Sensing Circuit - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

Sensing Circuit

1. Unplug RED or GREEN lead from voltage regulator.
2. Connect positive (+) voltmeter lead to RED or GREEN lead and negative (–) voltmeter
lead to ground terminal.
3. Voltmeter should indicate battery voltage. If battery voltage is not present, check
sensing circuit for loose or dirty connection or damaged wiring.
90-860074--1 FEBRUARY 2002
a - Output Wire - BLUE
b - Excitation Wire - PURPLE
c - Sensing Wire - RED or GREEN
d - Voltmeter (0-20 Volts)
e - Ground
d
a
e
c
b
CHARGING SYSTEM
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Page 4B-13