TROUBLE SHOOTING THE YARDMASTER 1000 - 12/24/72 Volt …

With the engine not running, the battery voltage should be 12.5 volts. Once you start the engine and adjust the throttle to full rpm, the battery voltage should go up to 14.5 volts. If there is no rise in voltage at this point, the alternator has lost its residual magnetism in the rotor and will not self-excite. ................
................