Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
06-10-2020, 10:51 PM | #1 |
Registered User
Join Date: Aug 2005
Location: Southern California
Posts: 241
|
1978 c10 firewall bulkhead wiring questions
Back when I pulled the big block out of this truck I thought I would remember everything and figured the LS would be going in, in a couple months. Well here we are 2 years later and Im just barely doing the wiring on it, of course I didn't label anything. Can y'all help me out with this? Starting at the bottom of the bulkhead I have a tan and a dark blue wire, do I still need these for my 5.3 4L60E swap? Going up next I have a brown wire that use to go to the alternator, do I still need it? Directly to the left wire I have a heavier gauge red wire that use to go to the alternator. Next I have a purple wire, pretty sure that's going to go to the 5.3 starter. Directly to the right of that I have a light blue wire almost see through, not sure what that one is for? And the last one is a heavier gauge white wire, looks like it was feeding the distributor or coil, can I use this for 12 volts ignition source? Any help greatly appreciated.
|
06-10-2020, 10:54 PM | #2 |
Registered User
Join Date: Aug 2005
Location: Southern California
Posts: 241
|
Re: 1978 c10 firewall bulkhead wiring questions
Here are some pictures
|
06-12-2020, 09:43 AM | #3 |
Registered User
Join Date: Sep 2018
Location: Hampden, ME
Posts: 408
|
Re: 1978 c10 firewall bulkhead wiring questions
I wrote up a thread on how I hooked up my PSI Wiring harness - it would technically apply to any LS harness pretty much.
Thread is here http://67-72chevytrucks.com/vboard/s...d.php?t=797509 I also attached an image that explains what each wire needs. The one that has power on crank is what I fed switched power to my PCM and fuel pump from - that way the PCM and fuel pump has power while the engine is cranking. This wire in the bulkhead used to feed the coil/distributor. I used the battery cables from my donor vehicle, and I didn't care about having the battery light on the dash, so I didn't need the bulkhead alternator connector. Hopefully thats helpful or at least gets a start! |
06-13-2020, 02:04 PM | #4 |
Registered User
Join Date: Aug 2005
Location: Southern California
Posts: 241
|
Re: 1978 c10 firewall bulkhead wiring questions
It sure does help Eric, thank you brother.
|
Bookmarks |
|
|