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Old 12-06-2009, 04:00 PM
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Big Electrical Problem

Alrighty, 1972 C20 Chevy. Ok my trucks passengers tail light won't work, it only works when I turn on the light here is what I have found out just messing with everything.

1. Doesn't come on when pushing in the break or turning on blinker.
2. It does come on when I turn on the lights but still will not blink.
3. When I flip the right blinker on you can hear it click but when I turn on the lights it stops clicking.
4. I'll turn the hazards on, everything still blinks but not the passenger side tail light, but when I turn the lights on everything stops blinking.
5. The back up lights won't come on when the lights are on or off.

I tried taking the passenger tail light out, everything looked fine, and I messed with it and pushed things back together just to make sure if they weren't connecting, but at one point it started to work then I put it all back together, then I flipped the blinker over to the driver side then flipped it back to the passenger side and it stopped working. So please help me!!!!

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Old 12-06-2009, 06:17 PM
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Do you have trailer wiring that is possibly goofed up? Second thing I would look at would be the turn signal switch. Did this problem just occur?

Vince
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Old 12-06-2009, 06:28 PM
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Well I didnt drive it for a while becuase we had to put a new distibutor in and then fix the u joints and then it started to do it but recently redid alot of body work and reall havent drove so it might have just started or it might have not and maybe I just didnt notice it but I think that it has always worked and it just started. Whats that trailer thing you were tlking about. O and my right license plate light won't come on either.
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Old 12-06-2009, 06:33 PM
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Usually when a wiring problem occurs at the rear it can be traced to faulty or bad trailer lights wiring.

Vince
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Old 12-06-2009, 06:58 PM
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sounds like the wires near the bulb socket are broken , it happens with the older models as thy see alot of movement back there from bouncing , see if your getting juice up to the leads near the socket ,you might have to pierce the insulation of the wire to check with a VOM , if you do cover the hole with some liquid tape so it won't corrode the wire later on.
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Old 12-06-2009, 08:34 PM
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Check your taillight grounds. Try attaching a test wire to a good ground and to the socket and try your lights.
Better yet, use a test light to check for power in the socket. Make sure your test light is hooked to a good ground, pull the bulb and test the socket contacts. Sometimes the contacts, which are spring loaded get worn or the spring weak and lose contact with the bulb.
You will see 2 contacts inside the socket. If you turn both the running lights and the turn signal on, one contact should have steady power the other should flash.
If you have both, then your problem should be either a bad ground or bulb/ contacts.
If you lack your flashing side, note the wire color and check that same wire where it comes right out of the turn signal switch.
If you have power at the switch, you likely have a broken wire between the switch and taillight. If you still dont have power out of the switch, then the switch is probably bad.
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Old 12-06-2009, 09:37 PM
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Ok Thanks for the help I'll try all these things and get back on here and tell you what I came up with.
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Old 12-07-2009, 05:22 PM
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Ok galaxieguy3 I tried what you said and I do have power going to the socket but only when I put the hazards on. The breaks do work but when I put the blinker on while I am pushing in the break it doesnt blink or stay a solid light. O and the blinker and hazards still stop when I turn on the lights.
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Old 12-08-2009, 04:24 AM
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Grounds, grounds and more grounds. Check all the grounds and make sure they are all good. Grounding problems are a big issue with lights and anything electrical. A bad ground can cause numerous problems.
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Old 12-08-2009, 09:18 AM
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1. Doesn't come on when pushing in the break or turning on blinker.
2. It does come on when I turn on the lights but still will not blink.

..........TWO separate functions not connected , sounds like a blown filament brake side of lamp .............

5. The back up lights won't come on when the lights are on or off.
.................. car must be in reverse for them to work ...............

I messed with it started to work then I put it all back together, then I flipped the blinker over to the driver side then flipped it back to the passenger side and it stopped working.

...................When the RH turn is selected wiggle the lever see if that changes anything ... note the brake lite is wired through the turn signal switch...This sounds like the signal switch itself is having problems.
Just some information how things work and a few suggestions as to where to look
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Old 12-08-2009, 04:51 PM
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5. The back up lights won't come on when the lights are on or off.
.................. car must be in reverse for them to work ...............

Yes I know that but I meant was that they don't come on when backing up even if the lights are on or off.
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Old 12-08-2009, 05:31 PM
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I would think either the socket, the wiring to it or the bulb.
I have seen bulbs shorted internally that cause weird issues.
Also check the ground and feeds for that side. If you moved it and it was ok for a while that should tell you the issue is most likely a connection or the bulb. I would start with a new bulb and take another look at the wiring and the socket
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Old 12-08-2009, 07:21 PM
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wiring diagram

Here's something that might help with this issue. My guess would be ground as well. Especially if bodywork was done, maybe someone took off a ground to take off a panel or something.
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Old 12-12-2009, 01:33 PM
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Ok I can still not figure this out. I put a brand new socket in and it works works for the hazards the breaks and the lights but not for the blinker, is there anything else I need to know to fix this.
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Old 12-12-2009, 02:53 PM
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This may sound kind of simple, but just making sure every base is covered. Is the bulb you put in there a new 2 filament bulb.
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