Sorry I misplaced my password and the system here does not send password when you forget it, no email sent. so had to get another id. I couldnt find any circuit diagrams and am attaching some pictures of the circuit to start with. A few notes Input from the unit is AC 110/120v Relay tested is ok Transistor when given small voltage on emitter and base it works and the relay clicks manually. so transister seems ok. I guess the diodes on the circuit are used to convert to DC voltage since relay is 24v DC. ? Checked the Capacitor, shows 54 volts DC across the big one.