DBear
Registered User
 
DBear's Avatar
 
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 805
Re: HEI and Starter wiring?

Quote:
Originally Posted by spike38 View Post
Hope this helps.

Spike
on this diagragm, it shows the red wire going to the distributor and the purple going to the starter....that is different than what McClinton had said????
DBear is offline   Reply With Quote
Old 11-16-2010, 12:48 AM   #5
DBear
Registered User
 
DBear's Avatar
 
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 805
Re: HEI and Starter wiring?

I just looked at the harness, and the heavy wire seems to be the purple one....???
DBear is offline   Reply With Quote
Old 11-16-2010, 12:51 AM   #6
05crewcab
Registered User
 
05crewcab's Avatar
 
Join Date: Mar 2010
Location: Minnetonka, MN
Posts: 409
Re: HEI and Starter wiring?

The diagram is correct.

Run a new 12ga wire from the ignition unfused terminal on the fuse block to the BAT terminal on the HEI (red wire above).

Then, there is a solid purple wire to your starter from the fuse box...keep this wire and the heavy + lead from the battery attached to the starter, and disconnect the yellow (it ties to a purple/orange resistance wire as well) from the starter and discard (not shown on diagram)

Follow the diagram and you are all set...only two wires and you'll be up and running.
__________________
1971 C-20 350/350
05crewcab is offline   Reply With Quote
Old 11-16-2010, 12:53 AM   #7
spike38
Registered User
 
spike38's Avatar
 
Join Date: Jun 2010
Location: Leesburg GA
Posts: 547
Re: HEI and Starter wiring?

here is a more complete wiring.

Spike
Attached Images
 
spike38 is offline   Reply With Quote
Old 11-16-2010, 12:58 AM   #8
spike38
Registered User
 
spike38's Avatar
 
Join Date: Jun 2010
Location: Leesburg GA
Posts: 547
Re: HEI and Starter wiring?

Sorry, that didn't work well.
Try this

Spike
Attached Images
    
spike38 is offline   Reply With Quote
Old 11-16-2010, 03:01 AM   #9
DBear
Registered User
 
DBear's Avatar
 
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 805
Re: HEI and Starter wiring?

Quote:
Originally Posted by 05crewcab View Post
The diagram is correct.

Run a new 12ga wire from the ignition unfused terminal on the fuse block to the BAT terminal on the HEI (red wire above).

Then, there is a solid purple wire to your starter from the fuse box...keep this wire and the heavy + lead from the battery attached to the starter, and disconnect the yellow (it ties to a purple/orange resistance wire as well) from the starter and discard (not shown on diagram)

Follow the diagram and you are all set...only two wires and you'll be up and running.
First of all, I want to thank you guys.....

when you say disconnect the yellow, that it ties to a purple/orange resistance wire from the starter and discard..??? can you explain alittle more for this wiring dummy????
DBear is offline   Reply With Quote
Old 11-16-2010, 01:17 PM   #10
05crewcab
Registered User
 
05crewcab's Avatar
 
Join Date: Mar 2010
Location: Minnetonka, MN
Posts: 409
Re: HEI and Starter wiring?

Sure, in stock form, there are two wires from the fuse box that go to the starter. a solid purple wire, and a purple/orange wire. The purple/orange wire T's with a yellow wire before it hits the starter. that yellow wire goes to the coil for the old points distributor system. With HEI, there is no coil, so the yellow and purple/orange wires are not needed any more...you can just cut it off at the fuse panel and toss it. the reason for doing this is the puple/orange wire is a resistance wire, and will get super hot and melt if left connected with no coil.

Now, having all that said, the truck is 40 years old and has probably already been butchered a bit in the wiring department, so your wires may look different....as long as your finished product looks exactly like the diagram above you'll be set:

New 12ga to HEI from ignition unfused in fuse panel (red)
Existing 12ga to Starter from fuse panel(solid purple)
Existing 6ga positive battery cable to Starter from battery (Thick Red or Black)
__________________
1971 C-20 350/350
05crewcab is offline   Reply With Quote
Old 11-16-2010, 01:51 PM   #11
robzilla
Registered User
 
robzilla's Avatar
 
Join Date: Nov 2009
Location: castlegar,b.c
Posts: 277
Re: HEI and Starter wiring?

i'm doing the same upgrade, do i need to run the wire from inside the truck? i ran a wire for the electric choke for the carb from inside fuse box. not sure if there is another "keyed" terminal available inside. which one can i splice into? or should i use the only available terminal (that i used for the electric choke) only for the hei? and splice into something for the choke?
robzilla is offline   Reply With Quote
Old 11-16-2010, 07:55 PM   #12
DBear
Registered User
 
DBear's Avatar
 
Join Date: Nov 2008
Location: Rowlett, TX
Posts: 805
Re: HEI and Starter wiring?

