Question about 2008 Yamaha Royal Star Venture

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We have 1992 Yamaha Venture. Something keeps draining the battery. Can be driven home from work and by the time I get home the battery is drained. We also have a sidecar with extra lights. We have had this checked out several times. Have had new battery and checked electrical system

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If the battery is draining while the bike is running you have a failure in the charging system. Check your alternator and your voltage rectifier. While the bike is runnning, if you put a voltmeter on the battery at idle you should get around 13-14v. If you rev the engine up to 3-4000 rpm that voltage should rise a bit, say 1/2 to 1v. If you increase your electrical load (lights, heated grips or clothing, radio, etc.) it should rise a little more.

With the bike off and the key off, put your voltmeter's red lead on each fuse in your fusebox and the black lead to ground. Are you getting any voltage? There should be none on any fuse that does not have power while the bike is off. If you find voltage, note what circuit you find it on and check that circuit for a faulty component or shorted wiring.

Good luck to you.

Posted on Jan 10, 2009


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