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voltage issue

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Started by On3Hundr3dProof, Jan 04 2012 05:15 PM

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30 replies to this topic

#1
On3Hundr3dProof
Posted 04 January 2012 - 05:15 PM

On3Hundr3dProof

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I've been having some issues with the voltage in my truck. When i start it it will be around 14.0v-14.5v but after about a minute without playing any music it will drop to about 12.2v and roam between 12v-13v. I dont get any voltage drop when playing music either(maybe .1v-.2v drop but thats normal) if anything it will go back up just a little. Any insight/advice would be greatly appreciated.

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#2
Frostedflakejake
Posted 04 January 2012 - 05:20 PM

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How did you measure voltage? Try it with two different meters to see if they are the same.

I'm assuming your alternator isn't outputting enough. When you turn your car on, it's cold, and the RPM is higher, right? Around... 1300rpm? 1000 rpm?
And then after a or so it drops to something like 600-800rpm correct?

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#3
shizzzon
Posted 04 January 2012 - 05:20 PM

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pull ALL batts out.. If you got more than one, then when you pull them out, let them rest for a good couple hrs.

Then measure voltage of each battery independently.

Let us know the resting voltage.
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#4
bigjon
Posted 04 January 2012 - 05:25 PM

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check for a bad cell,. you can disconnect each leave your starting battery if you have more then 1 take it to autozone they can load test the batteries in your car, and also check your alternator for faults.

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#5
On3Hundr3dProof
Posted 04 January 2012 - 05:28 PM

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just pulled it out and measured and its sitting at 12.8. will measure again in a bit.

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#6
On3Hundr3dProof
Posted 04 January 2012 - 05:31 PM

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before i put the kinetik in it would like to start at 14.4 and drop to 13.1 and stay there, but dropping to 12.0 and wandering between mostly 12.0-12.6 seems fishy.

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#7
stefanhinote
Posted 04 January 2012 - 05:32 PM

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    what are these ohms you people talk about?

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Sounds like your alternator is only working for a few minutes when you start it and have it running (14v), then after a few minutes your alt stops and voltage drops down to the batteries' resting voltage.

Do you have a stock alt or aftermarket? If aftermarket, did you have to manually wire in the remote turn on?
2002 volvo v40
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#8
B_Gizzle
Posted 04 January 2012 - 05:36 PM

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Do you have a newer chevy truck?

#9
On3Hundr3dProof
Posted 04 January 2012 - 05:36 PM

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Sounds like your alternator is only working for a few minutes when you start it and have it running (14v), then after a few minutes your alt stops and voltage drops down to the batteries' resting voltage.

Do you have a stock alt or aftermarket? If aftermarket, did you have to manually wire in the remote turn on?


stock alt. @ 12.8 resting voltage the batt should be fully charged right? is it possible my alt is cutting off because of this?

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#10
On3Hundr3dProof
Posted 04 January 2012 - 05:37 PM

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Do you have a newer chevy truck?


2010 Nissan Frontier

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#11
stefanhinote
Posted 04 January 2012 - 05:40 PM

stefanhinote

    what are these ohms you people talk about?

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Sounds like your alternator is only working for a few minutes when you start it and have it running (14v), then after a few minutes your alt stops and voltage drops down to the batteries' resting voltage.

Do you have a stock alt or aftermarket? If aftermarket, did you have to manually wire in the remote turn on?


stock alt. @ 12.8 resting voltage the batt should be fully charged right? is it possible my alt is cutting off because of this?


12.8 is good, I don't see why the alt would turn off because of this.

It also seems unlikely that a near brand new alt would go out so early. Guessing not too many miles?

With all the batteries disconnect, except for the starting battery, it idles around 13v? Then with the extra(s) in the rear, it idles at 12v?
2002 volvo v40
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#12
On3Hundr3dProof
Posted 04 January 2012 - 05:43 PM

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Sounds like your alternator is only working for a few minutes when you start it and have it running (14v), then after a few minutes your alt stops and voltage drops down to the batteries' resting voltage.

