1991 Johnson Evinrude EI 60 Loop V Models 150, 175 outboards Service Manual, Page 213Get this manual
Battery Specifications All batteries should be of heavy duty, marine constructionMaintenance-free (sealed) batteries can be used with Loop "V" modelsDeep-cycle batteries must not be used as the engine's cranking batteryTheir design will not sustain high rates of charging and dischargingFor best performance, OMG recommends you use 12-volt battery with minimum rating of 500 cold cranking amps (GGA) at (105 amphrsat -18 G) and 99 minutes reserve capacity at 80 (2r G)Battery Devices Battery IsolatorsIf you are rigging Loop "V" model where the engine charging system will support two or more batteries, you should only use one of the following battery isolator devices: One engine to two batteriesModel 2420 One engine to three batteriesModel 2424 Two engines to three batteriesModel 2423 The above battery isolators are manufactured byGuest Products Battery "On-Off" SwitchesIf you are using battery master "On-Off" switch in the engine's 12-volt electrical system, be sure that the switch is equipped with "make-before-break" circuit to protect the engine's battery charging systemAvoid switching while the engine is running, and never turn the switch off unless the engine is stoppedBattery Testing