If the ram is a bit older, the motor has long been out of manufacture. I spent many hours trying to find one several years ago with no success. If anyone knows of a suitable replacement (with manufacturer and part numbers) many would be very appreciative.
That said, there may be options, depending on what the problem really is.
If it is the ram, several issues can arise:
1. The internal potentiometer which serves as the ram position sensor
does fail, but is a commonly available, easy to replace and inexpensive item. I forget the specs, just match what is there.
2. When my motor failed, disassembly showed the phenolic (?) brush holder had overheated and distorted. I was able to restore it to its original shape with very careful application of heat from a heat gun. Worked fine after that.
3. My control unit went wonky, and I am not good at fixing electronic guts and there was no evidence of internal damage, so I replaced the unit with a Raymarine
course computer. If doing this several issues arise:
a. Make sure you select a CC that can support the 20 amp current
of the drive.
b. The Ray CC does not "know" where the ram is, only where the rudder
is. Since the Alpha uses a manual mechanical disconnect, it is VITAL that the CC never be engaged when the ram is disconnected. This can be done by "procedure" but if one messes up, the ram can be damaged. I used a microswitch to sense a disconnected ram and a relay to interrupt current
to the ram. Works perfectly.
If you want more details, PM me.