Alternator bad??
Thread Starter
Burning Brakes
Joined: Jun 2013
Posts: 1,186
Likes: 16
From: Orlando Fl
Alternator bad??
Battery check good at auto zone 94% charge 720 CCA
Alt reads only 12.2 output and battery reads 12.2 with car one or off. Before I buy a new alt could it be anything else?
Alt reads only 12.2 output and battery reads 12.2 with car one or off. Before I buy a new alt could it be anything else?
Pro
Joined: May 2006
Posts: 582
Likes: 74
From: Colonial Beach Virginia
With the car running at 1500rpm or more, you should be putting out 14.4 volts or so. Not 12.2 volts. Even with a bad battery, (or no battery at all), your alternator output should be reading 14.4 volts at the battery connections. If you have a grounded plate in your battery, you could suck down your voltage a bit. Sounds like alternator to me.
Rev up the car with a multi-meter attached to the battery cables. Does the voltage go up? If all else fails, remove your alternator and have it tested at Autozone
Rev up the car with a multi-meter attached to the battery cables. Does the voltage go up? If all else fails, remove your alternator and have it tested at Autozone
Last edited by Redhook98; Mar 17, 2015 at 10:33 AM.
Thread Starter
Burning Brakes
Joined: Jun 2013
Posts: 1,186
Likes: 16
From: Orlando Fl
Auto Zone said alternator too and the battery is reading the same as the alt output because it wont charge it any more. With the car running I put the millimeter at the alt and it reads 12.2 output. I see 12.2 ish on he DIC while driving. My other C5 reads 13.8 to 14 while driving. Sounds like its time for a new alt. Any advice on the best place to get one?
Millimeter readings
Car off
Batt is 12.2
Car on
Alt is 12.2
Batt is 12.2
Millimeter readings
Car off
Batt is 12.2
Car on
Alt is 12.2
Batt is 12.2
Last edited by Sirk17; Mar 17, 2015 at 10:58 AM.
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Pro
Joined: May 2011
Posts: 580
Likes: 1
From: Chicago Suburb
St. Jude Donor '13
New alternator
) alternators before they get one that works with their car.
Pro
Joined: Apr 2005
Posts: 503
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From: HAVERTOWN PA
Thread Starter
Burning Brakes
Joined: Jun 2013
Posts: 1,186
Likes: 16
From: Orlando Fl
Just put in a Duralast I picked up and its DOA 11.9 volts at the alt. I took a known good alt out of my other Z06 and boom 14 volts at the battery.
What a piece of ****. time to go take this piece back.
What a piece of ****. time to go take this piece back.
Thread Starter
Burning Brakes
Joined: Jun 2013
Posts: 1,186
Likes: 16
From: Orlando Fl
So I just tried a second alt from auto zone and the same thing happened. I even had them test it before I left. I think the issue is the alt is not "talking" correctly with the PCM. Looks like ill be buying an OE replacement. Nothing like a 400 dollar alternator.
Thread Starter
Burning Brakes
Joined: Jun 2013
Posts: 1,186
Likes: 16
From: Orlando Fl
I just ordered part number #10316182 Delco OEM New replacement which is the new part number for my original 10246634. I might have the stocker rebuild and keep it on the shelf. Wish me luck....OG and amazon prime for the win!!!! $290 buck 2 day shipping...
Thread Starter
Burning Brakes
Joined: Jun 2013
Posts: 1,186
Likes: 16
From: Orlando Fl