OMC Stern Drives And Motors 1964-1986 Repair Manual., Page 27Get this manual
t alternator away from the engine until the belt deflection is 114 inch (6.35mm) when you downward pressure against the beltMake the belt deflection measurem midway between the circulating pump pulley and the alternator pulleyTighten the alternator bracket and pivot bolts securelyIf the battery has record of not holding full charge, check the tension of the drive beltThe failure hold full may also be caused by faulty alternator or voltage regulatorThe of using much is usually to the voltage regulator being set highIn this case, replace the regulatorR service details of the electrical system