1984 Chevy 1500 Diesel - No left turn signal

[p38fln]

This thing gets used as a plow truck and rarely sees the road - still would be nice if all the flashing lights worked.

The front two turn signals flash when they're supposed to, the rear right one does also. The left rear signal doesn't flash, and it doesn't come on with the brake lights, but the tail lamp works.

We tried changing the bulb, changing the trailer harness breakout T, changing the turn signal switch in the steering wheel, and replacing some module underneath the steering wheel that all the turn signal wires go through, and still nothing.

Any ideas? Won't be working on it again until the weather warms up, but I like all the required lights to work.

 

[Fargo Wolf]

Check the wiring. Something is either not hooked up, or is wired in wrong. I'll ask a friend, as she knows GM/Chevy really well (Does all her own wrenching too, I'll add).

 

[Fargo Wolf]

Got a reply from my friend. She says to replace the "pig tail" that the bulb fits into.

 

[p38fln]

It had no turn signal or left brake light at the trailer connection also, so we removed the 4 way and use a test light to see if there was anything there. Absolutly nothing coming from the cab of the truck.

We're thinking its somewhere between the module that splits the front and rear signals and the firewall of the cab now. Couldn't find anything at the junction box on the front side of the cab, either.

 

[SPARKEY83]

there is a group of wires that come out of the firewall near the booster and wiper motor thet run to the rear lights, there is a shar bend and the wires tend to seperate inside the plastic. had the same problem with my K5 and thats where the problem was.