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04-12-2017, 10:22 AM | #1 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
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Ok folks explain me this one!
I get my new motor in. I hook up my new ignition switch. The very last thing i do is plug my HEI into the fuse panel, then crank. nothing. what the?? eventually i found my HEI wire is 12v, til i plug it into the HEI then it drop to 6v. no there is not a resistor at all. Bad module?
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04-12-2017, 11:18 AM | #2 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,569
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Re: Ok folks explain me this one!
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I am going to move this to the electrical forum. LockDoc
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04-12-2017, 01:00 PM | #3 | |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,715
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Re: Ok folks explain me this one!
Quote:
Well assuming that you have bypassed the resistor wire, from the ignition switch through the firewall connector, to the original points distributor, and run a new wire directly from the fuse panel to the BAtt connection on the HEI distributor. You should not see anything less than 11 volts at the HEI distributor Batt wire connection. If You connected to the IGN UNfused terminal on the fuse panel you would have the correct connection to the distributor for the conversion from points to HEI. Below is the two connections used for the conversion. The first one is the original wiring using the resistance wire and the second shows both the original and the conversion wiring. NOTE that the conversion wiring shows the HEI wire coming directly from the ignition switch through the firewall to the distributor. This can be done but the resistance wire from the firewall to the HEI distributor must be removed and replaced with a regular awg wire usually 12 gauge. Running the wire from the fuse panel does the same thing you just have an extra wire in the circuit. AWG just means standard automotive grade wire. Measuring from the end of the HEI wire to ground with the key on yields 12 volts. You say that when you plug it into the distributor, your reading drops to 6 volts. Where are you taking that reading? Original points wire. HEI conversion coming from the key switch. The left side is the original points side showing the resistance wire and the 12 volts bypass wire from the starter which are both no longer needed.
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04-12-2017, 01:01 PM | #4 |
State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
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Re: Ok folks explain me this one!
What else is on the 12V lead you have connected to your HEI?
ME I would run a direct 12v line from the battery to a relay then to the HEI. Have a switched lead activate the relay.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
04-12-2017, 01:05 PM | #5 |
Registered User
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Location: Lacey, WA
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Re: Ok folks explain me this one!
i have run one from the fuse box and battery, same thing happens. it drops to 6v at the connector all the way to the opposite end
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04-12-2017, 06:32 PM | #6 |
State of Confusion!
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,953
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Re: Ok folks explain me this one!
Is you engine grounded to the cab & frame?
Might be a ground issue?
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
04-12-2017, 07:08 PM | #7 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
Posts: 190
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Re: Ok folks explain me this one!
fixed, was a resistor wire hiding on me :P
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04-18-2017, 09:32 PM | #8 | |
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Join Date: Oct 2010
Location: La Prairie, Quebec
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Re: Ok folks explain me this one!
Quote:
What kind or number of relay? Thanks |
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04-19-2017, 10:51 AM | #9 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
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Re: Ok folks explain me this one!
no need, if you use the IGN leads on your fuase box they already have relays on them, they are behind the cluster
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04-20-2017, 05:05 PM | #10 |
Senior Member
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Location: Winona Lake, IN
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Re: Ok folks explain me this one!
The way I did mine, was remove the original resistor wire from the engine side of the bulkhead connector on the firewall, and replace it with a 12 gauge pink wire connected
to the BATT terminal on the HEI. The wire from the ignition switch to the bulkhead connector on the dash side of he firewall is already a 12 gauge pink wire. This will allow you to run the wire in the stock location and look like a factory installation. You will need a Packard 56 connector, can't remember if it's male or female, for 12 gauge wire. I got mine from the local NAPA store.
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04-20-2017, 05:11 PM | #11 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
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Re: Ok folks explain me this one!
again the IGN is already on a relay
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04-21-2017, 07:08 AM | #12 |
Senior Member
Join Date: Jan 2011
Location: Hayes Va
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Re: Ok folks explain me this one!
There are no relays in a stock fuse box, just taps that are powered through the ignition switch when it is in the run position. I also like to run an hei off a relay. Power from the battery to the relay, power from the relay to the hei bat terminal, new wire from the key switch or from the firewall to the relay and a ground from the relay to the firewall. This bypasses all the old wiring and ensures good voltage to the hei.
Jimmy
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04-21-2017, 08:27 AM | #13 | |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
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Re: Ok folks explain me this one!
Quote:
I like stovebolts method best, because the key receives battery voltage and delivers it directly to the HEI BAT terminal. The relay is another possibility for ignition failure. The best use for relays on our trucks IMO is the headlight relay mod. It takes the burden off the headlight switch of carrying the total headlight voltage and eliminates the voltage drop for the headlights which will give noticeably brighter lights.
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