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    Can a bad/failing battery cause an alternator not to keep up?

    The reason I ask this is I purchased a 200 amp high output alternator that apparently puts those 200 amps out at 1200RPM. I upgraded my wiring to 4 gauge, which should be more than enough for a system that, in the worst case scenario, can draw about 110 amps.

    Now, the problem is my voltage still drops when my amp draws anything more than about 30 amps. It drops harshly when my subs are drawing the most power possible (about 80 amps, accounting for inefficiency of the amplifier). When the subs are maxed the voltage can drop as low as about 10.6V, and it keeps dropping the longer I play the tone.

    Does this mean the high output alternator I bought isn't really high output, or could a bad battery cause the alternator not to be able to flow all of the needed amps through?

    Thanks.



    Head Unit: Stock 2007 Mazda 3
    Front Stage: 6.5" CDT Audio CL-61A-25 Pro Components
    Subwoofers: 2 Sundown Audio SA-8's
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    Re: Can a bad/failing battery cause an alternator not to keep up?

    What amps?



    2014 Ford Fusion
    All stock everything.

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    The two in my sig. At the moment the subs are using under 900 watts.



    Head Unit: Stock 2007 Mazda 3
    Front Stage: 6.5" CDT Audio CL-61A-25 Pro Components
    Subwoofers: 2 Sundown Audio SA-8's
    Front Amp: Hifonics ZXI6010 150Wx2
    Sub Amp: Cadence iA9 2000W

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Quote Originally Posted by HazeGrey75 View Post
    What amps?
    Read his sig retard.



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    Re: Can a bad/failing battery cause an alternator not to keep up?

    What gauge wire are you using?
    And what brand alternator is it?



    Refs : nismos14, Slammed x3, Team H&K, RetroAudioInc, 2002XLT, tc3k101, Fusion_Freak, IAmMurph, louisiana_crx, fast85_gt, Ridnclean x3,
    woofercooker, lil_italy773 x2, 1mtx1, flipx99, MSW Danny, the_greatest_penn, jco1385, walksup, darkhunter139, TurdFurgeuson2, jmanpc, explorer2,
    Jep772, 86yota, fargof, brtnboarder3241, Pitbull12887, Spooney, Phers1er,

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    Sephious's Avatar
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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Quote Originally Posted by silvercookie View Post
    What gauge wire are you using?
    And what brand alternator is it?
    4 gauge with the stock still there, which looks to be about 8 gauge. It's a California Alternator and Starter alt. Figured with the fact that it has a one year warranty and that they actually list the engine RPM it's supposed to put 200 amps out at, I'd be okay with it.

    I've still got a gut feeling it's the battery, unless that's not possible. Dropping to 10V seems like a lot, but then again I've never measured the voltage drop running off the battery alone on any car before. I'm pretty sure the battery is the stock one from when the car was new 5 years ago.



    Head Unit: Stock 2007 Mazda 3
    Front Stage: 6.5" CDT Audio CL-61A-25 Pro Components
    Subwoofers: 2 Sundown Audio SA-8's
    Front Amp: Hifonics ZXI6010 150Wx2
    Sub Amp: Cadence iA9 2000W

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    also what size alternator? and a failing battery can cause alternator not to keep up. that is if you electrical system was beefed up enough to begin with.

    when you exceed the alternators amperage for a brief period, it will draw from battery power. if said battery is failing, then you will be exceeding alternator amperage and have no where tol pull the extra power from.

    what size is your alternator?

    right now your pulling roughly 150-170 amps @ peak amperage draw from the amps, add the vehicles systems radio headlights A/C etc. your looking @ roughly 200-230 maybe a little more. this is why i run an alternator that amperage exceeds my demand, i really don't even need an extra battery.

    so yes if the battery was saving your *** in terms of power availability and the battery is tanking, you will notice.



    FI BTL 18" Fully Loaded
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    Planet Audio BB2400.1
    2 runs of 1/0 Gauge Wire
    Kinetic HC800
    Crappy Pioneer HU
    doing 162db in port, 147db in kickpanel

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Quote Originally Posted by Michael Scott View Post
    also what size alternator? and a failing battery can cause alternator not to keep up. that is if you electrical system was beefed up enough to begin with.

    when you exceed the alternators amperage for a brief period, it will draw from battery power. if said battery is failing, then you will be exceeding alternator amperage and have no where tol pull the extra power from.

    what size is your alternator?

    right now your pulling roughly 150-170 amps @ peak amperage draw from the amps, add the vehicles systems radio headlights A/C etc. your looking @ roughly 200-230 maybe a little more. this is why i run an alternator that amperage exceeds my demand, i really don't even need an extra battery.

    so yes if the battery was saving your *** in terms of power availability and the battery is tanking, you will notice.
    I'm not sure what size the alt is. I just know that it's supposed to put out 200 amps at 1200RPM. It's the same size as the stock one, but seems heavier.

