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Old 06-13-2012, 10:47 AM   #1
jp_costarica
 
Drives: Yaris sedan 2007
Join Date: Jun 2012
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LOW RPM @Idle speed = Bad Volt Generation?

Hi, I am having troubles with Bat charging. I have 2 weeks driving with 10.8 to 11.5 volts (~70-80% Battery level). I chech my alternator and its working rarely, in some times at low rpm lights start blinking (high ripple voltage). But also, I have noticed Low RPM when car is at idle speed (~400 - 600rpm) are this normal? Anyone knows what is the minimun rpm alternator, to supply 13.8V? Thanks, /jp

Last edited by jp_costarica; 06-13-2012 at 11:06 AM.
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Old 06-13-2012, 11:20 AM   #2
bronsin
 
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I think an alternator pretty much put out 13-14 v even at idle.

Can you have your battery tested under load at a shop?
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Old 06-13-2012, 11:40 AM   #3
ViosFan
 
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Id try and get your battery tested, I think i saw something saying Auto Zone does free battery testing.
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Old 06-14-2012, 02:44 PM   #4
jp_costarica
 
Drives: Yaris sedan 2007
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Hi All,
I applied the Batt's Garantee, but still with my doubt. I'll have to wait time to probe this, because I have no time to do more testing.

Check this:

-At iddle speed, voltage on batt terminal is 13.5 (same value adding A/A and lights)
-At 2000-5000 rpm, voltage ups to 13.7

Anyone have anysimilar conditions?.m Are this paramethers inside normal operation?
My alternator is a NM toyota Denso.

thanks any RE:

/jp
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Old 06-14-2012, 04:56 PM   #5
09sedan
 
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Your alternator output is a bit low, try replacing with a new battery and check your ground connections, if that doesnt help replace alternator.
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