Brake lights dont work...?
Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Brake lights dont work...?
Ok all of a sudden my brake lights dont work. They blink left and right but the flashers dont work, they light up with the running lights but they dont get brighter when braking. What could this be? Sounds like a short to me....
Blinkers and running lights (1 filament works while headlights etc are on)
Flashers and braking doesnt work...
This is on my 74 btw
Blinkers and running lights (1 filament works while headlights etc are on)
Flashers and braking doesnt work...
This is on my 74 btw
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The brake lights and emergency flashers share the same fuse. Since these are the only things not working, check for power on BOTH sides of the fuse with a test light. Both sides should be hot at all times; I suspect you will only find one of them is hot. If that's the case, and there's no obvious signs of damaged wiring, replace the fuse. If it blows again, then we'll troubleshoot further. Fuses do get old and blow on their own.
Thread Starter
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Fleet Mechanic
Joined: Jun 2011
Posts: 1,804
Likes: 5
From: Southern California
Right, but the circuits feeding this common filament are different. One can fail while the others remain in operation.
The brake lights and emergency flashers share the same fuse. Since these are the only things not working, check for power on BOTH sides of the fuse with a test light. Both sides should be hot at all times; I suspect you will only find one of them is hot. If that's the case, and there's no obvious signs of damaged wiring, replace the fuse. If it blows again, then we'll troubleshoot further. Fuses do get old and blow on their own.
The brake lights and emergency flashers share the same fuse. Since these are the only things not working, check for power on BOTH sides of the fuse with a test light. Both sides should be hot at all times; I suspect you will only find one of them is hot. If that's the case, and there's no obvious signs of damaged wiring, replace the fuse. If it blows again, then we'll troubleshoot further. Fuses do get old and blow on their own.
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