1999 Firebird Lighting
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Joined: Mar 2014
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From: Indiana
1999 Firebird Lighting Not sure where i should have posted this so i am posting it here, Anyways my tail lights and brake lights work just fine during the day. At night when i turn my headlights on everything still works except when i hit my brakes my tail lights barely get brighter. You almost cant even tell i hit the brakes. Any ideas on what this could be?
UPDATE:::: it was a blown 5amp fuse listed under IP Dimmer. thanks everyone.
this also fixed my now working cluster lights.
UPDATE:::: it was a blown 5amp fuse listed under IP Dimmer. thanks everyone.
this also fixed my now working cluster lights.
Last edited by Jrclayton; Mar 11, 2014 at 10:10 AM. Reason: updated
Likely a corroded ground or high resistance in the wiring.
Backprobe the brown wire at the stop lamp connector and supply it a good ground. Step on the brake. If you've got 11.5 to 12ish volts your voltage supply is good if not then you've got a high resistance in the power wire and you'll need to find the spot. If it's good then back probe the brown wire and blk wire and the connector. If it's low you'll need to look at ground G400. Clean the ground. If that doesn't do anything then follow the black wire to it's splice point S410 and redo the splice.
If you hate wiring bring it to a shop.
Backprobe the brown wire at the stop lamp connector and supply it a good ground. Step on the brake. If you've got 11.5 to 12ish volts your voltage supply is good if not then you've got a high resistance in the power wire and you'll need to find the spot. If it's good then back probe the brown wire and blk wire and the connector. If it's low you'll need to look at ground G400. Clean the ground. If that doesn't do anything then follow the black wire to it's splice point S410 and redo the splice.
If you hate wiring bring it to a shop.
Last edited by tryintogofast; Mar 6, 2014 at 04:54 PM. Reason: Further explaination
Joined: Nov 2003
Posts: 11,328
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
Likely a corroded ground or high resistance in the wiring.
Backprobe the brown wire at the stop lamp connector and supply it a good ground. Step on the brake. If you've got 11.5 to 12ish volts your voltage supply is good if not then you've got a high resistance in the power wire and you'll need to find the spot. If it's good then back probe the brown wire and blk wire and the connector. If it's low you'll need to look at ground G400. Clean the ground. If that doesn't do anything then follow the black wire to it's splice point S410 and redo the splice.
If you hate wiring bring it to a shop.
Backprobe the brown wire at the stop lamp connector and supply it a good ground. Step on the brake. If you've got 11.5 to 12ish volts your voltage supply is good if not then you've got a high resistance in the power wire and you'll need to find the spot. If it's good then back probe the brown wire and blk wire and the connector. If it's low you'll need to look at ground G400. Clean the ground. If that doesn't do anything then follow the black wire to it's splice point S410 and redo the splice.
If you hate wiring bring it to a shop.
Oh, and when he says "back probe the brown wire" he means using a test light or multimeter. Don't just give the brown wire a "good ground" - you'll short the tail lamps circuit and blow the fuse.
