2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 328Get this manual

2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 328

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ELECTRIC STARTING SYSTEM

Remove the diode from the couplerConnect the pocket tester1) to the diode terminals as shownCheck the diode for continuity as followsTester positive probe BlueRed