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Old 09-25-2022, 06:41 PM   #1
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towed vehicle lights not working

Mashed the cable in the blue ox tow bar from the RV to the towed vehicle and killed the cable. Replaced the cable but still no lights on the towed vehicle.

Can't find any bad fuses. Could the wiring have melted somewhere when the cable was mashed?

Ideas?

Thanks so much.

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Old 09-25-2022, 06:48 PM   #2
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To the left of your leg, under the dash, there should be a black panel. It has fuses for the trailer connector.
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Old 09-26-2022, 07:40 AM   #3
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Without knowing what chassis you are on, I recommend digging deeper into the power paths for those circuits.
Check rear socket for voltage for each function. Left turn, right turn, brake, and marker lights.
Check fuses for trailer wiring.
A Ford F53 and E450 will have a relay or two mounted under the MH. Fuses should have protected them from the mashed cable, but stranger things can happen.
Check ground wire from motorhome rear socket to chassis ground.
Check ground connection between toad and MH. You can connect a temporary ground wire from toad body to MH. (I ran one winter with this temporary ground wire until I got home in spring to replace the permanent ground wire. Used a quick connect spade connector to disconnect the temp ground).
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Old 09-26-2022, 07:44 AM   #4
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Don is usually spot on.

And no, you would not likely have melted wires. Fuses should protect from exactly that issue.
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Old 09-26-2022, 12:24 PM   #5
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If all else fails, try the Tekonsha Modulite.
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Old 09-26-2022, 04:41 PM   #6
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You definitely blew a fuse, trailer plugs has separate fuses for the trailer/toad, not knowing anything about your coach doesn’t help, is it gas or diesel ?
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Old 09-26-2022, 04:58 PM   #7
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Old 09-26-2022, 05:47 PM   #8
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Looks like a Ford chassis so I agree with Don on its location
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Old 09-26-2022, 05:50 PM   #9
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In addition to the dash box....

My F53 has another fuse box under the hood with the trailer lights fuses..

Both have fuses/relays for trailers lights

Assuming you have an F53
Attached Files
File Type: pdf Under hood Fuse.pdf (453.3 KB, 3 views)
File Type: pdf Dash Fuse.pdf (538.4 KB, 4 views)
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Old 09-26-2022, 08:30 PM   #10
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Did you replace with a good quality cable with metal ends? I smashed mine on my last trip and bought a new cable made with rubber ends. It would not work. I replace with one that had metal ends, and everything worked fine.
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Old 09-27-2022, 09:41 AM   #11
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Use a simple 12-volt test light to check fuses. Pulling them for inspection can be tough.

Just touch each end of the fuse. IF the fuse is powered you will see voltage on each end.

Some people are not aware that there is a tiny bit of metal at the top of each end of the fuse which makes testing easy.
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