We have just purchase a Crown model 20Mt-S serial number 1A15911. looks like it has light use, but not maintained properly.
The drive wheel only runs sporadic, and only in the slow mode when it does run, you can hear the magnetic switches kick in but not the drive.
So far I have cleaned all the post, refilled and recharged the batteries, which were really low. Cables and batteries look new and cleaned the connection to the drive motor. I have started to clean the contacts on the magnetic switches and checked the safety switches.
Any other advice or problem areas I should be looking at? Also where can I find a wiring diagram and owners manual to download?
Once I get this running I will replace all the batteries, I don't want to put too much money in before I find out this is just an anchor

thanks in advance