Connecting the battery and....

[JoeNanMinn]

Happens to the best of us at one time or another. Whether we care to admit it or not.
Glad you figured it out. Go have some campin fun.

[spierce617]

To bad Forest River does not add this sticker to all of the units that are wired this way.

[johntaylor]

Originally Posted by TGR

If there is a convenient place near the battery to use a sharpie, write down “White to Batt. Pos. (+)” and “Black to Batt. Neg. (-).”

NO! Other way around.
Black is positive (+)
White is negative (-)

[dcheatwood]

Originally Posted by saltyman

You are not an idiot, we have all done DUH things!!!

Yep. And another pricey mistake avoided by the wealth of info on this forum.

[chriscowles]

Originally Posted by TGR

It is the normal trailer wiring convention to have the black wire positive and the white wire negative for the battery connections with the negative circuit tied to ground.

On my 21DK, FR used red for positive and white for negative on DC circuits. White is grounded at the frame and red goes to the circuit breaker under the front of the trailer.

That's true at the battery. Internally they use two-conductor wire that looks like lamp cord but probably is heavier gauge. It's white with a red (or other color) stripe, the stripe side going to the fuse and the white going to the common ground block.