1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 830Get this manual
Quality of the image is intentionally reduced!
REMOTE CONTROL ELECTRICAL TEST PROCEDURE (225TR and 255 n-TR) CAUTION: Disconnect battery leads from battery before attemp'l ing any of the following stepsI Disco nnect contro hift harn ess white Jead