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    gamehawk55's Avatar
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    Massive voltage drop at amp but not at battery? Help

    Hey guys,

    For the longest time I've been battling voltage issues and every time I think it's fixed it eventually comes back a few days later. My problem is that my voltage at my amps is dropping HARD (13.9v down to 11.8). But yet reading the voltage at the battery barely shows even a 0.2v drop. WTF!!.

    Everytime I mess with something, whether it be changing up the ground or adding a bigger fuse or adding extra buss bars to my distribution block the voltage holds ALOT stronger at the amps and seems to be about right. Then as the days go on the voltage drop at the amp becomes worse and worse again but STILL the voltage drop up front at the battery is next to NOTHING!!. This doesn't make any logical sense at all. I need to get this sorted because it's driving me nuts and it's probably going to end up killing my equipment.



    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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    mat3833's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    this is probobly a stupid question. but are your distros/fuse holders using ring terminals or set-screws? i had a problem WAY back similar to this and it ended up being the power wire ring terminal at the fuse. the ring terminal was crimped, but the wire was slightly loose inside it. voltage would be fine for a bit but start dropping as the wire heated up from "arcing" to the ring terminal.

    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
    this is probobly a stupid question. but are your distros/fuse holders using ring terminals or set-screws? i had a problem WAY back similar to this and it ended up being the power wire ring terminal at the fuse. the ring terminal was crimped, but the wire was slightly loose inside it. voltage would be fine for a bit but start dropping as the wire heated up from "arcing" to the ring terminal.

    Matt
    Fuse holder up front is set screws and the KNF-60 Distro block doesn't use either. It uses special compression fittings and mini-ANL fuses and buss bars to make it's connections.

    This is the distro I'm using. Knukonceptz product detail for KONFUSED 2 WAY POWER AND GROUND DISTRIBUTION BLOCK



    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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    mat3833's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    try removing the distro and running the fosgate by itself. not saying that distro is junk, but i dont trust fittings like that. crimp and solder or set screw for me.

    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

    take batts out and test indevidually




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

    Quote Originally Posted by Side Show View Post
    take batts out and test indevidually
    I'm not running multiple batteries right now. No point in doing so when I'm only running 1000-1200W 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

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

    with that amount of volt drop.... I think you may need a better or second battery, and I think 0 gauge is too big (if that's possible)




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

    Quote Originally Posted by mat3833 View Post
    try removing the distro and running the fosgate by itself. not saying that distro is junk, but i dont trust fittings like that. crimp and solder or set screw for me.

    Matt
    That's gonna be the next plan. Will probably try that tomorrow after work. If it turns out it is the distro causing me all my headaches what is going to be the best re-coarse of action to get both amps hooked back up reliably?



    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

    Quote Originally Posted by Side Show View Post
    with that amount of volt drop.... I think you may need a better or second battery
    Did you not read the OP properly?. The AMPS are showing voltage drop when there isn't any. Meaning it isn't a battery problem. The voltage is only dropping 0.2-0.4v at the alternator/battery, while the voltage is dropping 1.0-2.0v at the amp.

    I can literally watch my RF amps battery level dip into the redline (<11-12v) and my battery up front will only drop to 13.6v from 13.8v. That means the power isn't being transferred to the amp properly otherwise I should see the EXACT same voltages at the battery AND the amp. Maybe a slight variation in the 2 to account for resistance in the line. But a 2v difference? Highly doubt it. And before you say the LED indicator on the RF amp isn't accurate. It is. I can check it with a DMM and get the same read-out.



    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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    Side Show's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    what battery are you talking about? whats the CCA rating for it? so when you have it all wired up and playing, your battery only goes down to 13.6 volts at your battery terminals? but at your amp input your getting 11.0v?




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    mat3833's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by gamehawk55 View Post
    That's gonna be the next plan. Will probably try that tomorrow after work. If it turns out it is the distro causing me all my headaches what is going to be the best re-coarse of action to get both amps hooked back up reliably?
    just pick up a distro that uses set-screws or ring terminals. set-screws are eaiser. and while you are in there make sure you have a SOLID ground. hell, if you have the wire, make a run from the amp outside the car to the battery for this test. 90% of voltage issues are from bad grounds.

    Matt

    Matt

    ---------- Post added at 03:31 AM ---------- Previous post was at 03:30 AM ----------

    Quote Originally Posted by Side Show View Post
    what battery are you talking about? whats the CCA rating for it? so when you have it all wired up and playing, your battery only goes down to 13.6 volts at your battery terminals? but at your amp input your getting 11.0v?
    yes, his battery voltage is staying at 13.6 but in the trunk at the amp voltage is 11 or lower.

    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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    Side Show's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    4 gauge would be better for that amount of pwr wouldn't it?




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

    Quote Originally Posted by Side Show View Post
    4 gauge would be better for that amount of pwr wouldn't it?
    It's already all 0 gauge. Did you think I was running 8 gauge to that monster amp or something? I'm not a moron.



    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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    mat3833's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    Quote Originally Posted by Side Show View Post
    4 gauge would be better for that amount of pwr wouldn't it?
    no. just NO. smaller wire is NEVER better. the bigger you can go the better. bigger wire has less resistance. less resistance means less heat and less voltage drop. obviously you dont need to run 4ga to your mids and tweets, but when it comes to feeding amps BIGGER, always. for subs i try to use 8ga whenever possible.

    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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    Side Show's Avatar
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    Re: Massive voltage drop at amp but not at battery? Help

    like I said wouldn't 4 gauge be better than 0 gauge for that amount of pwr (1200wrms) thort the thicker and longer the cable the more volt drop you would see...... hope it's just the distro block thoe




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