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Old 08-12-2016, 10:22 PM   #1
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Trailer brake lights issue

Hello everyone. As i start digging into this older trailer i find odd things wrong here and there. this trailer has a strange issue with it's brake lights. when the truck lights are off the trailer lights function just fine, but if I turn the truck lights on the trailer brake lights come on as well. The rear trailer lights are not factory but replacements made for a car with a dual element light bulb and even a reverse light which is kinda strange seeing as it is a trailer and they don't use reverse lights. Could the aftermarket lights themselves be the culprit for the issue or do I need to be searching elsewhere? Thank you in advance.
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Old 08-12-2016, 11:31 PM   #2
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Welcome,

We had a Travel Supreme 5'r that had Chevy P/U tail light assemblies w/ reverse, built into the rear cap all worked fine.
7- Blade connector has reverse, current trailer uses the rear scare lights in reverse.
https://www.etrailer.com/faq-wiring.aspx

Be well.
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Old 08-12-2016, 11:41 PM   #3
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Welcome aboard, Jake.

Truck running lights are connected to the trailer brake lights somewhere in the trailer wiring. Might be connected together at the aftermarket trailer lights. That's where I'd start. verify with a multi-meter. If you don't find anything wrong there, tone/trace each wire from trailer lights to junction box.

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Old 08-15-2016, 04:39 AM   #4
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Thanks for the tips. I am going to get actual Trailer lights put back on and see if that's the problem which I'm pretty sure that's where it's at.
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Old 08-17-2016, 07:17 PM   #5
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Hello Jake1
This is where people run into problems - "shotgunning" (i.e. changing parts) without finding what the root cause problem. First, remove the lens from the trailer lights to determine if the lights are single or dual element types. If they are single element, then this is the problem. But if they are dual element, then determine if the previous owner just wired both elements together. Using a couple of jumper wires and a battery, simply ground one of the jumpers and "touch" each pin on the trailer connector. You should see running (both on), right stop/signal and left stop/signal. If this checks out, then you need to determine if the wiring on your truck connector "matches."

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Old 08-18-2016, 01:10 AM   #6
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Quote:
Originally Posted by Dutch Master View Post
Hello Jake1
This is where people run into problems - "shotgunning" (i.e. changing parts) without finding what the root cause problem. First, remove the lens from the trailer lights to determine if the lights are single or dual element types. If they are single element, then this is the problem. But if they are dual element, then determine if the previous owner just wired both elements together. Using a couple of jumper wires and a battery, simply ground one of the jumpers and "touch" each pin on the trailer connector. You should see running (both on), right stop/signal and left stop/signal. If this checks out, then you need to determine if the wiring on your truck connector "matches."

Best Regards
Dutch Master
Thanks Dutch Master for the tip. Your name reminds my of a great uncle I had who always had a Dutch Master cigar in his mouth.
I will give this a try this weekend. The lights have both a double element and a single element bulb. The single is the reverse light so I'm wondering if that is the issue.
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Old 08-18-2016, 01:59 AM   #7
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Here are the lights. You can see there are reverse lights on top.
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Old 08-18-2016, 03:47 AM   #8
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A very common light on trucks. 1 double filiment bulb for tail and brake/signal and 1 single filiment bulb in the reverse section.

If you have separate brake and turn lights( red brake and amber turn ) on your tow vechicle, you need a converter to wire the trailer lights.

You may also just have a ground issue.

As a test, take a jumper wire from something steel, on your tow vehicle, to your trailer frame. If this clears up the light problem, find the white wire in the connector and make sure it's well connected.
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Old 08-18-2016, 07:24 AM   #9
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I agree definitely check for ground issues.


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Old 08-18-2016, 01:48 PM   #10
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Your advice paid off. The po when mounting the lights put a screw through the jacket of the ground wire on the right light. Thank you for the help eveeyone.
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