Voltage Output - Mercury 150 EFI Service Manual

CHARGING & STARTING SYSTEM

Voltage Output

1. Using a 0-20 volt DC voltmeter, connect POSITIVE (+) lead of voltmeter to TERMINAL
B of alternator and NEGATIVE (–) lead of voltmeter to engine ground.
2. Start engine and allow to warm up. Increase engine RPM from idle to 2000. Normal
voltage output should be 14.1 – 15.0 volts.
NOTE: If alternator is under-charging, check connections. If alternator is over-charging,
replace alternator.
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Page 2B-16
Terminal B
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90-883728 JULY 2001