Provided ALL connections are tight, a good battery is in use, the switch is installed on the POSITIVE TERMINAL side, and the KEY IS ALWAYS IN THE OFF POSITION WHEN OPERATING THE BATTERY SWITCH: No Problem!
Modern BIA Regulations actually REQUIRE one in many cases.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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