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Old 05-24-2022, 01:43 PM   #1
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Tail light wiring question

I have stick-on tail lights, using a blue ox 7 pin to 6 cable, 6 pin on the toad side is wired to a battery charger with LED's and to a four-flat trailer light setup.

Here's the behavior:
  1. Battery charger works (LED shows "charging")
  2. Only the right brake light comes on.
  3. Only the right running light comes on.
  4. Right turn signal works.
  5. Left turn signal doesn't work.

Double checked the wiring on the 6 pin connector, looked right to me.

Hypothesizing it was a bad tail light, I swapped the green and yellow wires at the 6 pin connector.
  1. Only the right brake light comes on.
  2. When I signal left, the right light flashes
  3. When I signal right .... the right side light flashes.

Not to prejudice your response, but the wiring was run by the guy who very cleverly screwed up the installation of a brake switch disconnect I didn't need, essentially bypassing the brake switch so that when the "disconnnect" was active, the brake lights were on continuously. Whatever he did to the tail lights seems to have been even more clever, I'm having a hard time figuring it out.

I am taking it back in, although this is kind of a head scratcher and I'm hoping you guys could give me some ammunition

My current theory is, the right tail light isn't grounded, suspect he has the yellow wire connected where the right hand ground is supposed to be. Regardless, have I established that the wiring is screwed up somewhere between the six pin connector and the tail lights?
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Old 05-24-2022, 02:19 PM   #2
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Just unhook all the wires and do it over correctly. Make sure you have a good ground between toad and motorhome, bad grounds can cause many strange things to happen to lights.
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Old 05-24-2022, 02:32 PM   #3
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The installer isn't "clever"

He's an idiot! take it somewhere else or do it yourself.
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Old 05-24-2022, 03:32 PM   #4
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Is there a good ground between the coach and the toad. Take a set of jumper cables and use just one cable, attaching to the coach frame and the toad frame and see if the lights work properly.
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Old 05-27-2022, 06:45 PM   #5
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Quote:
Originally Posted by TampaDave View Post
I have stick-on tail lights, using a blue ox 7 pin to 6 cable, 6 pin on the toad side is wired to a battery charger with LED's and to a four-flat trailer light setup.

Here's the behavior:
  1. Battery charger works (LED shows "charging")
  2. Only the right brake light comes on.
  3. Only the right running light comes on.
  4. Right turn signal works.
  5. Left turn signal doesn't work.

Double checked the wiring on the 6 pin connector, looked right to me.

Hypothesizing it was a bad tail light, I swapped the green and yellow wires at the 6 pin connector.
  1. Only the right brake light comes on.
  2. When I signal left, the right light flashes
  3. When I signal right .... the right side light flashes.

Not to prejudice your response, but the wiring was run by the guy who very cleverly screwed up the installation of a brake switch disconnect I didn't need, essentially bypassing the brake switch so that when the "disconnnect" was active, the brake lights were on continuously. Whatever he did to the tail lights seems to have been even more clever, I'm having a hard time figuring it out.

I am taking it back in, although this is kind of a head scratcher and I'm hoping you guys could give me some ammunition

My current theory is, the right tail light isn't grounded, suspect he has the yellow wire connected where the right hand ground is supposed to be. Regardless, have I established that the wiring is screwed up somewhere between the six pin connector and the tail lights?
I have done so many of these type of wiring scenarios, I canít count them all. To be truthful, probably half that Iíve done, I had something done backward. Itís very easy to wire something up wrong and have to correct it.

As was suggested, your tech or you just needs to start from scratch and do it again.
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