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Old 02-05-2004, 07:54 PM   #1
Scooby Specialist
Member#: 5796
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Moonshineville
2013 BRZ & 2004

Default Voltage troubles............

Ok so for some time now i have been having voltage troubles........it got to the point where even while driving and in gear, the car would only make about 11.5 volts, then eventually the battery died.
so i replaced it w/a optima red...........went great for about 2 months, now i got the problem again, when i first put the optima in, crusing was about 13.6 volts and idle about 12.0 but now just driving i was making 11.5 volts, so i turned off the heat, and the voltage went up to about 12.5 but in about 2 min settled back to 11.5, so i turn off the lights, same stuff.
any ideas, i do have GFB pulleys and a lightweight flywheel and a stereo system w/an amp, but its a 5 ch. mtx making about 500 watts and i have a monster half farad cap.
maybe a new alternator?, maybe a heavier duty alternator?

thanks guys
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Old 02-06-2004, 01:06 AM   #2
North Ursalia
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Oct 1940 - Feb 2008

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Member#: 809
Join Date: Jan 2000
Chapter/Region: NESIC
Location: NH, Land Of Many Trees
2000 2.5 RS, '14 For
92 5MT SVX


It could be your voltage regulator in your alternator as well. Then again, 500 watts and pulleys probably aren't helping the matter any.


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Old 02-06-2004, 10:43 AM   #3
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Member#: 16495
Join Date: Mar 2002
Chapter/Region: South East
Location: Jacksonville
2013 BRZ
Sterling Silver Metallic


I have seen 2 cars with voltage problems related to the GFB pulley kit. It changes the design speed of the alternator.

Remove just the alt pulley and see what your voltage holds at cruise,

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