Rear Tail Lights Are Possesed

[Coasty]

I bought my truck recently and the guy I bought it from had installed an aftermarket rear bumper and splice the license plate light wiring for with the wire taps into what he thought was the marker lights but was in fact the blinkers. The rear blinkers weren't working and the front ones were flashing really fast like they do when you have a burned out bulb. When I cut the wire for the license plate light and removed the wire taps the front blinkers work normally but the blinkers and emergency flashers on the rear lights are all messed up. When I turn on the left signal the top 2 lights on the left rear taillight flash dimly while the top one on the right flashes dimly as well. When I turn on the right the top and bottom lights on the right taillight flash dimly.

 

Obviously the wiring on the rear taillights needs to be sorted out, does anyone have a wiring diagram for the rear tail lights? I may have to run out and buy either a chevy manual or a haynes (as much as I don't like them) to sort this one out.

 

Thanks in advance,

Patrick

[JoJoJim]

I thought this might help even not exactly what you requested. It does give you a clear picture of the color coding of what goes where.

[sonjaab]

Also note that the rear taillights each have a circuit board thing

attached to the back of each taillight. One or both could be bad.

[Diesail]

Can't help with a diagram but it soulds like you have no ground to the flashers.

[Kodiak450]

Also note that the rear taillights each have a circuit board thing

attached to the back of each taillight. One or both could be bad.

 

 

Where? Embedded deep inside the tail lens? I don't recall seeing one when changing the bulbs, then again al I did was change bulbs, ddin't examine further inside the lens.

[Coasty]

Mine does'nt have a circuit for each light, just wires running up to them but mine is a strip down model so that may be why. There are 2 boxes above the spare tire that the wires come from but everything is as it should be with regards to those. I don't have a trailer wiring harness so I can't use that for troubleshooting unfortunately.

 

All the research I've done I've come to the conclusion that I may have a bad LCM (light control module) as all the brake lights work normally, it's just as the signals are messed up. I read that the LCM controls routing of the turn signals and its solved similar issues for others so I"m going to roll $30 and pick one up at Napa then I'll let everyone know whether it was money well spent or just money spent.

 

Thanks for the help.

[Coasty]

Mine does'nt have a circuit for each light, just wires running up to them but mine is a strip down model so that may be why. There are 2 boxes above the spare tire that the wires come from but everything is as it should be with regards to those. I don't have a trailer wiring harness so I can't use that for troubleshooting unfortunately.

 

All the research I've done I've come to the conclusion that I may have a bad LCM (light control module) as all the brake lights work normally, it's just as the signals are messed up. I read that the LCM controls routing of the turn signals and its solved similar issues for others so I"m going to roll $30 and pick one up at Napa then I'll let everyone know whether it was money well spent or just money spent.

 

Thanks for the help.

It was money spent, I still have the issues. I"m going to tear into it tomorrow in the shop as it's snowing outside right now. This is getting FUN!!!!!

[sonjaab]

Some/most years have them mounted to the back/outside of the light body.

When they fail (often) the lights do screwy things!

http://www.car-stuff.com/mmparts/chevy-sil...tail_light.html

[Kodiak450]

Some/most years have them mounted to the back/outside of the light body.

When they fail (often) the lights do screwy things!

http://www.car-stuff.com/mmparts/chevy-sil...tail_light.html

 

Yea I think I recall seeing that in the tail lights. So I guess having this would make it kinda hard for those after market euro tail lights (which my local parts store owner) has and keeps offering me a great deal on them. Only thing that stops me is there is no room in those aftermarket lights for the hidden strobes.

[Coasty]

Some/most years have them mounted to the back/outside of the light body.

When they fail (often) the lights do screwy things!

http://www.car-stuff.com/mmparts/chevy-sil...tail_light.html

 

Yup, that was it. It didn't go bad but the sockets but were very funky so I removed them, cleaned them and put in dielectric grease to prevent the return of the funk. Works great now. Thanks for the help.