Multiple Turn Signal Issues

[88 Pioneer 4.0]

I have an 88 Comanche 4.0 Litre and I'm having multiple turn signal issues. With the headlights on the only signal that works properly is the Right Rear. With the headlights off both rear signals work properly, but the front signals do not. Headlights off results in either both front signals blinking or neither front signal blinking. I attached a table that provides the various scenarios. I don't know if I should start by replacing the turn signal arm on the steering column, or replace the bulb sockets and/or wiring first. Suggestions for how to approach this would be greatly appreciated.

[JMO413]

Front bulb sockets would be my start for sure. They are know to be an issue. The ground tab in the socket is usually the issue. You will also want to check the ground at the rear for the taillights.

 

http://cruiser54.com

I would also highly recommend reading though the attached site also.

 

You will also get more replies if we know what year and such. See the link below.

 

[Eagle]

All those symptoms indicate that the turn signal sockets don't have a good ground, and are trying to ground by backfeeding through parking light circuit.

 

[88 Pioneer 4.0]

Thanks for all the feedback! I've updated my signature to include MJ details and I'll let you know if replacing the front sockets works.

I've been ordering my parts from am-autoparts.com. Is there another site that is good or better for finding parts for my 88?

[billyblankss]

I have this exact problem right now when the lights are on. I assumed it was a ground that was bad based on all the ground issues this truck is known to have. You may not need to buy new sockets, just trace the grounds from each of the sockets and make a better ground. That's what i'm going to try - will update you. 

[88 Pioneer 4.0]

Mine was a grounding issue, but I found that the break in the ground was within the socket. Replaced both sockets and fixed the problem. Dorman 85898 socket fit my 88 Pioneer. $10 each at O’Reilly.

[billyblankss]

Nice. I figured out yesterday that by cleaning the lighting harness connector (as i saw in cruisers tips) it solved the issue. I used contact cleaner and dielectric grease. If it starts pooping out on me again i will get the new connector.