I have a 14ft utility trailer I pull regularly with my ram but every time I turn on the parking lights I blow a fuse. How can I fix this?

 

That depends on how long it takes to blow the fuse. Immediately or do they stay on for a while? If it's immediately, you have a short in the wiring somewhere. If they last a while the amperage being drawn is more than the fuse can handle.

Upgrade to bigger wire and larger fuse for the second, or maybe smaller bulbs?

If the fuse blows right after you turn on the parking lights you'll need to get a multimeter and start checking the continuity. Could be the trailer wires, could be the hookup wires on the truck.

You should only have zero ohms between the ground wire and any bare piece of metal of the trailer frame. If any other wire to ground is zero you'll have problems, and since your light bulbs have resistance your read some continuity between hots and ground, 100 to a few hundred ohms...depends on the bulbs.

 

do NOT put in a bigger fuse. check your truck and trailer wiring and assume that something is mis-wired or shorted. the most likely culprit is a pinched or bare wire on the trailer, shorting to ground.

 

Well it blows it immediately and it doesn't when I'm pulling my little snowmobile trailer so I assume it's the trailer wiring right?

 

yeah I would say it's the trailer if the other one is fine....

 

don't assume anything. i was blowing backup light fuses when towing. tested the trailer wiring and it seemed ok. tested my truck wiring and found previous owner had wired the backup lights into the ground pin....

very creative if your trailer is wired to match it. sucks if not.