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Old 10-04-2020, 07:44 PM   #1
Peanut74
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Wire loom question on installation

Got my cab all painted up and ready for the next step. But I am not sure if I should run the main wire loom first or put the major components (wiper motor, a/c, dash speaker, etc). This is my first time doing a major rewiring and just wanted to get some experienced feedback.
Thanks
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1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 10-04-2020, 08:20 PM   #2
03BlkZ
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Re: Wire loom question on installation

Quote:
Originally Posted by Peanut74 View Post
Got my cab all painted up and ready for the next step. But I am not sure if I should run the main wire loom first or put the major components (wiper motor, a/c, dash speaker, etc). This is my first time doing a major rewiring and just wanted to get some experienced feedback.
Thanks
In about 2 weeks time I will be in the exact position you are in. I plan to run my wiring first before installing any major interior components. Obviously it will help to have things like the ignition switch and maybe the heater box installed as well as speaker and wiper motor. Then you can route the wires however you need.
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Old 10-04-2020, 09:11 PM   #3
Peanut74
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Re: Wire loom question on installation

That is the way I am leaning. Basically work from the bottom of the dash out. IE install the wiper motor, heater and a/c box and speaker first. Then install the wire loom followed by the switches and such. Lastly the interior components.
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--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 10-04-2020, 10:44 PM   #4
Lee H
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Re: Wire loom question on installation

I ran the harness and taped the ends near where the component was to be installed. Then I installed the component and terminated the harness. Seemed to work OK.
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Old 10-05-2020, 09:49 PM   #5
un4gvn!
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Re: Wire loom question on installation

Install the dash pad first. You'll thank me in the morning.
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Old 10-05-2020, 10:57 PM   #6
Peanut74
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Re: Wire loom question on installation

Good point un4. It would truly be a PITA to it in after everything else. But on the other hand I've had to take everything else multiple times why should the dash be any different.
__________________
--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 04-17-2021, 09:13 PM   #7
Peanut74
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Re: Wire loom question on installation

Well I have graduated to working on the interior. Currently working on seats and the speaker box behind the seat. I did test fit the dash pad and like many others found that I needed to slot the holes some to get it to the right position on the front of the dash. Going to reinstall it tomorrow for the final time as I have already install the wiper motor. I also want to install the dash speaker with the speaker wires preinstalled. Once that is all installed I will have a better idea on how to run the wire loom.
__________________
--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 04-17-2021, 09:23 PM   #8
03BlkZ
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Re: Wire loom question on installation

Quote:
Originally Posted by Peanut74 View Post
Well I have graduated to working on the interior. Currently working on seats and the speaker box behind the seat. I did test fit the dash pad and like many others found that I needed to slot the holes some to get it to the right position on the front of the dash. Going to reinstall it tomorrow for the final time as I have already install the wiper motor. I also want to install the dash speaker with the speaker wires preinstalled. Once that is all installed I will have a better idea on how to run the wire loom.
I'm already done. I started with the dash kit then moved to the rear lights kit. I installed some components as I went. Then did the front light kit followed by the engine and did the starter/battery wiring last. I routed everything how I wanted it then put the harnesses in loom. I hooked the battery up last weekend and had a minor horn issue but that's it. Started the truck yesterday and everything seems to be functioning great.
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Old 04-18-2021, 09:16 AM   #9
Peanut74
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Re: Wire loom question on installation

03BlkZ, that is a nice looking truck. Did you find when you ran the loom in the cab that it was easier to run it on the firewall or the front of the dash? I did test the wiper circuit and it worked when I tested the wiper pump portion. The wiper part of the circuit didn't work when I tried it. I think it was the ground as I was doing the testing with the switch not installed in the dash. Just holding the ground to the switch and running power from the fuse block.

I have the chassis wiring all in place. However, wiring of the A/C is the last bit I need to do. Ordered the A/C unit but there is a four week lead time.
__________________
--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 04-18-2021, 10:34 AM   #10
03BlkZ
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Re: Wire loom question on installation

Quote:
Originally Posted by Peanut74 View Post
03BlkZ, that is a nice looking truck. Did you find when you ran the loom in the cab that it was easier to run it on the firewall or the front of the dash? I did test the wiper circuit and it worked when I tested the wiper pump portion. The wiper part of the circuit didn't work when I tried it. I think it was the ground as I was doing the testing with the switch not installed in the dash. Just holding the ground to the switch and running power from the fuse block.

