Removed Battery for winter, time to put back. Forgot what wire is
positve and which is negative ( ground) .
Unit is 2009 fun finder 210 wires on trailer ,one is white , one is black.
one also has an inline fuse. Do not want to hook up backwards.
As you're looking down at the battery (if you're facing the camper), on the left side (not the top) of the A frame there should be a small white sticker. It doesn’t jump out at you, but it's there. I wish that the cables were clearly marked myself…
The black wire has the inline fuse, so does that mean it is the positive ?
Then the white would be ground.
Well normally in an automotive 12V system the the positive is fused to protect the whatever is 'downstream'. And normally grounds are black or brown. I have to admit I'm new to trailers so there could be differences.