Lights in the Cowl not working
Thread Starter
6th Gear
Joined: Jul 2016
Posts: 6
Likes: 0
Lights in the Cowl not working
I just purchased a '99 c5. None of the lights in the front cowl are working (park,marker or fog). The cowl has been repainted and I suspect maybe something has not been hooked up properly. I have checked the bulbs and they are fine. Any suggestions about how to troubleshoot the problem? THANKS!
Racer
Joined: Jul 2010
Posts: 391
Likes: 67
From: Oak Point Texas formerly okc
St. Jude Donor '16
I am out of town and don't have my books. However, those lights start with the lamp switch on the steering column. The marker and park lights have to be on before thr for lights come on. First check the appropriate fuse the see if there is power at the steering column light switch. I am an old novice at this but that is where I would start
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
I just purchased a '99 c5. None of the lights in the front cowl are working (park,marker or fog). The cowl has been repainted and I suspect maybe something has not been hooked up properly. I have checked the bulbs and they are fine. Any suggestions about how to troubleshoot the problem? THANKS!
Unless it was at Xtreme Kustomz in Shelby NC...
Last edited by 73Corvette; Jul 17, 2016 at 11:18 PM.
Thread Starter
6th Gear
Joined: Jul 2016
Posts: 6
Likes: 0
I just purchased a '99 c5. None of the lights in the front cowl are working (park,marker or fog). The cowl has been repainted and I suspect maybe something has not been hooked up properly. I have checked the bulbs and they are fine. Any suggestions about how to troubleshoot the problem? THANKS!
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
It sounds like they may not have connected G102 ground point or you have a problem with the splice packs that connect to G102. Check for 12VDC power at the lights when you have them tuned on, to a good ground. If you have that, then the lights aren't grounded.
SP100 - Splice Pack 100
Forward lamp harness, grounded to G102, at the RH headlamp opening door assembly connector breakout (CKT150)
SP102 - Splice Pack 102
Forward lamp jumper, taped to harness approximately 10.0 cm (3.9 in) left of C100. Grounded to G102.
G102
Forward lamp harness, on the top of the RH frame rail, behind the RH headlamp assembly, ground for SP100 (CKT250)
Look at the schematics. There are other things shown in the schematics that don't apply so just look at the items I listed.
SP100 - Splice Pack 100
Forward lamp harness, grounded to G102, at the RH headlamp opening door assembly connector breakout (CKT150)
SP102 - Splice Pack 102
Forward lamp jumper, taped to harness approximately 10.0 cm (3.9 in) left of C100. Grounded to G102.
G102
Forward lamp harness, on the top of the RH frame rail, behind the RH headlamp assembly, ground for SP100 (CKT250)
Look at the schematics. There are other things shown in the schematics that don't apply so just look at the items I listed.
Last edited by Greg_E; Jul 20, 2016 at 08:07 AM.
Thread Starter
6th Gear
Joined: Jul 2016
Posts: 6
Likes: 0
Thanks Greg_E for the great post! If I measure the voltage on one of the light sockets using the internal contacts for the bulb and get no voltage due to no ground. Can I then put the negative lead to a good ground and leave the positive lead on the bulb socket, should I then get 12v, or is there something else I would have to do to get 12v? Thanks again.
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Thanks Greg_E for the great post! If I measure the voltage on one of the light sockets using the internal contacts for the bulb and get no voltage due to no ground. Can I then put the negative lead to a good ground and leave the positive lead on the bulb socket, should I then get 12v, or is there something else I would have to do to get 12v? Thanks again.
The fog lamps only come on if you have the low beams or parking lights on and the fog lamp switch is on. New car for you, so I just want to make sure you knew that.
If the headlights are working and the rear parking lights and turn signal lights are working I don't think the multifunction switch is the problem.
I also assume you have checked all the appropriate fuses in under hood electrical center.
Post everything that does and doesn't work in the front. Hi beams Low Beams Headlight doors etc.
Last edited by Greg_E; Jul 20, 2016 at 10:44 AM.
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Thread Starter
6th Gear
Joined: Jul 2016
Posts: 6
Likes: 0
Which lights work...
All rear parking, brake and marker
Low and Hi beam headlight
Fog lamps
Which lights don't work...
L & R parking, marker and running lights
Tonight I tested the parking and turn signal lights with a vom. I did not get any voltage even using a good ground on the motor. I also checked continuity on the ground of the socket to motor ground... no continuity. So it looks like I don't have ground or positive to the socket.
What should I do next?
All rear parking, brake and marker
Low and Hi beam headlight
Fog lamps
Which lights don't work...
L & R parking, marker and running lights
Tonight I tested the parking and turn signal lights with a vom. I did not get any voltage even using a good ground on the motor. I also checked continuity on the ground of the socket to motor ground... no continuity. So it looks like I don't have ground or positive to the socket.
What should I do next?
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
I'm sorry I TOTALLY mis read your initial post... I thought you bought the car and had the dealership repair/paint your car then when you got it back it wasn't working properly...glad your getting help 
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Which lights work...
All rear parking, brake and marker
Low and Hi beam headlight
Fog lamps
Which lights don't work...
L & R parking, marker and running lights
Tonight I tested the parking and turn signal lights with a vom. I did not get any voltage even using a good ground on the motor. I also checked continuity on the ground of the socket to motor ground... no continuity. So it looks like I don't have ground or positive to the socket.
What should I do next?
All rear parking, brake and marker
Low and Hi beam headlight
Fog lamps
Which lights don't work...
L & R parking, marker and running lights
Tonight I tested the parking and turn signal lights with a vom. I did not get any voltage even using a good ground on the motor. I also checked continuity on the ground of the socket to motor ground... no continuity. So it looks like I don't have ground or positive to the socket.
What should I do next?
C100 (8 cavities)
Forward lamp harness to forward lamp jumper harness, RH skid bar in front of the horns.
Last edited by Greg_E; Jul 22, 2016 at 08:30 AM.