I've got a friend's vehicle I was looking at (MA01) with no forward and reverse working.

I picked it apart.

The main transistor on the 'transistor card' was toast. I replaced it with a MJH11020G which was pin for pin the same, just needed a new heatsink. My only doubt is the hfe value - which probably will be right, but I'm not sure. Didn't fix the forward and reverse issue.

The main controller board had a burnt trace - fixed that.

turning the key switch yielded the main contactor adjacent to the transistor board starting to work again. I got it to go forward once, (out of many tries) but only once.

Looking at the relays on the transistor card, -putting the unit in forward and reverse shows minor movement of the relays. Relays test okay; but they are only getting driven with 7V for a 12V relay. Hence - I have a power supply issue.

I ran over all the 'dodgy' solder joints I could find, but to no avail. I need some sort of a manual. It is the SCM2-91 variant, 24V.

I've looked online for a manual, but I have come up negative. Is there anyone who could point me in the right direction for this?

Thanks