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Reload Thread: voltage question... is 13.7-13.9V normal for some cars?

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    voltage question... is 13.7-13.9V normal for some cars?

    i have an 07 scion tc....

    does anyone elses car seem to not ever put out anywhere near 14.4 volts normally? like the only time i've ever seen it at 14.4 is when i first start the car in the morning. and by the time i get to work which is about 15 minutes(10 miles) away it's down to about 13.6-13.9v.

    also when i'm parked or stopped at a stoplight the voltage is always between 13.2-13.5. i know it's not extremely low but why is it never at 14.4 steadily? i do have a subwoofer with an amp that does 800watts rms but my voltage never drops more than .3 volts when it's at full tilt. the voltage in general just doesn't seem very high.

    once again... this is on a brand new 07 scion tc that i bought in august.



    07 Scion tC: 880PRS, ID OEM 6.5" mids, Seas neo alum tweets, DD S4 and DD C2a amps, Dayton Ref H.O. 10(.7net, tuned to 30hz)

    HT: Samsung PN58B560 - 80gig PS3 - Yamaha RX-V2500 - Infinity Alpha 50 mains - Alpha center - Harmon Kardon HKB6 rears, Epik Sentinel & ED eQ.2.




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    yeah thats normal.




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Yep.. that's completely normal. Could be the ****** stock wiring.. Try doing the big 3, it'll give you less resistance so voltage won't drop from alt to battery. That's how mine was. Otherwise 13.8 is just what your alternator is regulated to.




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    anything i can do to get it to 14.0-14.4 volts all the time?



    07 Scion tC: 880PRS, ID OEM 6.5" mids, Seas neo alum tweets, DD S4 and DD C2a amps, Dayton Ref H.O. 10(.7net, tuned to 30hz)

    HT: Samsung PN58B560 - 80gig PS3 - Yamaha RX-V2500 - Infinity Alpha 50 mains - Alpha center - Harmon Kardon HKB6 rears, Epik Sentinel & ED eQ.2.

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    Re: voltage question... is 13.7-13.9V normal for some cars?

    i believe vehicles are mostly regulated between 13.6 - 14.4 or so... give or take a few tenths...




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Quote Originally Posted by jacka View Post
    Yep.. that's completely normal. Could be the ****** stock wiring.. Try doing the big 3, it'll give you less resistance so voltage won't drop from alt to battery. That's how mine was. Otherwise 13.8 is just what your alternator is regulated to.
    the stock wiring actually looks good, looks like 6 gauge maybe.



    07 Scion tC: 880PRS, ID OEM 6.5" mids, Seas neo alum tweets, DD S4 and DD C2a amps, Dayton Ref H.O. 10(.7net, tuned to 30hz)

    HT: Samsung PN58B560 - 80gig PS3 - Yamaha RX-V2500 - Infinity Alpha 50 mains - Alpha center - Harmon Kardon HKB6 rears, Epik Sentinel & ED eQ.2.

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    Re: voltage question... is 13.7-13.9V normal for some cars?

    i believe your toyota is regulated lower then that... would have to change the regulator... either an external unit, or internal to the pcm or alt.... You will need someone who knows more about toyota to answer this one...




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Quote Originally Posted by tcguy85 View Post
    the stock wiring actually looks good, looks like 6 gauge maybe.
    Well, mine was ~4 gauge and voltage never got above 13.98. Did the Big 3 and now it's about 14.3. Was either ****** stock wiring, or ****** stock connections, or a combination of both.




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Quote Originally Posted by jacka View Post
    Well, mine was ~4 gauge and voltage never got above 13.98. Did the Big 3 and now it's about 14.3. Was either ****** stock wiring, or ****** stock connections, or a combination of both.
    so i should do the big three in 0 gauge?



    07 Scion tC: 880PRS, ID OEM 6.5" mids, Seas neo alum tweets, DD S4 and DD C2a amps, Dayton Ref H.O. 10(.7net, tuned to 30hz)

    HT: Samsung PN58B560 - 80gig PS3 - Yamaha RX-V2500 - Infinity Alpha 50 mains - Alpha center - Harmon Kardon HKB6 rears, Epik Sentinel & ED eQ.2.

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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Quote Originally Posted by tcguy85 View Post
    so i should do the big three in 0 gauge?
    you should.






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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Quote Originally Posted by kcdc30 View Post
    you should.
    ok, i just didn't think it was necessary since i only have 800 watts and my voltage barely drops. .3 volts is a pretty small drop at full tilt right?



    07 Scion tC: 880PRS, ID OEM 6.5" mids, Seas neo alum tweets, DD S4 and DD C2a amps, Dayton Ref H.O. 10(.7net, tuned to 30hz)

    HT: Samsung PN58B560 - 80gig PS3 - Yamaha RX-V2500 - Infinity Alpha 50 mains - Alpha center - Harmon Kardon HKB6 rears, Epik Sentinel & ED eQ.2.

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    Re: voltage question... is 13.7-13.9V normal for some cars?

    Quote Originally Posted by tcguy85 View Post
    ok, i just didn't think it was necessary since i only have 800 watts and my voltage barely drops. .3 volts is a pretty small drop at full tilt right?
    you probably don't have to, but the small effort it takes to do the big 3 should really be done anyway. just my opinion.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

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    Re: voltage question... is 13.7-13.9V normal for some cars?

    ok how many feet of 0 gauge should it normally take? it's just batt + to alt, batt - to frame and engine to frame right? so maybe 8ft? i should have all 3 as short as possible right?



    07 Scion tC: 880PRS, ID OEM 6.5" mids, Seas neo alum tweets, DD S4 and DD C2a amps, Dayton Ref H.O. 10(.7net, tuned to 30hz)

    HT: Samsung PN58B560 - 80gig PS3 - Yamaha RX-V2500 - Infinity Alpha 50 mains - Alpha center - Harmon Kardon HKB6 rears, Epik Sentinel & ED eQ.2.

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    Re: voltage question... is 13.7-13.9V normal for some cars?

    yes as short as you can and 8 feet will probably be more then enough....




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    Re: voltage question... is 13.7-13.9V normal for some cars?

    I'm pretty positive toyota (Scion/lexus) all are regulated att 13.8, my lexus is at 13.8v and I even have a HO alt installed. Big 3 had nothing to do with it (doing big 3 did help voltage drops) but the regulator is set at 13.8v

    When u start the engine it's usually at 14.4v's tho, once it warms up it drops down to 13.8v



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