Stock Volt Gauge
03-19-2006, 12:57 PM
#1
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Stock Volt Gauge I put an Optima red top in my car a few weeks ago and now every once in a while my volt gauge will dip to just below 13 for a couple seconds, then bounce right back to normal. Sometimes happens when cold (thinking air pump cycling maybe?) but sometimes when fully warm at 50 MPH. Never did it before - does this mean I'll be buying a new alternator soon? Car only has 23K on the clock.
03-19-2006, 01:54 PM
#2
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no its does that when im sitting at a stop light for awhile waiting for it to change, but only does it at night when my headlight and all that is on. A4 have a low idle and when sitting there the volts will go down b/c of the low idle, im planning on getting a ASP underdrive pulley along with there overdrive pulley to see if that helps out the volt issue.
03-19-2006, 02:38 PM
#3
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So maybe I'm just seeing the voltage regulator working through the gauge? Shouldn't be an idle problem for me, my in gear idle is set to 760. I might try removing the air pump fuse for a few days and see what happens - if it doesn't stop at least I can eliminate the pump draw.
03-19-2006, 03:13 PM
#5
TECH Senior Member
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No system, only thing extra is two small LEDs wired to my SLP fan switch so I can tell when the fans are on - they're working fine with the car on or off. Maybe I'm just being paranoid and never noticed it before. 