    The sub amp I'm using isn't even close to being maxed. It's only using about 900 watts, if not even a little less than that, so I'm nowhere near 150-170 amps. I'd be closer to that with everything running, including AC and brights. Even then that number is probably a little high. I've clamped my alternator wires and they seem to push no more than about 5 amps together, which seems a little odd to me.

    EDIT: DEERRP. I have an AC clamp. I can't measure DC current, so I can't tell how many amps my alternator is actually pushing.



    Head Unit: Stock 2007 Mazda 3
    Front Stage: 6.5" CDT Audio CL-61A-25 Pro Components
    Subwoofers: 2 Sundown Audio SA-8's
    Front Amp: Hifonics ZXI6010 150Wx2
    Sub Amp: Cadence iA9 2000W

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Quote Originally Posted by silvercookie View Post
    Read his sig retard.
    You can **** my sig..



    2014 Ford Fusion
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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Quote Originally Posted by Sephious View Post
    I'm not sure what size the alt is. I just know that it's supposed to put out 200 amps at 1200RPM. It's the same size as the stock one, but seems heavier.

    The sub amp I'm using isn't even close to being maxed. It's only using about 900 watts, if not even a little less than that, so I'm nowhere near 150-170 amps. I'd be closer to that with everything running, including AC and brights. Even then that number is probably a little high. I've clamped my alternator wires and they seem to push no more than about 5 amps together, which seems a little odd to me.

    EDIT: DEERRP. I have an AC clamp. I can't measure DC current, so I can't tell how many amps my alternator is actually pushing.
    well what symptoms are you having that leads you to believe your having issues? and if the voltage is dropping below 13 @ idle and that's your issue, rev engine above 1000 rpm. most HO's don't really do worth a **** until 1200rpm



    FI BTL 18" Fully Loaded
    6cuFT box after all displacements( spl box 4.79 after displ.)
    Planet Audio BB2400.1
    2 runs of 1/0 Gauge Wire
    Kinetic HC800
    Crappy Pioneer HU
    doing 162db in port, 147db in kickpanel

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Quote Originally Posted by Michael Scott View Post
    well what symptoms are you having that leads you to believe your having issues? and if the voltage is dropping below 13 @ idle and that's your issue, rev engine above 1000 rpm. most HO's don't really do worth a **** until 1200rpm
    Voltage drops to just above 10 volts during a 70Hz tone. This is at above 1200RPM.

    I'm pretty sure the alternator is just garbage and does not do its rated output. I'm probably just going to buy a DC Power Engineering one, as they now list ones for the Mazda 3.



    Head Unit: Stock 2007 Mazda 3
    Front Stage: 6.5" CDT Audio CL-61A-25 Pro Components
    Subwoofers: 2 Sundown Audio SA-8's
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    Sub Amp: Cadence iA9 2000W

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    if big three hasn't been done, that would be a major issue. if it has, sounds like the alternator is taking dump soon. personally i have a 250amp alt. from ebay and it stays @ 13.5-13.8 during all tones at full tilt when revvd to 1000rpm. i would say your battery being bad would be my last guess.

    has big three been done? id so, get a new alt. soon. under voltage is REALLY BAD for an amplifier, eventually will fry it.



    FI BTL 18" Fully Loaded
    6cuFT box after all displacements( spl box 4.79 after displ.)
    Planet Audio BB2400.1
    2 runs of 1/0 Gauge Wire
    Kinetic HC800
    Crappy Pioneer HU
    doing 162db in port, 147db in kickpanel

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    Big 3 has been done. This is a new alt. It's a 200 amp alternator from eBay from California Alternator and Starter.



    Head Unit: Stock 2007 Mazda 3
    Front Stage: 6.5" CDT Audio CL-61A-25 Pro Components
    Subwoofers: 2 Sundown Audio SA-8's
    Front Amp: Hifonics ZXI6010 150Wx2
    Sub Amp: Cadence iA9 2000W

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    i would say alternator is junk, send it back, i went with powermax on ebay. i couldn't be happier with my alternator does rated or super close, case is way bigger and heavier, unless you wanna run duals with your stock and this HO(so called HO) contact the seller and if he gives you ****, call paypal and say it was falsely advertised as a 200 amp alternator and it putting out less than 150 and isn't of any use to you.

    what kind of car is it?



    FI BTL 18" Fully Loaded
    6cuFT box after all displacements( spl box 4.79 after displ.)
    Planet Audio BB2400.1
    2 runs of 1/0 Gauge Wire
    Kinetic HC800
    Crappy Pioneer HU
    doing 162db in port, 147db in kickpanel

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    Re: Can a bad/failing battery cause an alternator not to keep up?

    your running 4 guage to your amp, thats a problem 2, it needs 0 guage required




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