Trailer wiring electrical issue
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Trailer wiring electrical issue
I have a 99 F350 that is wired from the factory for the trailer circuit. I know the center (6 contact plug) is constant on power. I guess this is for auxiliary power or trailer battery charging. I was using a test light and checking things out at the trailer connector and inadvertently shorted out this center auxiliary power circuit to ground. I no longer get a light when testing the center contact with ground. I have searched every fuse and can not find the problem. All other circuits on the connector are working. Is there some relay that I can’t find that may be damaged from the short. I appreciate any assistance on this matter.
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Originally Posted by nathanael
I have a 99 F350 that is wired from the factory for the trailer circuit. I know the center (6 contact plug) is constant on power. I guess this is for auxiliary power or trailer battery charging. I was using a test light and checking things out at the trailer connector and inadvertently shorted out this center auxiliary power circuit to ground. I no longer get a light when testing the center contact with ground. I have searched every fuse and can not find the problem. All other circuits on the connector are working. Is there some relay that I can’t find that may be damaged from the short. I appreciate any assistance on this matter.
Last edited by touchofgrey; Jun 30, 2005 at 02:52 AM. Reason: addition
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Trailer fuse issue
Thanks for your response... Yes the trailer fuse box # 16 big 30 amp fuse is the first thing I checked (i checked all the fuses...). It looks fine. They are so big it’s pretty easy to check. That’s why I was assuming that there was some relay or regulator that metered the current to the trailer charging circuit. It’s got me frustrated now that I can’t find the problem (chuckle). I have two trailer connectors and neither one is working for the center contact. All other circuits work though...
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From: Robbinsville NJ
OK, maybe this is a dumb question but....
My center plug is not always on, only when the ignition is on. If you were testing with the ignition off, maybe your relay was stuck and no longer is.
My center plug is not always on, only when the ignition is on. If you were testing with the ignition off, maybe your relay was stuck and no longer is.
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It's a good idea when checking fuses to test for continuity across both ends or prongs of fuse. Sometimes it's hard to see a break visually.
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From: Utah County, UT
Originally Posted by SSORD
It's a good idea when checking fuses to test for continuity across both ends or prongs of fuse. Sometimes it's hard to see a break visually.
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