OMC Stern Drives And Motors 1964-1986 Repair Manual., Page 248Get this manual
ELECTRICAL 6-1 INTRODUCTION The battery, gauges and horns, charging system, and the cranking system all considered subsystems of the electrical systemEach of these units or subsystems will covered in detail in this chapter beginning with the battery6-2 BATTERIES
The battery of the most important parts of the electrical systemIn addition providing electrical power the engine, also provides power operation of the running lights, radio, electrical accessories, and possibly the pump bait tankBecause of its job and the consequences if should fail in an emergency, the best advice purchase well-known brand with an extended warranty period from reputable dealerThe usual warranty covers prorated replacement policy which you would entitled consideration for the on the warranty period if the battery should prove defective before its timeDo not consider battery of less 70-ampere hour capacityIf in doubt as how large your boat requires, liberal and then purchase the with the next higher rating
unit for the boat and other types of batteries used only in an emergencyMarine have much heavier exterior case withstand the violent pounding and shocks imposed on as the boat moves through rough and in extremely tight turnsThe plates in marine thicker than in automotive batteries and each plate is securely anchored within the battery case ensure extended lifehe of marine batteries "spill prooftt prevent acid from spilling into the bilges when the boat heels one side in tight turn or is moving through rough waterBecause of these features, the marine battery will recover from low charge condition and give satisfactory service over much longer period of than any type of automotive- type unitTERHINAL