Quote:
Originally Posted by 05crewcab View Post
Sure, in stock form, there are two wires from the fuse box that go to the starter. a solid purple wire, and a purple/orange wire. The purple/orange wire T's with a yellow wire before it hits the starter. that yellow wire goes to the coil for the old points distributor system. With HEI, there is no coil, so the yellow and purple/orange wires are not needed any more...you can just cut it off at the fuse panel and toss it. the reason for doing this is the puple/orange wire is a resistance wire, and will get super hot and melt if left connected with no coil.

Now, having all that said, the truck is 40 years old and has probably already been butchered a bit in the wiring department, so your wires may look different....as long as your finished product looks exactly like the diagram above you'll be set:

New 12ga to HEI from ignition unfused in fuse panel (red)
Existing 12ga to Starter from fuse panel(solid purple)
Existing 6ga positive battery cable to Starter from battery (Thick Red or Black)
That makes sense now.....one question though, when you say "new 12ga to HEI from ignition unfused in fuse panel" ...are you talking about running a red wire from the fuse block in the engine compartment or from the fuse panel inside the truck? Also, when you say unfused, do you mean no inline fuse or something?? I know, I really dont know much about the electrical, but I will give hell trying.
DBear is offline   Reply With Quote
Old 11-16-2010, 08:05 PM   #13
05crewcab
Registered User
 
05crewcab's Avatar
 
Join Date: Mar 2010
Location: Minnetonka, MN
Posts: 409
Re: HEI and Starter wiring?

yeah, fuse block and fuse panel are the same thing. on the fuse panel, there are two spade terminals marked "ign. unfused" use one of those for your new red (or whatever color you like) wire. I have mine snaked through one of the firewall grommets near the steering shaft from inside the cab to the engine bay. it's the top light blue wire in the pic below(the bottom blue one is for my electric choke and tach):
Attached Images
 
__________________
1971 C-20 350/350
05crewcab is offline   Reply With Quote
Old 12-18-2010, 12:30 PM   #14
LostMy65
But Found Her 25yrs Later!
 
LostMy65's Avatar
 
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 9,065
Re: HEI and Starter wiring?

Quote:
Originally Posted by spike38 View Post
Hope this helps.

Spike
It helps tremendously!

Thank you!
__________________
I lost my 65 - Found it 25 years later:
http://67-72chevytrucks.com/vboard/s...d.php?t=426650

66 Service truck build:
http://67-72chevytrucks.com/vboard/s...d.php?t=428035
LostMy65 is offline   Reply With Quote
Old 02-07-2011, 02:17 PM   #15
trebeck
Registered User
 
trebeck's Avatar
 
Join Date: Jan 2008
Location: Charlotte, NC
Posts: 44
Re: HEI and Starter wiring?

Exactly what i was looking for - thanks for the pics and detail, 05 crewcab.
trebeck is offline   Reply With Quote
Old 02-07-2011, 10:38 PM   #16
05crewcab
Registered User
 
05crewcab's Avatar
 
Join Date: Mar 2010
Location: Minnetonka, MN
Posts: 409
Re: HEI and Starter wiring?

Hey, no problem. Good Luck!
__________________
1971 C-20 350/350
05crewcab is offline   Reply With Quote
Old 03-20-2011, 08:24 PM   #17
cerjio
Registered User
 
Join Date: Dec 2008
Location: coffeyville, Kansas
Posts: 195
Re: HEI and Starter wiring?

Quote:
Originally Posted by spike38 View Post
Hope this helps.

Spike
I have a question regarding the black fuseable link wire coming from the positive side of the battery goes to a juction box , an the black wire that shows a fuse inline . my question is this , i dont have a fuseable wire from the battery do I need this an where can i get one, also what size fuse goes into the inline fuse link ? I'm redoing several mistakes PO have done an dont know what to do here!
cerjio is offline   Reply With Quote
Old 03-20-2011, 08:25 PM   #18
cerjio
Registered User
 
Join Date: Dec 2008
Location: coffeyville, Kansas
Posts: 195
Re: HEI and Starter wiring?

I thought my previsou question would show the wire diagram
cerjio is offline   Reply With Quote
Old 03-21-2011, 01:10 AM   #19
spike38
Registered User
 
spike38's Avatar
 
Join Date: Jun 2010
Location: Leesburg GA
Posts: 547
Re: HEI and Starter wiring?

Quote:
Originally Posted by cerjio View Post
I thought my previsou question would show the wire diagram
I'm sorry, I missed that post. I'm going to my shop in the morning.
I'll check the size for you.

Spike
spike38 is offline   Reply With Quote
Old 03-21-2011, 01:46 AM   #20
VetteVet
Msgt USAF Ret
 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,297
Re: HEI and Starter wiring?

