Question about Yamaha XS 650 B Motorcycles

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I have a 79 650. Been having trouble keeping a charge. bought a new stator but didnt help. bought a new battery that didnt help either. ?

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Well what you need to do is take volt meter and start the bike see if you are getting 13,5 volts at battery or more if not hold throttle at 1500 rpm and see what you have if you do not have this volts coming to battery it could voltage regulator or stator is bad but check all grounds to bike and wiring hope this helps

Posted on Oct 06, 2009

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Hi and welcome to FixYA,

Two possibilities:
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The stator would be producing relatively high AC voltage while revving the bike. The stator output AC voltage are fed to the rectifier / regulator through 3 white wires. Check calls for testiing for the presence of the AC voltage on any pairing of the white wires before and after the connector before the voltage regulator. Check on the regulator calls for checking the battery voltage when revving the bike (14.5 VDC).

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