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Old 10-25-2011, 04:35 PM   #15
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Originally Posted by wingnut60 View Post
Two sets of fuses on Fords? One on right side of dash, one under hood. Check the ones listed for trailer lights under the hood...
Bingo! There are 2 relays under the hood for the tow master unit. Both were clicking but when I reversed them the tail lights worked on the drivers side. Replace the bad one and now everything works.

Thanks for all the replies and help.

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Old 10-25-2011, 06:27 PM   #16
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That one is easy/hard... The tester is most likely LED's. very very very low power draw.

There is a bad connection, might be a ground, might be something else, will be on the TOW vehicle side, not the trailer side.. i'd start with the ground if it affects both right and left, and the "hot" lead if it affects just one side.

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Old 10-29-2011, 07:23 AM   #17
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Seems like something similar to what had us baffled in the past. When we plugged in there seemed to be no connection. Turned out to be some corrosion between the contacts in the cord to the trailer. Have you tried cleaning the plug? Maybe put some di-electric grease in after it is cleaned.
Judy & Ralph, w/Molly (the Westie) & Sadie (the Fourche Terrier)
2011 Ford F350 6.7 Lariat
2013 Infinity 3850RL
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Old 11-01-2011, 08:51 AM   #18
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I experianced some crazyness with the tail lights on my 5er and found a bad converter in a cavity behind the tail lights themselves.

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