Have RV Questions? Ask an RV Mechanic Online.
It sounds like you got the brakeaway switch wired up to the hot lead OR the brakes and charge leads reversed. Probably the latter. Blue is brakes and black is charge lead. Check that and get back to me if we need to dig deeper into this as all follow ups are included in our fee.
Just checking back in to see if you got this resolved or do you still need some help and additional input from me here?