I bought an older sw1500 that originally had the 5 volt board system in it. The board must have went bad at some time or another, so somebody took everything out and made it a non powered unit. I have a couple of bigger diesels with 3 volt systems and I'm trying to make this run again. I was wondering if somebody on here might have a parts diagram for an sw1500 with the 3 volt board, as I'm having trouble trying to fit everything in there. The only parts diagrams I can find on mth's website for sw1500 engines are for the older 5 volt system. Any help or suggestions are appreciated.