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Old 06-01-2010, 05:09 PM   #1
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Question Towing Electric problem

Another puzzler for the info geeks out there.

I have no right side brake light on the coach. I do have marker, turn signal and four ways. The same wire handles the brake and turn signal activation. No problem with the TV brake lights. No problems with the left side .

Any suggestions on where to start ? I rather not start tearing apart wires on the TV. It is factory tow setup so there is no splices.

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Old 06-01-2010, 05:58 PM   #2
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If you have a volt meter or test light, check all the terminals at the truck 7 pin connector and see if the problem is present there, too.

In the factory wiring, the brake and turn signal voltage are grabbed up under the dashboard somewhere, not at or near the lights themselves as in an aftermarket install. So what you see looking at the back of the truck may not be what is present or absent at the 7 pin connector.

Does your truck have separate brake and turn signal fixtures? There may be a problem in the magic box that converts 4 way to 3 way wiring.

In the trailer, there 3 single wires from the 7 pin to the lights, one for left stop/turn and one for right stop/turn and one for parking/running lights. If the turn signal works properly on the TT and the brake does not, then the stop voltage is not getting to the 7 pin connector.

Based on your report, the turn signal is performing normally? It is full strength and proper flash rate? If it is dimmer than it should be, then there may be a bad ground. But that is separate from the problem you're reporting.
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Old 06-02-2010, 07:37 AM   #3
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Quick check shows that the 1500 has separate turn and brake lamps.

The fact that it lights with the turn signal shows that the wiring, socket, and bulb are intact and working from the 7 way connect back, so that eliminates the trailer.

Therefore it's something on the TV - most likely, as mentioned, the "magic box" or whatever the equivalent is on the TV.
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Old 06-07-2010, 06:46 AM   #4
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My Dodge has seperate fuses under the hood for trailer stop lamps, and trailer signals (left and right). Maybe you have a blown fuse.
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Old 06-27-2010, 11:47 AM   #5
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Well, I found out what the problem was. Modern electronics is not just wiring anymore. A little 3 inch plastic box with connecters sticking out of it. A turn signal modual. At a $100 bucks worth! Plus labor ! What ever happened to being able to repair stuff yourself?

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