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Old 07-12-2014, 12:42 AM   #1
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New to this forum. I am having problems with no power going to the 7 pin trailer connector. When I hooked up the trailer there was no signal lights no brake lights. I checked the plug with an automotive test light and there is not power for the signals and brakes. I installed the relay that was given with the truck so that 12v will be available at the 7 pin connector. I tested the pin and there is 12v present. I thought it may be the wiring harness but with the 12v present I am not sure that it is the harness. Any idea about this problem?
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Old 07-12-2014, 12:48 AM   #2
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The relay only provides, charging if the trailers batteries not power to the plug. Just a FYI.

But for starters is start checking fuses.

Wayne
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Old 07-12-2014, 06:26 PM   #3
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fuse #9 relay#21 on 09 to 14 f150s look at them if there good take it in you might have to drop rear tire and see if you have a bad connection at the rear harness block connector
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