Mechanic Job in Everett, Washington

Van isn't starting - husband accidentally made connection on battery terminal and sent current wrong direction, fried a bunch of relays. We've had relays replaced now, still won't start. We have one opinion that we need a whole new ipdm - but one relay in ours is the ignition access for our battery isolation manager (we also have solar and a battery isolator for our house batteries) we don't want to break that very important connection without someone who can put it back together correctly. Looking for someone knowledgeable in electrical systems, if mobile RV offgrid living stuff all the better, most mechanics that have looked at it so far had no idea what the isolator was and its a pretty standard thing among the vanlife community.