1999 "EE" Outboards Accessories Service Manual, P/N 787026, Page 65Get this manual
Carburetor ModelsWhen installing an isolator, be sure not to make any changes to the engine's cranking battery wiringThe only connection needed is to install wire between the terminal board and the isolator, or the addition of OMC Isolator Harness Kit, PIN 502090, when applicableRefer to wiring schematics in this sectionWhen connecting new wires, take care to select the proper gauge wire Wire gauge depends on the distance between the engine and the isolatorFollow ABYC specifications on wire gaugeA minimum of 10 gauge is recommended Master Battery SwitchesAny master battery switch in the engine 's electrical system must contain "make-before-break" circuit to protect the engine's charging system Never move the switch from one position to another while the engine is running Move the switch only when the engine is stopped