1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 213Get this manual

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CHARGING SYSTEM

aOutput WireORANGEExcitation WirePURPLESensing WireREDPURPLEVoltmeter (0-20 Volts)Ground

EXCITATION CIRCUIT
1 Connect positive (+) voltmeter lead to tie

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