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Old 01-12-2014, 05:55 AM   #1
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1971 31' Excella 500
Imperial , Missouri
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Trailer lights not working

Hello everyone,

I just got myself a 71 Excella and the lights were working when I hooked it up, but after a friend of mine and myself power washed we cannot get them to work. The only lights I have are the running lights. Does anyone know of a spot were maybe a fuse or connection that could cause this might be?

Joe
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Old 01-12-2014, 06:32 AM   #2
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Be careful with pressure washing. Some people won't do it at all because it can open up seams and cause leaks.

Which lights specifically are not working? tail, stop, backup, interior?

The running lights are hard wired into the tow vehicle. If there is a blown fuse it would be in the tow vehicle. Also the wiring of newer tow vehicles will not match up with a 71 without some rewiring.
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Old 01-12-2014, 06:46 AM   #3
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The only lights I get are the running lights after we power washed it. No backup, turn signal, or stop.
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Old 01-12-2014, 06:53 AM   #4
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Check the fuses in the tow vehicle. Under the dash and or under the hood. Jim
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Old 01-12-2014, 06:54 AM   #5
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First check and clean oxidation off the umbilical connection where it plugs into the tow vehicle and trailer. Does the tow vehicle have a tow package? Check if there is power coming out of the tow vehicle connection. Then take the lenses off the taillights and clean and check if you have power to the sockets.

The interior trailer lights are not working either?
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Old 01-12-2014, 06:55 AM   #6
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Also make sure the unbilical cord is plugged in properly and clean and dry. Jim.
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Old 01-12-2014, 07:00 AM   #7
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Try the easy stuff first. Ensure that the male and female plugs are clean and dry. Perhaps a little scraping with something abrasive. Also, use a little test light to ensure that you are getting power at the plug from the car. Check the fuse panel in the car if you are not getting power. Test light first, clean second. Jim
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Old 01-12-2014, 07:18 AM   #8
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If you don't find an easy fix. A wiring diagram will save you a lot of frustration. I can fax to you if you send me a fax number, but wiring diagrams should be in the archives.

Check with the PO if the tow wiring has been reconfigured to the industry standard. If not, the wiring coming out of the TV will not match the trailer and will blow fuses, and bulbs and just plain won't work right.
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Old 01-12-2014, 07:49 AM   #9
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Thanks for the replies. My truck has a factory tow setup on it. It is a 03 F250 Super Duty. I did forget to mention that my electric brake module lights up when its plugged in. I cleaned the connections and put for dielectric grease on them but I still only get the running lights and electric brakes. Like I said before everything was working before we washed it so i was thinking maybe there was something that controlled them in the trailer. I have not tried the inside lights. It there a breaker that needs to be tripped or something to get them to work off the battery when not plugged up or does it do it automatically?
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Old 01-12-2014, 09:40 AM   #10
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There are 3 independant and separate electric systems in the trailer. All lights on the outside (except entrance and scare light) run off the tow vehicle. The 12v lights inside the trailer run off the trailer battery and are fused. The 120v system has circuit breakers. The trailer battery is charged by the 120 system.
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Old 01-12-2014, 09:47 AM   #11
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Don't want to sidetrack this thread but if you are planning on towing any distances what is the history of the running gear? Tires need to be replaced if they are older even if they look good. And if your axles are original it's a good bet they need to be replaced.
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Old 01-12-2014, 04:54 PM   #12
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The tires are new and the axles are the original ones. I plan on checking over the axels to make sure they are still good.
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Old 01-12-2014, 05:22 PM   #13
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Quote:
Originally Posted by Jas155 View Post
The tires are new and the axles are the original ones. I plan on checking over the axels to make sure they are still good.
It is unlikely the original Henshen Dura Torgue axles are still good. Once they are gone they are gone. There is a great quantity of information archived in the forums that will help with checking the axles.
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Old 01-12-2014, 06:00 PM   #14
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Quote:
Originally Posted by Lumatic View Post
It is unlikely the original Henshen Dura Torgue axles are still good. Once they are gone they are gone. There is a great quantity of information archived in the forums that will help with checking the axles.
What would be a good indication that they are bad? I have already pulled the thing 300 miles and didn't notice anything out of the ordinary.
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