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Old 04-26-2016, 03:47 PM   #1
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Can LED trailer (dolly) lights go bad? Mine's blowing my brake light fuse.

My newish Tow Dolly with LED lights is blowing my brake light fuse. The turn signals work fine, the tail lights work fine, hit the brakes and "pop". Since the turns work, I am assuming it is not a wiring short.

Has anyone experienced this and, if so, what was your solution?

TIA
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Old 04-26-2016, 04:06 PM   #2
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SHutson-

The fact a fuse is blowing almost guarantees a short is the cause.

If it doesn't happen when the dolly is disconnected from the coach, then I'd check the dolly brake and brake light light wiring, starting at the hitch connector on the dolly.

Could be in the cable, too.
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Old 04-26-2016, 04:30 PM   #3
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Also check for corrosion on the terminals of your plug (male and female sides). Recently blew a fuse on my F250 running light circuit because of corrosion creating more resistance. Fixed the corrosion, replaced the fuse, and trouble free for the subsequent 1,250 miles.
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Old 04-26-2016, 05:15 PM   #4
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Had the same issue on my dolly. Stilh dolly and found a wire under right fender rubbed through.
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Old 04-26-2016, 05:34 PM   #5
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Turn on the signals or 4 way flashers and look for a dimmer light.

That could be the one with a short.

The fuse may not blow with flashers because it's not on very long.
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Old 04-26-2016, 07:25 PM   #6
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Quote:
Originally Posted by twinboat View Post
Turn on the signals or 4 way flashers and look for a dimmer light.

That could be the one with a short.

The fuse may not blow with flashers because it's not on very long.
Excellent theory. I will try that
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Old 04-27-2016, 09:46 AM   #7
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I'd jump the fuse holder and put a meter on it to see exactly what current you are drawing that's causing the fuse to go. I'd also check the turn signals to see if they'd blow it if they were on long enough. Sounds like maybe some current leakage somewhere so a good meter and some time will be necessary to chase it down. Just isolate pieces in the system, get readings on what's left and you'll find it.
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