Modern Buddy

Just bought a 2009 Stella 150 2T, will start with kick start, no start with with electric starter. If I push starter button I can hear starter relay clicking, but starter doesn’t turn over. Tested starter, by putting 12 volts directly to motor, nothing. Ordered new starter motor, tested it, worked, installed and worked first day, no problem. Next day, pushed starter button, just clicking from relay, but starter wouldn’t turn over. Checked fuse, OK, checked battery, 13.2 volts, clutch switch works. I’m at a loss as to what to do next, any suggestions? Thanks in advance. Dennis