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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Have a 07 700 grizzly the battery keeps going dead and I just replaced it. the bike has 550 km

something is on ... somewhere.

That OR you arent charging.

Disconnect the battery put a amp meter between the + and the + wire. What is the reading? Anything above zero is a drain on your battery. Turn on the ignition ... what happened ... more drain?

Check your diodes in the rectifier to assure you arent loosing power to ground there because one is shorted.

Need more help, let me know ...



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