Topic: Electrical problem
in Forum: C3 Electrical
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I am having a problem with my brake lights, turn lights, etc working properly. It is apparent to me there is a serious electrical issue. Is there any easy way to begin troubleshooting and where do I begin! Thank you very much for all of your help.

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First thought ,a short in the tail light harness,you didn't mention whether the parking lights worked or not,2nd choice ,the turn signal switch.3rd choice,bad bulbs or sockets corroded

C3VR Lifetime Member #93
Could you be more specific with regard to symptoms? It would make it somewhat easier to tell you where to start.
It could be a harness issue in the column, wire runs to the four corners of the vehicle, potentially a bad bulb or bulbs or various other issues.
It could be a harness issue in the column, wire runs to the four corners of the vehicle, potentially a bad bulb or bulbs or various other issues.

Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
not enough info as the others stated to even begin to tell you.
LIFETIME MEMBER #97
THE DYNAMIC DUO
THE DYNAMIC DUO


Moderator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Yes...need more data, preeze!
What exactly is NOT working? There can be(and usually are) many different things that cause brake/turn sig failures, but we need to know what kind of malfunction it is in order to point you in the right direction.

What exactly is NOT working? There can be(and usually are) many different things that cause brake/turn sig failures, but we need to know what kind of malfunction it is in order to point you in the right direction.

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Sorry for being so vague earlier. I took a closer look and I have found the following:
1. The Left rear tailight is not working when headlights are on
2. Front running lights (in grill) not working when headlights on
3. Rear tailights and all other lights on car (including side markers, front running lights in grill are not working when the headlight switch is pulled only half way out.
4. When headlights are up and on, the two inner front headlights are not working
5. Right side turn signal is working but not the left side.
6. The turn signal switch will not automatically disengage after making turns (believe the cancelling cam needs to be replaced, correct me if I am wrong.
I also noticed that when I play with the wires at the brake light bulb it flickers. I am assuming that this means I have a short. I put new bulbs in so I am sure they work but am still having problems with the turn signals. This probably is an issue with the turn signal wiring harness on the column, correct?
Thanks again for all of your help, I appreciate it!
1. The Left rear tailight is not working when headlights are on
2. Front running lights (in grill) not working when headlights on
3. Rear tailights and all other lights on car (including side markers, front running lights in grill are not working when the headlight switch is pulled only half way out.
4. When headlights are up and on, the two inner front headlights are not working
5. Right side turn signal is working but not the left side.
6. The turn signal switch will not automatically disengage after making turns (believe the cancelling cam needs to be replaced, correct me if I am wrong.
I also noticed that when I play with the wires at the brake light bulb it flickers. I am assuming that this means I have a short. I put new bulbs in so I am sure they work but am still having problems with the turn signals. This probably is an issue with the turn signal wiring harness on the column, correct?
Thanks again for all of your help, I appreciate it!
Sounds like you have dirty connections everywhere. One bad earth can cause a multitude of problems and if you get a flickering bulb when you play with the wiring it lends me to believe a lot may just be very dirty.
You're correct about the non-cancelling turn signal switch, I had the same problem and fitted a brand new one which is easy as long as you take you're time and remember to be really careful when taking the steering wheel assy apart as there is a lot under spring tension in that area.
Your inner head lamps will only come on when you are on high beam.
If your light switch feels loose and sloppy you may even have a dud switch assy but because your right rear tail light is working(?) the switch may be ok.
Have fun. Plastic cars need everything earthed to the frame!

Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
best thing to do is use a test light. find a good ground and check each
wire. if your light lights up when you check the hot wire to the lights
then i would assume you have bad grounds. if they don't light up the
test light i would go the the lightswitch and trace from there.
LIFETIME MEMBER #97
THE DYNAMIC DUO
THE DYNAMIC DUO


Moderator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
I'll suggest checking the bulb sockets themselves, as far as the park/tail lights/turn sigs not working. The grounds for the sockets can become corroded on the inside of the plastic, and be a pain to find the problem. Try touching a ground wire to each socket(*) individually with the lights on, and see if that bulb lights when grounded.
It really sounds like you have a massive loss of ground connections just about everywhere...
Chances are, tho, with almost ALL of the lights not working, the sockets are corroded internally...
* What I meant by that is, touch the grounding wire to the actual BULB shell(the goldish part) to see if the bulb lights...
Just a spare section of electrical wire, maybe 2 ft long, and ground one end of it to the chassis. Then use the other end as a "test" ground...
Adams' Apple 2007-05-22 18:38:24
It really sounds like you have a massive loss of ground connections just about everywhere...

* What I meant by that is, touch the grounding wire to the actual BULB shell(the goldish part) to see if the bulb lights...
Just a spare section of electrical wire, maybe 2 ft long, and ground one end of it to the chassis. Then use the other end as a "test" ground...

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Electrical
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