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    question on upgrading alt and fuse ?

    I have a JBL 1200.1 amp and the alt is 105amps, the lights dim pretty bad and i havent even turned the amp up at all yet. it pounds my 15" rockford good. I blew my 60A fuse so i put a 80A fuse in, will that hold good? My other queston is will upgrading my alt to 140 be enough amps or do i need to go higher? any feedback? thanks!







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    Trixter's Avatar
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    140-160 amp alt. should do. I am getting a 180 and my system is 1800w rms total (1400 for sub and 400 for highs.)



    2006 Jeep Liberty
    Adire Audio 15" Brahma running off Cadence A7hc, Clarion hu, MB Quart 6.5s and 5.25s running off old school Punch 800a4

    146+db @ 38hz with 1200w and a single 15"

    Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
    *Vb = vol. in cu"
    **R = sq.rt. A / Pi (for square/slot port)

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    Re: question on upgrading alt and fuse ?

    Originally posted by ryguy1607
    I have a JBL 1200.1 amp and the alt is 105amps, the lights dim pretty bad and i havent even turned the amp up at all yet. it pounds my 15" rockford good. I blew my 60A fuse so i put a 80A fuse in, will that hold good? My other queston is will upgrading my alt to 140 be enough amps or do i need to go higher? any feedback? thanks!
    What ohm load do you have your amp running at? The reason I ask is because I have the same amp running @ 1 ohm on a hcca 15 with only a 50 amp fuse and I've never had a problem with it




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    Re: Re: question on upgrading alt and fuse ?

    Originally posted by RMKrider1
    What ohm load do you have your amp running at? The reason I ask is because I have the same amp running @ 1 ohm on a hcca 15 with only a 50 amp fuse and I've never had a problem with it
    and it is f-in loud...if you have a 105 amp alt and your lights are dimming then your amp is drawing some power....

    D




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    ryguy1607's Avatar
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    im not sure what ohm load but i have the he2 and each voicecoil is running into a channel on the amp.




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    It's actually a mono amp. I know nothing about the he2's or rockford for that matter but my guess is that it's dual 4 ohm right? If so your amp is running at 2 ohms




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    Trixter's Avatar
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    Yes. The HE2 is a dual 4ohm coil sub. Your amp will be seeing a 2ohm load. What is the amp rated for at 2ohm? What size box?



    2006 Jeep Liberty
    Adire Audio 15" Brahma running off Cadence A7hc, Clarion hu, MB Quart 6.5s and 5.25s running off old school Punch 800a4

    146+db @ 38hz with 1200w and a single 15"

    Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
    *Vb = vol. in cu"
    **R = sq.rt. A / Pi (for square/slot port)

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