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Old 07-29-2012, 01:33 PM   #1
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Trailer lights not working correctly

I just installed a 4 pin plug connector on my car and then installed a new lighting kit on my trailer.

With the running lights off the turn signals on the trailer work fine, however the brake lights don't work.

When I turn my running lights on and attempt to use the turn signal, both trailer lights blink.

I have double checked the ground on both plugs and it seems to be fine.

The plug on my car has LED indicators for left turn, right turn, and running lights.
When the running lights are on the turn indicators are not lighting up so this leads me to believe that the issue is on the car end.

I looked at the wiring and it appears to be in order. What can I do to pinpoint the issue?
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Old 07-29-2012, 02:20 PM   #2
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This sounds like a bad ground, make sure where you attached the ground to the trailer and ground to vehicle that it is clean (like no paint under it). You will want to do this at the lights as well, if they are self grounding (no ground wire) make sure the bolt that the ground comes thru is clean metal under it, if they get their ground thru a wire make sure its clean under the connection.
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Old 07-29-2012, 02:37 PM   #3
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Are the running lights, turn signal and the brake lights on the car the same lights. You might need a five wire to four wire adapter to make the TT lights work properly.
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Old 07-29-2012, 03:08 PM   #4
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it would help knowing what car you have and what kind of RV you're talking about(brand/model).
the only RVs that use a 4-pin connector are popups.
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Old 07-29-2012, 03:11 PM   #5
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What are your towing using a flat 4 connector? The camper doesn' have brakes?

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Old 07-29-2012, 05:08 PM   #6
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The car is a 98 Suzuki Swift and I'm just towing a very small trailer for pulling around a canoe or a kayak.

The trailer doesn't have brakes.

Can I test to see if the ground is good using my volt-meter?


Here's what I've got going on:
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Old 07-29-2012, 07:03 PM   #7
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Update: Got it working. I was spliced into the wrong line going into the running light/brake light. Oddly enough the running lights indicator now doesn't light up though.
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Old 07-29-2012, 07:12 PM   #8
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Because the running lights and the brake lights are not the same socket you will need to get a 4 way converter that will allow you to use the four plug system. The cost in Canada for the part to fit you vehicle is $29.99. You need to visit you local auto parts store and tell them what you are trying to do.
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