Thanks, Brian. My supply is a Pyramid 5-amp (7-amp surge), 12-volt supply set for 13.8 volts. I'll look into whether there is a voltage set adjustment internally for a higher input to the mount's electronics. I use power pole connectors between power supply and the Gemini power input cable. But all other connections are via push-in multi-pin connectors. As was mentioned, these can be subject to corrosion or detritus interfering with good, low drop connection.
When I bypassed initial star alignment, I chose sidereal to enable the hand controller to control motors directly. Once I got the Dec motor to respond, the motor-stall error went away on go-to star alignment.
Edit:
I checked the supply voltage - 13.8V idle, 13.6V under light load. I used a small inverter to power a <10W LED lamp. So upping the output voltage looks to be worthwhile. I don't use it for anything but the Losmandy G11 mount.
Russ
Russell Milton