Quote:
Originally Posted by cerjio View Post
I have a question regarding the black fuseable link wire coming from the positive side of the battery goes to a juction box , an the black wire that shows a fuse inline . my question is this , i dont have a fuseable wire from the battery do I need this an where can i get one, also what size fuse goes into the inline fuse link ? I'm redoing several mistakes PO have done an dont know what to do here!
If you look at the top of the top diagram you can see the fusible link and the wire with the fuse inline. This fused wire is for the battery charge gauge and works in conjunction with the one on the bottom of the diagram. If you have an idiot light you won't have these wires. The fusible link is nothing but a section of smaller gauge wire inside the wire that goes from the battery positive post to the terminal on the passenger side fender. It feeds and protects the entire positive circuit for the truck. If you don't have this then you are getting your positive voltage to the cab from somewhere else. In 1974 Gm started running the feed wire from the starter large post on the solenoid and the fusible links were moved down there.

The HEI feed wire can also be run from the firewall connector if you remove the orange/blue resistor wire and replace it with a 12 gauge red wire. It runs from the key switch ignition terminal to the firewall block. You can't just hook up the orange/blue wire to the HEI bat terminal because the HEI needs a full 12 volts to fire properly.

You guys can find out all this stuff if you hang out in the electrical forum.
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 03-21-2011, 06:26 AM   #21
cerjio
Registered User
 
Join Date: Dec 2008
Location: coffeyville, Kansas
Posts: 195
Re: HEI and Starter wiring?

Thanks Guys I know about changing out the wire for the Hei an have done that an I have the fuse inline on the batter wire , showing a grey wire , but not sure of the two that come from the battery on the top of the diagram, just needed to know what wire to get an what size fuse to put in the other !
cerjio is offline   Reply With Quote
Old 03-21-2011, 11:57 AM   #22
spike38
Registered User
 
spike38's Avatar
 
Join Date: Jun 2010
Location: Leesburg GA
Posts: 547
Re: HEI and Starter wiring?

Quote:
Originally Posted by cerjio View Post
I thought my previsou question would show the wire diagram
mine is 4amp fuse

spike
spike38 is offline   Reply With Quote
Old 10-02-2012, 10:22 PM   #23
spenceman72
Registered User
 
spenceman72's Avatar
 
Join Date: Aug 2012
Location: N Texas
Posts: 136
Re: HEI and Starter wiring?

This is a great thread and has helped me a bunch. Question, on my starter (Delco starter made for 57 Corvettes, go figure?) the wiring was as follows..
Thick black cable from the + battery post. 12 g ? purple wire that runs into the firewall right by the steering wheel and then a red wire, not sure the size but a bit smaller than the purple wire, that is connected to the same terminal, 's'' on the starter as the purple wire and is connected to the positive post on the electric choke of my Edelbrock carb. I haven't read anything about a wire running from the starter to the carb, so I wonder if this is 'normal'? I was having issues with hot starts so I added a heat shield to the carb, and I was having issues with 'no start' when hot so I removed the headers, added some header wrap the the end portion by the starter and a heat shield to the starter.
Since it was starting before perhaps I should just hope that my 'fixes' for the hot start and no start will work and not worry too much about the wiring..although it does bother me when I find wires and connectors that go no where..perhaps I should chase these down and remove?
thanks!
spenceman72 is offline   Reply With Quote
Old 10-02-2012, 11:03 PM   #24
VetteVet
Msgt USAF Ret
 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,297
Re: HEI and Starter wiring?

Quote:
Originally Posted by spenceman72 View Post
This is a great thread and has helped me a bunch. Question, on my starter (Delco starter made for 57 Corvettes, go figure?) the wiring was as follows..
Thick black cable from the + battery post. 12 g ? purple wire that runs into the firewall right by the steering wheel and then a red wire, not sure the size but a bit smaller than the purple wire, that is connected to the same terminal, 's'' on the starter as the purple wire and is connected to the positive post on the electric choke of my Edelbrock carb. I haven't read anything about a wire running from the starter to the carb, so I wonder if this is 'normal'? I was having issues with hot starts so I added a heat shield to the carb, and I was having issues with 'no start' when hot so I removed the headers, added some header wrap the the end portion by the starter and a heat shield to the starter.
Since it was starting before perhaps I should just hope that my 'fixes' for the hot start and no start will work and not worry too much about the wiring..although it does bother me when I find wires and connectors that go no where..perhaps I should chase these down and remove?
thanks!
The purple wire is the solenoid engagement wire and has power only when the key switch is in start and the neutral start switch is in park or neutral. The red wire that is connected there does not belong and does no good for the choke because the choke coil needs 12 volts anytime the engine is running to pull the choke off.

Your mods for the starter may help or you may need to install a remote starter solenoid. If you search for remote starter solenoid in the search box at the top of the page, You will get enough threads to keep you busy for a week.

If you get no joy then post over in the electrical forum and detail your problem and you'll get lots of help. VV
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:52 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com