Checking Generator

It is possible to trouble shoot faulty generator without removing the generator from the engine or, if necessary to remove it, without completely disassembling the generator. When a generator stops charging or not charging at a satisfactory rate as evidenced by a "dead" battery or signal light on switch panel remaining lighted, it is recommended that unless the trouble is known definitely, the following checking sequence be used:

On installations employing a fuse in the generator field circuit, remove fuse at regulator and examine it to see if it has blown. When replacing fuse be sure insulating sleeve is in good condition and covers fuse properly.

Make certain the generator signal light circuit is not grounded. Remove the wire or wires from the generator "A" terminal and position so contact is not made with motorcycle. Turn ignition on. If generator light on instrument panel goes on, light circuit is grounded and may be reason for the generator not charging. If this circuit is grounded this condition must be corrected. If the generator signal light circuit tested O.K. or if a grounded condition has been corrected, proceed to testing generator output.

TESTING GENERATOR OUTPUT (See wiring diagram following)

Remove wire from "F" terminal of generator. Connect a short jumper wire from generator "F" terminal to ground on motorcycle. Remove wire or wires from generator "A" terminal and connect the positive lead of a 0-30 ampere ammeter. Start engine and run at a speed of 2000 RPM (approximately 40 MPH). Then momentarily connect negative lead of ammeter to motorcycle battery positive terminal. (Battery should be known to be good.) If the ammeter reads 15 amperes or more for a 6-volt generator or 10 amperes or more for a 12-volt generator, generator is not at fault. Therefore, the difficulty is in the regulator or wiring circuit. (See Voltage Regulator Section 51). If generator shows no charge or charge below minimum rate, it must be removed for further checking.

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