Perkins 900 Series Workshop Manual page 228

14
900 Series
If the warning light continues to show and the ammeter shows no output when the alternator is in
operation:
Check all the connections at the regulator, alternator and battery.
If no fault:
Turn the switch to the "off" position. Disconnect the wire from the "F" terminal on the alternator and connect a
wire between the "F" terminal and the negative terminal on the alternator. Turn the switch to the "on" position
and operate the engine at fast idle.
If there is no output, there is a fault in the alternator.
If there is an output, there is a fault in the regulator.
If the warning light continues to show when the alternator is in operation and the ammeter shows a
reduced output with maximum output only at maximum engine speed or if the warning light does not
show, but there is a reduced output from the alternator with maximum output only at maximum engine
speed:
There is a fault in the alternator.
If there is an intermittent light from the warning light and the ammeter needle is not stationary when
the battery is charged fully and no load is applied:
Check for a higher than normal resistance in the negative control wire of the regulator.
If the resistance is normal, there is a fault in the regulator.
If the battery charge is too high and the ammeter indicates high or maximum output at all times:
Check the positive control wire and its connection at the regulator.
If the wire and its connection are correct, there is a fault in the regulator.
218 Workshop Manual, TPD 1345E, issue 3
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