Eff my life...

[SPLluminator 10+ year member]

Ok, well i just got a new alternator. Now i went to get my new deka Intimidator (that i bought new less that 3 months ago) tested at advance auto parts. Its supposed to be at 800 CCA and it only did 400 something. It didnt pass. We tryed it multiple times. And it would not pass. What could be the problem? The voltage sits at 12.9. This doesn't make any sense to me. Any help?

Could it be that im running with a stock battery without an Isolator? It should still be under warranty so i can prolly get a new one. But still, i dont wanna have the new one have problems. I just spent 175 on an alternator too.

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[thevic24 5,000+ posts]

could be a weak cell in the battery. are you 2 batteries the same type. ie flooded, agm...

 

[basebalz13 10+ year member]

take the battery completely out, trickle charge it over night, then take it back and have it tested not in the car...

 

[SPLluminator 10+ year member]

take the battery completely out, trickle charge it over night, then take it back and have it tested not in the car...

Ok, ill try that. Then i will see what it does. But yes, i have a AGM(rear) and typical flooded battery(front).

 

[gotparts90 10+ year member]

the 2 different types will hurt the higher voltage one, and it looks like it did. get your warranty battery if you can and buy the same one to put up front or run an isolator. When you get the warranty battery its the best time to get a new one for up front then they will match.

 

[SPLluminator 10+ year member]

K, well something is wrong. It can be the battery. Its something to do with the electrical i think. My car is only charging up to 12.4 volts. Unless i give it more gas it stays that low. But when the car is off. The voltage is higher. Like 12.8V. But it cant be the alternator because i just got a new one. I tried without the back battery and it still lowers with the car on. Both batteries sit at 12.8-12.9. So it makes no sense that they would drop to 12.4 with the car on.

 

[SPLluminator 10+ year member]

Anyone have any idea whats wrong? Seriously this is sooo gay

 

[thevic24 5,000+ posts]

what kind of car/truck and what dose it idle at?

 

[john denver 10+ year member]

just because its a new alt. doesn't mean its working properly. You should have it tested as well just to be sure.

 

[SPLluminator 10+ year member]

Well it usually idles at 14.4-5. But now its idling at 12.4.

Also, i got the alt tested and it works properly.

 

[thevic24 5,000+ posts]

Well it usually idles at 14.4-5. But now its idling at 12.4.
Also, i got the alt tested and it works properly.

i ment what rpm dose the car idle at? is it a newer car or like and older ford with a seperate voltage regulator?

 

[SPLluminator 10+ year member]

Idk, it doesnt have an RPM meter. But its a 99 lumina. Im not sure if it has a separate voltage regulator or not but im guessing thats whats wrong.

 

[Supergumby5000 5,000+ posts]

if your car is resting at 12.4ish volts while the car is running, the alternator is not doing its job

 

[SPLluminator 10+ year member]

Well, im wondering if it is the regulator.

 

[SPLluminator 10+ year member]

anybody have ideas?