Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 45Get this manual

Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 45

Alternator System Circuitry Test Using 0-20 volt DC voltmeter, perform the following tests:
Voltmeter should indicate battery voltageIf correct vOltage is not present, check sensing circuit (RED lead) for loose or dirty connections or damaged wiring
OUTPUT CIRCUIT

1Connect POSITIVE (+) voltmeter lead to alternator output terminalConnect NEGATIVE (-) lead to case
ground on alternator2Shake alternator wiring harnessMeter should indicate battery voltage and should not varyIf proper reading

is not obtained, check for loose or dirty connections or

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