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1989 Chevrolet 3 4 Ton Pickups Base Fleetside 131.5

1989 Chevrolet 3 4 Ton Pickups
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May 9, 2012, 12:32 pm

Allen L
 

Question: Weird tail light issue


So...the lights were fine just a week ago. Then the turn signals started blinking once and no more. Then when I put on running lights there were no lights in the tail. Now..when I go into reverse the taillights (both of them in each circuit board) light up. The reverse light does not light up. It did work fine before.

Luckily I have another vehicle that uses the exact same "circuit boards" to hold the light bulbs. All circuit boards are working fine...so something in a switch or wiring has gone bad..I would guess.

What is my next step in troubleshooting.

In the past year I had to replace the light switch for the running lights and headlights. Things worked fine after that.

There is one green wire under the dash..hanging loose. No idea how long it has been loose.

Nothing "happened" or anything...the lights just started doing weird things.

Thanks for the help.

Allen


May 12, 2012, 8:42 am

Richard W
Expert Mechanic

Change turn signal switch. That should fix your problem.


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May 14, 2012, 5:39 am

Allen L
 

So...does the backup signal...the signal that turns on the white backup lights..go through the turn signal?? I had considered doing that switch but was unsure due to the backup light issue.

Any tips or tricks on changing the turn signal switch?? I would guess that you have to tear into the steering column. It's been a while since I have done that on any vehicle.


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May 15, 2012, 10:59 pm

Richard W
Expert Mechanic

The white bulb it the back up lights and they do not go through the turn signal switch. No real tricks on the replacement.


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August 15, 2012, 4:07 pm

Allen L
 

Thanks for all the help on this. It turned out to be a bad ground wire for the rear harness assembly. Once I found a break and hooked everything back up..everything worked normally.

On several vehicles and trailers lately..weird electrical things seem to have turned out to be bad grounds.

Again..thanks for the help


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