Help! Wiring gurus needed

[Doug]

So I've been trying to track down a short in my system for a while, and narrowed it down finally. Once in a while my truck stops running, and the ECM1 fuse is blown, I'd replace the fuse, and as soon as key is turned, pop, fuse blows again. Before today every time i'd have it towed home and by the time i got home, whatever was shorted wasn't shorting anymore, so i had nothing to track down. Today it did it right outside my house as i was pulling out of driveway, i had a pile of fuses, so i started unplugging stuff til it stopped blowing them. Unplugged all 3 connectors to the ecm and it's still blowing the fuse, so i start unplugging other stuff til it stops blowing. Voila, this connector seems to be the culprit.

I need someone who can tell me what this connector is, and what some specific wires go to, i'm having a hard time tracking it down in the wiring diagrams i have.

Here is the connector:
https://drive.google.com/file/d/0By0wih6ZT4QIV3piNlZRNnFCUzA/edit?usp=sharing

I get my multimeter and check which pins on each side are currently grounded, not sure which if any are SUPPOSED to be grounded, but i found 4.

In this side as pictured, the top orange pin (orange with black stripe wire) is grounded, as well as the 2nd pin from the left on the bottom(i think it's grey?)

https://drive.google.com/file/d/0By0wih6ZT4QIeV9Ebk42YmZSUFk/edit?usp=sharing

on this side of the connector, the 2nd from the right on top as pictured(pink with black stripe i think) and the 2nd from right on bottom(green i think? sorry, i'm very colorblind >_<)

https://drive.google.com/file/d/0By0wih6ZT4QILWNhZXZyQ1BDN3c/edit?usp=sharing


I'd really love to be able to drive my truck asap, so any help or ideas would be amazing!

thanks in advance!
-Doug

 

[Doug]

Re: Help! Wiring gurus needed

ok, i think i found it on the diagram, looks like the pink with black wire is the culprit, and it goes a bunch of places, i guess i have to start unplugging stuff and tracing wires, unless anyone has another idea.

 

[Doug]

Re: Help! Wiring gurus needed

actually, looking at where it goes, if i have an aem boost controller, and turbo tweak chip, and egr removed, is there anything that pink wire goes to i really care about?

scratch that, i guess fuel injectors are important

 

[0966Sy]

I would start by eliminating circuits powered by the fuse. Your links are not working for me, if you have the syty gm service manual book you should be able to figure it out. Start checking continuity to ground on isolated circuits till you find your circuit with the fault.

 

[cloneman315]

Re: Help! Wiring gurus needed

try unplugging the oil pressure sender

 

[canadian]

Re: Help! Wiring gurus needed

Can't seem to see any of the pictures. I get an access denied error.

 

[Syclone#2960]

Re: Help! Wiring gurus needed

on the 1st pic...one of those white wires goes to the speed tach.

Guys have to click on the arrow to download the pics.

 

[Doug]

Re: Help! Wiring gurus needed

ok, pretty sure it's the pink wire with the black stripe that goes into the firewall, but i can't figure out what is causing the short.

so far what i've done troubleshooting, disconnect that connector, get multimeter and set to continuity testing, ground one side, connect other to pink wire with black stripe, multimeter is beeping as there is no resistance between ground and wire.(is my logic sound? that wire should not be grounded right?)

so far i've removed my egr system entirely, just the connector left. also disconnected the injector harness, still beeping, so i know it's not that. also disconnected IC pump relay. Too dark not to do any more investigation tonight.

 

[leadfoot]

Re: Help! Wiring gurus needed

Don't waste your time with the O2's.

Inspect:

1. Boost relay and wastegate solenoid. (uses 439 pnk/blk)
2. CAC pump relay. (uses 439 pnk/blk)

Both go to ECM1 fuse.

Your injector power is from the 439 pnk/blk wire coming out of the 24 pin connector (BA6) ignition feed, HOWEVER it goes through ECM fuse (not ECM1 fuse) ((unless typo in schematic?) and links to the EVRV solenoid.

The common denominator is that 439 pnk/blk all go to the ignition switch. Check under steering column too.

Source: 1992 GMC Truck Syclone V6-262 4.3L Turbo ALLDATA

Good luck

:tup:

 

[Doug]

Re: Help! Wiring gurus needed

thank god, finally found it, the plastic cover thing came off a section of the wiring harness(right where the injector harness breaks out) and a wire was shorting on the eye hook thing on the back of the engine. wrapped wire that was shorting in electrical tape and recovered with teh plastic cover and wrapped that in tape as well. Hopefully will be good til i have time and resources to do it correctly. Thanks all! so great to have my truck back running