Do you have a stock alt or aftermarket? If aftermarket, did you have to manually wire in the remote turn on?


stock alt. @ 12.8 resting voltage the batt should be fully charged right? is it possible my alt is cutting off because of this?


12.8 is good, I don't see why the alt would turn off because of this.

It also seems unlikely that a near brand new alt would go out so early. Guessing not too many miles?

With all the batteries disconnect, except for the starting battery, it idles around 13v? Then with the extra(s) in the rear, it idles at 12v?


22k on the truck and only one kinetik 1800 in the front no other batts

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#13
stefanhinote
Posted 04 January 2012 - 05:47 PM

stefanhinote

    what are these ohms you people talk about?

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Sounds like your alternator is only working for a few minutes when you start it and have it running (14v), then after a few minutes your alt stops and voltage drops down to the batteries' resting voltage.Do you have a stock alt or aftermarket? If aftermarket, did you have to manually wire in the remote turn on?

stock alt. @ 12.8 resting voltage the batt should be fully charged right? is it possible my alt is cutting off because of this?

12.8 is good, I don't see why the alt would turn off because of this.It also seems unlikely that a near brand new alt would go out so early. Guessing not too many miles?With all the batteries disconnect, except for the starting battery, it idles around 13v? Then with the extra(s) in the rear, it idles at 12v?

22k on the truck and only one kinetik 1800 in the front no other batts


before i put the kinetik in it would like to start at 14.4 and drop to 13.1 and stay there, but dropping to 12.0 and wandering between mostly 12.0-12.6 seems fishy.



So when you say before, do you mean: stock battery, idling, 13v. Then swapped out for kinetik, idle and 12v?
2002 volvo v40
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#14
On3Hundr3dProof
Posted 04 January 2012 - 05:50 PM

On3Hundr3dProof

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Sounds like your alternator is only working for a few minutes when you start it and have it running (14v), then after a few minutes your alt stops and voltage drops down to the batteries' resting voltage.Do you have a stock alt or aftermarket? If aftermarket, did you have to manually wire in the remote turn on?

stock alt. @ 12.8 resting voltage the batt should be fully charged right? is it possible my alt is cutting off because of this?

12.8 is good, I don't see why the alt would turn off because of this.It also seems unlikely that a near brand new alt would go out so early. Guessing not too many miles?With all the batteries disconnect, except for the starting battery, it idles around 13v? Then with the extra(s) in the rear, it idles at 12v?

22k on the truck and only one kinetik 1800 in the front no other batts


before i put the kinetik in it would like to start at 14.4 and drop to 13.1 and stay there, but dropping to 12.0 and wandering between mostly 12.0-12.6 seems fishy.



So when you say before, do you mean: stock battery, idling, 13v. Then swapped out for kinetik, idle and 12v?


the stock batt started at 14.4 then after a min would go down to 13.1 and stay there. after i put the kinetik in it would start at 14.4-14.6 and stay there the whole time.

2010 Nissan Frontier

2 15" Memphis MOJO CMs, Sundown SAZ-3500v.2, DC Power 270XP, XS D5100R, 2 XS XP3000, 2 runs weldingsupply 2/0, Big 3, Alpine CDA-105, Alpine KTP-445, Memphis Mclass 6.5s and 6x9s


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#15
stefanhinote
Posted 04 January 2012 - 05:52 PM

stefanhinote

    what are these ohms you people talk about?

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I heard of this being done on older vehicles, but not sure if it could present a problem on a vehicle as new as yours, but:

If you were to loosen the ground terminal on the battery, start the truck, let it idle for a few minutes until your seeing that low voltage, then lift the ground terminal off the battery post and hold it.
If the truck dies, your alternator isn't charging.

Hopefully someone can chime on this.
2002 volvo v40
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