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xs650 > > Frank-in-Bike, Non XS parts that are Interchangeable > > Electrical and Lighting > > voltage drops when off


voltage drops when off
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felixs
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Joined: Jun 25, 2007
Posts: 10
Location: 8 deg south

PostPosted: June 25, 2007, 2:15 am    Post subject: voltage drops when off

hello all

i m a newbie with a 72 xs and just bought a new battery, but when i shut the engine off, the voltage drops or drains out very quick as seen on my external voltagemeter. then when i jumpstart it
it may fire once byitself.

any ideas Idea ?
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jayel
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Joined: Apr 16, 2006
Posts: 3417
Location: SE Iowa 1974 TX650A

PostPosted: June 25, 2007, 8:23 am    Post subject: Re: voltage drops when off

your voltage rectifier/regulator is probably bad, allowing battery to drain down, check a Haynes manual for the tests recitifer most likely, it's a 3 phase diode bridge probably bleeding back to ground it's under your battery box, black red and white wires
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Last edited by jayel on June 25, 2007, 6:13 pm; edited 1 time in total
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INXS650
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Joined: Mar 22, 2007
Posts: 645

PostPosted: June 25, 2007, 5:39 pm    Post subject: Re: voltage drops when off

You should be able to unplug those, and see if that is where your drain is coming from. Does the bike charge properly once it is running?
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felixs
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Joined: Jun 25, 2007
Posts: 10
Location: 8 deg south

PostPosted: June 26, 2007, 6:07 am    Post subject: Re: voltage drops when off

thanks for your hints, i will check tomorrow first thing.

yes the bike does charge ok !
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INXS650
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Joined: Mar 22, 2007
Posts: 645

PostPosted: June 26, 2007, 7:20 am    Post subject: Re: voltage drops when off

I wouldn't think it was a bad rectifier/regulator then. Look for something grounded out, shorted. Does your bike have more than one fuse? You can try pulling the fuses out if it does, and see which one stops the drain.
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Xumi
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Joined: May 18, 2007
Posts: 395
Location: San Marcos, CA

PostPosted: June 26, 2007, 11:36 am    Post subject: Re: voltage drops when off

Another thought.. does the battery drain when it's disconnected from the bike? Could be an internal short (bad battery).
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Xumi
San Marcos, CA
'79 XS6502F
'95 VN1500A
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felixs
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Joined: Jun 25, 2007
Posts: 10
Location: 8 deg south

PostPosted: June 27, 2007, 5:39 am    Post subject: Re: voltage drops when off

jayel, you re hinting in the right direction !
the rectifier, not a original xs part, definately works, and
when i disconnect the cable from the alternator, the battery keeps the charge.
i m guessing a short along the cable or in the alternator.
thanks for all your help guys, this is a great site !
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