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  1. #31
    gamehawk55's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by mat3833 View Post
    if you have a DMM do this for me:

    run a wire from the battery ground to where your trunk ground is. measure the resistance of that peice of wire and write that number down. now take that wire and your DMM. put the + probe on the ground in your trunk and the - side on the wire, read the resistance. if the second number is any more than .1 higher(honestly you should aim for .01 if your DMM reads that low) you have a ****** ground.

    Matt
    Does it have to be a 4ga or 0ga wire?. Cuz if it does that aint gonna happen because i don't have 20ft of any power/ground wire. I dont think i have 20ft of ANY wire atm.



    Vehicle: 2007 Pontiac G6 GT
    Head Unit: Kenwood DDX419
    Speakers: Focal PS165 Components
    Distribution: Knukonceptz KNF-60 Power/Ground Distribution block
    Amps: Audioque 200.2, Rockford Fosgate T2500-1BDCP
    Subs: 2 SA-8v2 D2 wired @2ohms in custom ported box tuned to 34-35hz
    Wiring: All 1/0 Gauge SHOK Wire and Knukonceptz wire + BIG 3
    Alternator: Singer 310A 6 Phase High Output Alternator




  2. #32
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    Re: Massive voltage drop at amp but not at battery? Help

    Let me get this straight, OP is running a 3K amp off of stock electrical and we're debating wire gauge as a cause of voltage drop?




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  4. #33
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by gamehawk55 View Post
    Does it have to be a 4ga or 0ga wire?. Cuz if it does that aint gonna happen because i don't have 20ft of any power/ground wire. I dont think i have 20ft of ANY wire atm.
    i use 12 ga for the test. doesnt matter what kind of wire you use, just make sure to measure the resistance of it before you do the test.

    Quote Originally Posted by hispls View Post
    Let me get this straight, OP is running a 3K amp off of stock electrical and we're debating wire gauge as a cause of voltage drop?
    NO. obvioisly you havent read a **** thing, his voltage is dropping ONLY at the amps. not the battery. this means something isnt right, either a bad connection or ground or something. im trying to walk him through a few ways to find out if his grounds are solid as well as eliminating the distro as a problem.

    Matt



    Star Mountain Nuthugger #5
    12" TC9 in 1.39 cubes @30hz
    Boston Acoustics GT-2300 @4 ohms bridged.

    Quote Originally Posted by double 07 View Post
    Sub cutout got a little skar on it...dad blamed round over bit bearing came flying off.......LOL.......
    Quote Originally Posted by gckless View Post
    A little Skar on it? Was it a B-stock bit?
    Refs:
    bought from Nitefury360, Tallic, SPLaudio X2
    Traded with Marleyskater420

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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by mat3833 View Post
    i use 12 ga for the test. doesnt matter what kind of wire you use, just make sure to measure the resistance of it before you do the test.



    NO. obvioisly you havent read a **** thing, his voltage is dropping ONLY at the amps. not the battery. this means something isnt right, either a bad connection or ground or something. im trying to walk him through a few ways to find out if his grounds are solid as well as eliminating the distro as a problem.

    Matt
    Well I haven't been able to do the wire test yet because I'm working but I was able to check the resistance of the grounds up front and in the rear and all read 0.2-0.3ohms resistance which would suggest that the grounds are good. And the amp GETS the same voltage as what is read up front. Minus like a tenth of a volt due to slight resistance in the line. So if I read 14.1v at the alt or battery the amp will read about 14.04 or spmething. But it's when it's playing that the voltage can drop drastically at the amp. Maybe I'll try to get a video of it.



    Vehicle: 2007 Pontiac G6 GT
    Head Unit: Kenwood DDX419
    Speakers: Focal PS165 Components
    Distribution: Knukonceptz KNF-60 Power/Ground Distribution block
    Amps: Audioque 200.2, Rockford Fosgate T2500-1BDCP
    Subs: 2 SA-8v2 D2 wired @2ohms in custom ported box tuned to 34-35hz
    Wiring: All 1/0 Gauge SHOK Wire and Knukonceptz wire + BIG 3
    Alternator: Singer 310A 6 Phase High Output Alternator

  6. #35
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    Re: Massive voltage drop at amp but not at battery? Help

    might be the distro then.

    Matt



    Star Mountain Nuthugger #5
    12" TC9 in 1.39 cubes @30hz
    Boston Acoustics GT-2300 @4 ohms bridged.

    Quote Originally Posted by double 07 View Post
    Sub cutout got a little skar on it...dad blamed round over bit bearing came flying off.......LOL.......
    Quote Originally Posted by gckless View Post
    A little Skar on it? Was it a B-stock bit?
    Refs:
    bought from Nitefury360, Tallic, SPLaudio X2
    Traded with Marleyskater420

  7. #36
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by mat3833 View Post
    i use 12 ga for the test. doesnt matter what kind of wire you use, just make sure to measure the resistance of it before you do the test.



    NO. obvioisly you havent read a **** thing, his voltage is dropping ONLY at the amps. not the battery. this means something isnt right, either a bad connection or ground or something. im trying to walk him through a few ways to find out if his grounds are solid as well as eliminating the distro as a problem.

    Matt
    I guess, I'm missing something. So what amp, how big is the alternator and how many extra batteries?




  8. #37
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by mat3833 View Post
    might be the distro then.

