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  #1  
Old 10-16-2013, 04:22 PM
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Default Voltage issue?

I can't figure it out... I have an 07 charger with 3 batteries... Just got a voltmeter and it shows 11.3 when the car is off and 13.0 when the car is on.

Voltage drops significantly when the car is off and around 500rms is played for maybe 5 minutes, however there is no voltage drop while the car is on and playing.

Is this a regulator issue? The batteries and alt were tested at autozone and showed they're all working as intended

Any help would be appreciated
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Old 10-16-2013, 06:06 PM
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When your car is off, the alternator is as useful as a brick. Even less, actually. Your amps use power, and your batteries cannot keep supplying it with no drop. I don't play mine with the engine off for that reason; old habits die hard. Your batteries may not have the storage capacity to keep going like this. Excessive draw may fry them quicker. Try to use good AGM power cells, they are more forgiving when it comes to charge/discharge cycles compared to a regular wet cell.
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Old 10-16-2013, 06:26 PM
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Did u check your voltage at Batts with a dmm and set with the digital voltage gauge?
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Old 10-16-2013, 10:03 PM
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Quote:
Originally Posted by Sykotic101 View Post
When your car is off, the alternator is as useful as a brick. Even less, actually. Your amps use power, and your batteries cannot keep supplying it with no drop. I don't play mine with the engine off for that reason; old habits die hard. Your batteries may not have the storage capacity to keep going like this. Excessive draw may fry them quicker. Try to use good AGM power cells, they are more forgiving when it comes to charge/discharge cycles compared to a regular wet cell.
Thanks for the explanation. I have three batteries however and they drain incredibly fast even when there is no amp on. The batteries seem to settle around 11.1v after a while

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Originally Posted by phatryan69 View Post
Did u check your voltage at Batts with a dmm and set with the digital voltage gauge?
No I haven't used my multimeter, but how do I go about setting the digital voltmeter?



Thanks for the help so far guys
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Old 10-17-2013, 05:36 AM
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The fact that your voltage settles at a very low 11.1v shows at least one bad battery. A typical car battery should not settle below 12.4-12.5v. I once had an Optima Red top th t settled at 12.2, but still did the job, though. Start taking them out of the loop, one at a time. Take them to a local AutoZone, or have them tested with a carbon pile load tester. I'm willing to bet that at least one of the batteries has a dead cell, hence the low voltage. The bad news it that once one goes, it usually drags the rest with it if they are not isolated.
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Old 10-17-2013, 08:34 AM
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depending on if your gauge has an adjustment on the back of it. which ever battery u have it tied with check that with the DMM and then set the gauge with what the DMM says and u should be good to go.. and as far as a a dead cell idk just one of them things. trial and error my friend ull get it
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Old 10-17-2013, 09:16 AM
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Quote:
Originally Posted by phatryan69 View Post
depending on if your gauge has an adjustment on the back of it. which ever battery u have it tied with check that with the DMM and then set the gauge with what the DMM says and u should be good to go.. and as far as a a dead cell idk just one of them things. trial and error my friend ull get it
You are correct on the adjustment, since at 11.1 the car would be difficult to start. On a hot Chrysler OEM alternator 13.0 is a bit low, should be 13.5-13.8, IIRC. The triple battery bank should not drop below 12.5 with the engine off, either.

What concerns me is that he is still seeing a no-load 2 volt drop from when the car is running. My electrical is in my sig line; hot idle is at 13.9, no significant load. Engine off, no load, my voltage is steady at 12.7-12.8. I went over it wit a DMM multiple times just to make sure.
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Old 10-17-2013, 01:30 PM
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Quote:
Originally Posted by Sykotic101 View Post
You are correct on the adjustment, since at 11.1 the car would be difficult to start. On a hot Chrysler OEM alternator 13.0 is a bit low, should be 13.5-13.8, IIRC. The triple battery bank should not drop below 12.5 with the engine off, either.

What concerns me is that he is still seeing a no-load 2 volt drop from when the car is running. My electrical is in my sig line; hot idle is at 13.9, no significant load. Engine off, no load, my voltage is steady at 12.7-12.8. I went over it wit a DMM multiple times just to make sure.
i dont have any voltage drop when the car is on. It never budges from 13.0v when the car is on. i will however start checking each batt with a mm to see if i have dead cells. thanks for the advice. yall are a huge help

Quote:
Originally Posted by phatryan69 View Post
depending on if your gauge has an adjustment on the back of it. which ever battery u have it tied with check that with the DMM and then set the gauge with what the DMM says and u should be good to go.. and as far as a a dead cell idk just one of them things. trial and error my friend ull get it
when i get home ill see if there's an adjustment on the back, but from memory i don't believe that there is an adjustment :/
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Old 10-17-2013, 01:42 PM
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You may not be able to identify a dead cell with a DMM. You will need a load tester for that; most battery woes cannot be found without a load. Try taking them out, and having AutoZone test them independently. That's the only way you will be able to isate and identify a problem.

The worst thing about having a battery bank is that if not isolated, a bad cell is like a bottomless hole that the other cells/batteries keep trying to charge, but can't. It eventually kills the good ones, too.
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Last edited by Sykotic101; 10-17-2013 at 01:44 PM. Reason: Spelling on a dumbphone. :)
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Old 10-17-2013, 02:27 PM
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Definitely have each battery checked individually. Resting at 11V is an almost garauntee that something has failed. Its happened to me a couple of times and the second a load hits, they were dropping off something awful. Check and recheck all your grounds too because that could pose a problem. I have said," yea, yea, all my connections are good", then turns out that something was loose. Hope you identify your issue. It can be a headache.
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