I have a MM200. I bought it from the guy who taught me to weld when I was a kid, and he bought it new. Wire drive is about the only weak link on them. Capacitor banks are very old by now as well, you will want to replace those if you can get the machine going. Go on the millerwelds.com site and download the manual for your serial number. You will need it so you know how to position the jumpers on the reconnect board BEFORE YOU PLUG IT IN. I also assume you are going to clean all the old grease out of the transmission and re grease it before you bolt the motor on. When you are reworking the connections, the voltage selector gets stiff and benefits from some lube. The contacts benefit from cleaning with some fine sand paper as well, then loosen, wire brush, tighten each tap connection. Be careful with the voltage selector, as it is made from unobtainium, though it is fairly stout.
Cruizer hasn’t been around the Miller board for a while. Head on over to Weldingweb.com and register there. There are several guy who are real pros with this machine, and there are a lot of MM200 repair threads there as well.
