DC inline fuse blows when battery power turned on

thanks Chris. i swapped them and now no blown fuse, but still no power to cabin. I went to fuse box and checked the two 30a fuses located at top of what i will call the DC distribution panel. no issues. the negative from battery connects to top left terminal on panel. the positive comes in and leaves on white wire from battery on top right. Right beside it is a red wire which the panel says is the positive from converter. when i put meter on the white and black terminals, there was not power. Could this be a bad converter??

Fuse is typically on a heavy black wire to the positive battery terminal.
Main negative connection is usually white and connects to the frame.

baseball wrote:
Anyway, when I go to turn on the DC power to trailer, it blows the inline 30 amp fuse. it is located on the negative side of battery.

It's not a fuse but a circuit breaker, usually auto resetting, and it should be in the positive cable coming from the battery. Sure sounds like you've connected the battery backwards.

Are you sure that is a negative cable? Not sure why there would be a fuse there except maybe reverse polarity protection but have never seen it done that way. Trace the wire to the frame and make sure positive and negative are correct.

If it just started when you replaced the battery, odds are you hooked it up wrong.