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Old 07-07-2013, 03:58 PM   #1
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3rd Brake Light Assistance needed

Hi folks,

I discovered over the weekend that my 3rd brake light wasn't working. I looked around inside the engine compartment and discovered that the wire leading to the brake light was cut in two. I wired the wires back together, but the lights still were not illuminating.

Using my test light, I have determined that each bulb socket is getting juice, but the lights aren't illuminating.

I'm not an electrical genius, but shouldn't there be a ground wire leading back into the engine compartment? I don't see anywhere in the bulb socket wiring that a wire connection is missing.

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Old 07-07-2013, 04:01 PM   #2
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These go bad and have to be replaced. You can get a replacement on Ebay or Factory replacement form a dealer. Remember nowadays things are made not to last.haha
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Old 07-07-2013, 04:42 PM   #3
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A simple test would be to run temporary power AND ground wires to your light. If the light works, the problem is obviously the ground circuit.
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Old 07-07-2013, 05:32 PM   #4
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Quote:
Originally Posted by USMCRET View Post
Hi folks,

I discovered over the weekend that my 3rd brake light wasn't working. I looked around inside the engine compartment and discovered that the wire leading to the brake light was cut in two. I wired the wires back together, but the lights still were not illuminating.

Using my test light, I have determined that each bulb socket is getting juice, but the lights aren't illuminating.

I'm not an electrical genius, but shouldn't there be a ground wire leading back into the engine compartment? I don't see anywhere in the bulb socket wiring that a wire connection is missing.

The photo shows the lights hanging by a single wire - let's assume that wire is the +12V line. It feeds each of the sockets, as it should. Each socket also has a second wire, and they are all tied together as well. That will be the ground connection. Since that connection does not have a broken wire attached to it I assume that the coach manufacturer relied on the light housing itself to supply the ground. That means that the sockets must be mounted in a metal frame, not plastic. That metal frame will have a wire that will be attached to the chassis somewhere nearby. If the bulb sockets plug into a plastic frame in the light fixture, then there is a wire missing - just take those wires that connect the 3 sockets together and run a new wire to the chassis and the lights should work.
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