HiGh VoLtAgE!!! - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 40 (permalink) Old 11-01-2012, 04:31 PM Thread Starter
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HiGh VoLtAgE!!!

When I first start my car it reads 14.3 volts as I drive it gets higher,and eventually it hits 16 and goes back down to 15.8. But the issue is this, it keeps bouncing from 15.8 up over 16 and back to 15.8. If I shut car off and restart it will be fine until it gets back up over 16 then it resumes the 15.8/16.# bounce. Im thinking the battery is on its way out so the alternator is overworking

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post #2 of 40 (permalink) Old 11-01-2012, 05:02 PM
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Sounds more like the voltage regulator is shot causing the voltage to go crazy high. I'd personally get the alternator tested, Load test the battery as well.

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post #3 of 40 (permalink) Old 11-01-2012, 06:01 PM
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What are you measuring this with?

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post #4 of 40 (permalink) Old 11-01-2012, 09:00 PM Thread Starter
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My voltage meter in my pillar pod. Haven't had a chance to check it with my volt meter.

2006 Cobalt ls,18" motegi rims,eibach extreme spring,koni yellows,real carbon fiber bolt on hood with scoop,redline spoiler,projector halo headlights,20% tint,carbon fiber bowties,custom carbon fiber dash kit,carbon fiber side mirrors, k&n typhoon cai ,full magnaflow exhaust with pacesetter header,twm short throw shifter,rzo weighted shift knob,ac delco iridium plugs,3 gauge pillar with a/f ratio,oil pressure,volt meter,alpine ina-w19 dd touch,everything else alpine as well.
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post #5 of 40 (permalink) Old 11-02-2012, 05:18 AM
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I would check your gauge too.

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post #6 of 40 (permalink) Old 11-02-2012, 08:59 AM
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Good morning cobalistix,

I see that you've gotten some great feedback already on the voltage concern you have; if you decide to work with a GM dealership on getting this checked into further please let me know as I want to be available to check into this further with you.

Regards,
Sarah
GM Customer Service
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post #7 of 40 (permalink) Old 11-02-2012, 10:07 AM Thread Starter
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No disrespect but I stay as far away from the stealership as possible! Even if I buy a new alternator and install it myself it would be cheaper then the diagnostic fee.

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post #8 of 40 (permalink) Old 11-02-2012, 11:22 AM
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What is your voltage meter connected to?

Do you have any blown fuses? Or any other electrical anomalies? I don't see a problem here unless there are other issues than your voltage meter reading high or fluctuating.

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post #9 of 40 (permalink) Old 11-02-2012, 01:03 PM Thread Starter
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Ignition on current,which is my wiper fuse. then grounded to block. No other electrical issues what so ever.

2006 Cobalt ls,18" motegi rims,eibach extreme spring,koni yellows,real carbon fiber bolt on hood with scoop,redline spoiler,projector halo headlights,20% tint,carbon fiber bowties,custom carbon fiber dash kit,carbon fiber side mirrors, k&n typhoon cai ,full magnaflow exhaust with pacesetter header,twm short throw shifter,rzo weighted shift knob,ac delco iridium plugs,3 gauge pillar with a/f ratio,oil pressure,volt meter,alpine ina-w19 dd touch,everything else alpine as well.
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post #10 of 40 (permalink) Old 11-02-2012, 01:07 PM
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Quote:
Originally Posted by cobalistix View Post
Ignition on current,which is my wiper fuse. then grounded to block. No other electrical issues what so ever.
try connecting a DMM right to you battery while car is running. You'll get a better idea of voltage.

---------- Post added at 03:07 PM ---------- Previous post was at 03:05 PM ----------

voltage will be higher when car is running, generally above 13 (13.4-13.6) which is normal. Of course it will go down if you have a high-power audio system or lots of accessories running off the car's power.

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