Hello I am new to this site hope ya'll can help me. I have an 02 f 250 diesel and last thursday I drove through dallas tx during that snow storm they had and I was pulling a trailer I had just bought. I had the lights on since about 10 that morning and when I got home around midnight I turned off the truck and went inside I looked out about 2 am and the clearance lights were on on the trailer only so I just went and unplugged the plug and figured something happened with all the moisture. I guess it was more than moisture because the trailer lights come on when I plug any trailer in. I have pulled 3 other trailers since then and they all do it so I was checkin into it tonight and figured out that when I take out the trailer clearance light fuse #38 that the lights go out. Like I say the light switch off and the clearance lights on the trailer plug still has power. I am thinkin it is probably the trailer clearance light relay is stuck could that be the cause?? Its weird that there is 2 questions about the same part in 1 evening but anyhow. I hope someone can help me and thank you in advance if you can. This little deal is inconvenient as hell in cold wet weather.

 

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Welcome to the site..

Did you try a 'thump' on the CJB?

 

I did not try that I didnt know how much it could take with that circuit board in it. If that fixes it should I get a new one or will that one be okay?

 

Haya yes i tried giving the cjb a thump tonight and it didnt help. Is that most likely where my problem is? Is it time to replace it?