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Discussion Starter · #1 ·
So I have a 09 cts v ran into a problem with the old alternator draining the battery got a new alternator installed and also got a new battery installed yesterday the main problem I'm facing is that it's not charging the system like it's supposed to I know it's hard to trying to assess a problem that you can't look at.

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Discussion Starter · #3 ·
I checked all of them and they are hooked up properly only thing I could think of is the generator cable could be bad on the alternator.

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Could be a bad cable, I've also personally had a starter wire with dirty terminals cause charging system faults. Check charge rate with a DMM at the alternator, and at the battery. What's the voltage at on the cluster?
 

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Discussion Starter · #5 ·
Craziest thing I had the battery sit at 11.7 then 12 and then it just started to drop over time now its doing the same thing from Saturday where it's losing juice within 5-10 mins of it running.

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Charging system (alternator) should be charging at about 14.4v. Battery should be at 12.2v for proper testing.
Like others have recommended if you have a multimeter check output voltage at the alternator. You should have that same reading at your battery. If not there's a cable issue some where.
 

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That’s not crazy that’s a short. Either a wiring issue or a faulty component.
First thing to consider is what work was recently done? It is very common that shorts or parasitic drain can be traced to recent work and pinched wires. Stereo installed? Replaced some other item? Removed/installed seats, upholstery, dash panels?


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Discussion Starter · #8 ·
But the alternator is new so it shouldn't be bad already especially since it's only been on the car for 24 hours.

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Listen to what MrSurly had to say and report back.
Most likely your going to need some common knowledge of DC electrical troubleshooting and a meter to get through this one. Don't throw anymore parts at it until you have identified the root cause of your issues.
Just my .02
 

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Discussion Starter · #10 ·
Got ya I just picked up a multimeter so definitely look at it tomorrow.

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Discussion Starter · #11 ·
That’s not crazy that’s a short. Either a wiring issue or a faulty component.
First thing to consider is what work was recently done? It is very common that shorts or parasitic drain can be traced to recent work and pinched wires. Stereo installed? Replaced some other item? Removed/installed seats, upholstery, dash panels?


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I haven't had any recent work done on it.

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Discussion Starter · #15 ·
What is the charging voltage on the DIC say? Should be 14.2-14.4vdc.
Checked it last night and it had nothing on it and I checked the battery it read 10.98 I was thinking of tapping the white and running a test wire to the positive terminal to see if it would charge that way.

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Got it from oriellys

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These cars are finicky about aftermarket alternators so if it's not an OEM alternator, that could be your issue.
 
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Checked it last night and it had nothing on it and I checked the battery it read 10.98 I was thinking of tapping the white and running a test wire to the positive terminal to see if it would charge that way.

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Engine must be running to see charging voltage in the DIC.
At this point I would not recommend you start tapping/running test wires as if something shorts or goes wrong it cold cost you a hell of a lot more in repairs.
10.98, battery is to low.
 

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Discussion Starter · #18 ·
Engine must be running to see charging voltage in the DIC.
At this point I would not recommend you start tapping/running test wires as if something shorts or goes wrong it cold cost you a hell of a lot more in repairs.
10.98, battery is to low.
Well only option I can think of is seeing if I can get another battery from orielly's and start it that way to test it.

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Discussion Starter · #19 ·
These cars are finicky about aftermarket alternators so if it's not an OEM alternator, that could be your issue.
Yea its a Ultima alternator since they said the ac Delco would be special order.

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Yea its a Ultima alternator since they said the ac Delco would be special order.

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I recommend getting the AC Delco.
 
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