    Matt
    Ok here's the video. It's not quite a 2v difference but it's still quite a large variation and the voltage is holding much stronger at the battery.


    https://db.tt/rG1QAJP0



    Vehicle: 2007 Pontiac G6 GT
    Head Unit: Kenwood DDX419
    Speakers: Focal PS165 Components
    Distribution: Knukonceptz KNF-60 Power/Ground Distribution block
    Amps: Audioque 200.2, Rockford Fosgate T2500-1BDCP
    Subs: 2 SA-8v2 D2 wired @2ohms in custom ported box tuned to 34-35hz
    Wiring: All 1/0 Gauge SHOK Wire and Knukonceptz wire + BIG 3
    Alternator: Singer 310A 6 Phase High Output Alternator

  9. #38
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by hispls View Post
    I guess, I'm missing something. So what amp, how big is the alternator and how many extra batteries?
    never bothered to ask because the voltage at the battery stays where it should. ive never seen the battery stay at 13.6 and the amp drop to sub-11V sue to too much current draw. ive seen battery AND amp voltage drop due to that tho. and the info is in his sig. big 3 in 0ga. 0ga run to the back. RF 2500.1 BDCP and an AQ 200.2 no extra batts are listed. and hes at 2 ohms, so current draw shouldnt be that high unless hes clipping the **** out of the signal. but even then battery voltage would drop too.

    Matt



    Star Mountain Nuthugger #5
    12" TC9 in 1.39 cubes @30hz
    Boston Acoustics GT-2300 @4 ohms bridged.

    Quote Originally Posted by double 07 View Post
    Sub cutout got a little skar on it...dad blamed round over bit bearing came flying off.......LOL.......
    Quote Originally Posted by gckless View Post
    A little Skar on it? Was it a B-stock bit?
    Refs:
    bought from Nitefury360, Tallic, SPLaudio X2
    Traded with Marleyskater420

  10. #39
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    Re: Massive voltage drop at amp but not at battery? Help

    Also I will mention that the amp is only tuned to put amount approx. 1000w to the subs. NOT the full 3600w this amp is capable of. I'm not an idiot lol. If I ran 3600w to those 8s I would blow them right out of the basket in their current box. Not to mention completely fry my electrical system in about 30 seconds haha



    Vehicle: 2007 Pontiac G6 GT
    Head Unit: Kenwood DDX419
    Speakers: Focal PS165 Components
    Distribution: Knukonceptz KNF-60 Power/Ground Distribution block
    Amps: Audioque 200.2, Rockford Fosgate T2500-1BDCP
    Subs: 2 SA-8v2 D2 wired @2ohms in custom ported box tuned to 34-35hz
    Wiring: All 1/0 Gauge SHOK Wire and Knukonceptz wire + BIG 3
    Alternator: Singer 310A 6 Phase High Output Alternator

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    Re: Massive voltage drop at amp but not at battery? Help

    OK, I guess it must be something other than trying to run 3K amp on stock electrical. Keep changing grounds and distro blocks and adding more 1/0 gauge, I'm sure that'll sort you right out. I'm done here.




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    Re: Massive voltage drop at amp but not at battery? Help

    can you not read? he is running 1K on stock electrical his car has a 120+ amp alt. having voltage issues ONLY at the amp and not at the battery/alt means something is wrong from the battery to the amp or the amp to the ground. hell it could be something entirely diferent. but running 1K on a 120A alt with the big three and 0ga is NOT an issue man. are you smoking crack? if he was running at 1 ohm yea, sure its the amp drawing too much current. but running at 2 ohms he should have no issues at all.

    Matt



    Star Mountain Nuthugger #5
    12" TC9 in 1.39 cubes @30hz
    Boston Acoustics GT-2300 @4 ohms bridged.

    Quote Originally Posted by double 07 View Post
    Sub cutout got a little skar on it...dad blamed round over bit bearing came flying off.......LOL.......
    Quote Originally Posted by gckless View Post
    A little Skar on it? Was it a B-stock bit?
    Refs:
    bought from Nitefury360, Tallic, SPLaudio X2
    Traded with Marleyskater420

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    Re: Massive voltage drop at amp but not at battery? Help

    Have you metered the same voltage drop on both sides of the distro?
    i.e. in / out?




  14. #43
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by azmcrae View Post
    Have you metered the same voltage drop on both sides of the distro?
    i.e. in / out?
    didnt think of that. good idea. if its not the distro and all the connections at the amp are secure idk what it could be.

    Matt



    Star Mountain Nuthugger #5
    12" TC9 in 1.39 cubes @30hz
    Boston Acoustics GT-2300 @4 ohms bridged.

    Quote Originally Posted by double 07 View Post
    Sub cutout got a little skar on it...dad blamed round over bit bearing came flying off.......LOL.......
    Quote Originally Posted by gckless View Post
    A little Skar on it? Was it a B-stock bit?
    Refs:
    bought from Nitefury360, Tallic, SPLaudio X2
    Traded with Marleyskater420

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    Re: Massive voltage drop at amp but not at battery? Help

    Also, do you have a fuse or circuit breaker up front near the battery?
    Check both sides of it if you do.

    I have seen this same problem several times back when I had my car audio shop.




  16. #45
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by azmcrae View Post
    Also, do you have a fuse or circuit breaker up front near the battery?
    Check both sides of it if you do.

    I have seen this same problem several times back when I had my car audio shop.
    I have a 250A ANL Fuse up front within about 8 inches of the battery.



    Vehicle: 2007 Pontiac G6 GT
    Head Unit: Kenwood DDX419
    Speakers: Focal PS165 Components
    Distribution: Knukonceptz KNF-60 Power/Ground Distribution block
    Amps: Audioque 200.2, Rockford Fosgate T2500-1BDCP
    Subs: 2 SA-8v2 D2 wired @2ohms in custom ported box tuned to 34-35hz
    Wiring: All 1/0 Gauge SHOK Wire and Knukonceptz wire + BIG 3
    Alternator: Singer 310A 6 Phase High Output Alternator

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