wiring harness differences

[Boog]

I have the 69 C10, originally a 6 cylinder 3 ott. The wiring on it was good.
I swapped in a 350/T350 and recently began hooking the wiring up and found some differences. I see the standard trans backup light switch was hooked into the trans. The 71 w/auto trans harness has the bkup switch/neutral safety switch located inside on the lower steering column.
One other difference I see is the wire harness across the radiator support has a couple of inline fuses in the 71 harness that my 69 harness does not have.
The schematics I have found here for 67-72 are different from what I have.
I do not intend to buy a new harness. This is just a driver.

[VetteVet]

........................................

Originally Posted by Boog

I have the 69 C10, originally a 6 cylinder 3 ott. The wiring on it was good.
I swapped in a 350/T350 and recently began hooking the wiring up and found some differences. I see the standard trans backup light switch was hooked into the trans. The 71 w/auto trans harness has the bkup switch/neutral safety switch located inside on the lower steering column.
One other difference I see is the wire harness across the radiator support has a couple of inline fuses in the 71 harness that my 69 harness does not have.
The schematics I have found here for 67-72 are different from what I have.
I do not intend to buy a new harness. This is just a driver.

Here is the ammeter fuses that I was talking about.



Here is the horn relay and neutral start switch. You can see the green backup wires and the purple starter wires that go to it.



and here are some wiring diagrams. The arrows are from other posts and point to various wires in the harness.

[Boog]

Thanks VV.
So i think all i need is to change out the engine part of the harness from the bulkhead and use my current gauge pack. If and when i should decide to change to the 7 gauge cluster i will need to change out the front harness so to include the fuses for the volt gauge. Does that sound right?

[VetteVet]

Originally Posted by Boog

Thanks VV.
So i think all i need is to change out the engine part of the harness from the bulkhead and use my current gauge pack. If and when i should decide to change to the 7 gauge cluster i will need to change out the front harness so to include the fuses for the volt gauge. Does that sound right?

Well it sounds like things are lining up for you. The engine harness is just about the same but when you go to change to the gauge cluster you'll have to make some changes. Mostly just swapping the wires around in the cluster plug and adding the two battery gauge wires like you said.

You'll want to do the popular mods like every body else so that will mean some added wiring or changing wires. We are on top of all of that so just ask away.

MERRY CHRISTMAS to you and yours.

[Boog]

Thanks Sarge.
And Merry Christmas to you too.

[Boog]

Something else Sarge.
The engine harness in those diagrams has 7 wires out of the bulkhead connector. My harness only has 5. One of those wires is a light green one. I found the reverse light switch wires inside by the fuse block so this wire is not for rev lights. In reading more threads I found this bit of info posted by Ray Mcavoy in post # 5 regarding that light green wire in the engine harness like mine.
http://67-72chevytrucks.com/vboard/s...d.php?t=589842
Now that wire does not appear in any of the diagrams I've seen. If it's for the TCS where does it go inside the cab?
If it won't hurt anything I'd like to use that wire to power my electric choke.