wiring harness for 94 IDI

[bowhunter13]

looking for some help on wiring harness for brake lights and turnsignals .


mine will not work and im lost.

 

[crash-harris]

Do what I did with Bruiser. Go find the same era (92-96 for you) truck at the junkyard and cut the harness out as far back as you can and spice it into yours.

 

[IDIoit]

check your grounds before you go any further.

 

[bowhunter13]

not sure i need to go that far, the harness i see looks great, i just need to know the color codes to ohm everything out and find the issue. I am sure it is something stuipd and simple.. im just pulling my hair out trying to find it.

 

[IDIoit]

also may want to disconnect rear harness from firewall, use electrical contact cleaner and a vast amount of dialectic grease.

 

[rwk]

po of our 93 had spliced in the brake light switch plug for trailer lights, it had shorted and melted down, check under dash for non stock wires, get a 12 volt test light if you dont already have, our light switch had been changed also, new plug was spliced in, 1 bad butt splice was causing intermittent running lights, takes time and patients to track it all down,good luck

 

[crash-harris]

Here ya go

You must be registered for see images attach

Pic was too big to upload via the forum.

 

[bowhunter13]

I just go turnsignals to work... Had to push in the hazzard button and replaced the fuse. there was power in an out of the fuse but when i put new on it ,, it worked. NOT sure
I have no hazzards but im ok with that.

brake light nly comes on over cab. Still lost on that.. Yes i change all the fuses now.

on the drivers side frame the brake lines come into a regulator of sorts. there are 4 wires to that and they got to rear of truck. i have NO power at that connection .
I do have power at the booster and that harness that runs off that.

 

[DaveBen]

I would look for damage to the harness along the frame, from the cab to the taillights.

Dave

 

[crash-harris]

That is your ABS valve.

 

[bowhunter13]

That is your ABS valve.

should there be power there when u push brake?

 

[crash-harris]

I couldn't tell ya, but someone else should chime in soon that can. I think that at least one pin should be hot with the key on, but the valve doesn't do anything until the drums start to lock anyway.

 

[79jasper]

I would think the RABS computer at least sees brake signal. But I don't know if it travels through it.

Sent from my SAMSUNG-SM-G935A using Tapatalk

 

[madpogue]

RABS has NOTHING to do with the brake lights. It's tied to the VSS.

Work at this level requires an EVTM. Otherwise you're beg/borrow/stealing diagram here, diagram there, someone's recollection of a wire color over there. At the very least, you'll want to check all the appropriate terminal combinations at the signal/hazard switch, with each position of the switch.