I have the chassis wiring all in place. However, wiring of the A/C is the last bit I need to do. Ordered the A/C unit but there is a four week lead time.
I ran the wiring on the back side of the dash not the firewall. Also make sure to do all your chassis grounds. I may have gone overboard on grounds but I figured more opportunity for ground the better. I did a ground on both sides of the bed, both sides of the cab, both fenders and both sides of the radiator support as well ad two large ground stops from the block to the frame.
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Old 04-18-2021, 11:49 AM   #11
Getter-Done
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Re: Wire loom question on installation

Quote:
Originally Posted by Peanut74 View Post
Well I have graduated to working on the interior. Currently working on seats and the speaker box behind the seat. I did test fit the dash pad and like many others found that I needed to slot the holes some to get it to the right position on the front of the dash. Going to reinstall it tomorrow for the final time as I have already install the wiper motor. I also want to install the dash speaker with the speaker wires preinstalled. Once that is all installed I will have a better idea on how to run the wire loom.
Peanut74
Sounds like you have a good plan.
Are you making your own wiring harness or adding to a purchased harness?

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Old 04-19-2021, 09:26 AM   #12
BigBird05
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Re: Wire loom question on installation

03BlkZ, You have right idea of adding grounds to both L and R frame rails. With 50 + years of rust there is often a pour path for the ground between the L and R sides. These old trucks can't have 2 many grounds. With most of us running more accessories then in the 60's. I have added ground wires into the main harness for every electrical device and they all go back to the frame, battery, engine and the cab. All of the lights, fuel tank, blower motor and the dash have ground wires going to them.
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Old 04-19-2021, 06:09 PM   #13
Peanut74
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Re: Wire loom question on installation

Getter-Done, the PO installed a 28 circuit Painless wiring harness to replace the worn out one. It looked like a rats nest under the dash with all the wires balled up in there. After I took it out during tear down I realized that he did not cut any of the wires he did not use. He just kind of shoved them up under the dash. That was nice as I can add things and use the Painless harness directly and not add any wiring to the harness.

I am thinking I will need to wait on running the right door wiring until after the A/C unit is installed. I am hoping I can run that part of the loom up high under the front of the dash.
__________________
--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 04-25-2021, 08:10 AM   #14
Peanut74
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Re: Wire loom question on installation

Ok, I am routing my Painless wire loom to the right side door. But seem to be short as it only gets into the door bout 6" at best. Its suppose to be a harness specifically made for our pickups. This is before I put the A/C or glove box.

My question is has anyone else ran into this issue and how did you solve it.
Yes, I could solder in extra wire but before I did that I wanted to ask the question.
__________________
--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 04-29-2021, 10:15 PM   #15
Peanut74
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Re: Wire loom question on installation

Well I decided to run the loom on the top of the fresh air duct. Once I have my Vintage ac system I will know if I choose wisely
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__________________
--------------------------------------------------------
1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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Old 04-29-2021, 10:45 PM   #16
Getter-Done
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Re: Wire loom question on installation

That is looking Good

Attention to details pays off.











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84 Chevy K-20
63 Impala (my high school car)

http://67-72chevytrucks.com/vboard/s...Crew Cab Build

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Old 04-30-2021, 02:31 AM   #17
BigBird05
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Re: Wire loom question on installation

My experience with those press on wiring retainers is they don't last as long as you would like them to. Find a screw hole that you can use for a metal retainer.
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Old 05-03-2021, 07:33 PM   #18
Peanut74
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Re: Wire loom question on installation

Thanks Getter Done. To bad right after I took the pics I noticed that I forgot to put the washer pump wire in the loom. Had to open it up for about the hunderth time to put it in.

Big Bird I agree that the wire retainer sticky pads don't hold. The fix is put epoxy on the back side then stick it on. Son in-law worked at ARP and that is what they did on their race cars. Haven't had one come off since I started doing it that wY.
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1967 C10 "Snowball" (Currently in a million pieces down from a bazillion)
1989 Toyota DLX pickup "The Hulk"
2012 Jeep JKU "Crush"
1976 Chevy short bed with a 327 and 3 on the tree (Sold it to buy the Blazer)
1971 Chevy Blazer (Sold it)
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