Trailer jack blowing fuse

Have an odd issue. Have a Mallard m312 trailer. I installed an electric tongue jack on it, which I had on my previous camping trailer. Wired it exactly the same as I did before which was directly to the camper battery. I have an inline 30amp fuse on the positive side. Jack works great. Never had an issue on my previous trailer. On this one, as soon as I plug the lights plug into my truck, it blows the fuse. It never did this on my previous trailer. I double checked everything but kind of tough to mess up two simple connections...it can be done tho. Haha. My immediate solution is to stay unplugged from the truck when I use the jack. Then pull the fuse right before I plug in the lights. But there has to be something I'm still missing....
 

wdk450

Well-known member
Maybe your truck connector is miswired? A lot of times in troubleshooting it is helpful to ask "What changed"??
 
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