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Stereo amp power supply

I have a 93 jeep and i was wondering if i could run my stereo amp off the power supply for the modem that goes to the car phone instead of going through the firewall to the battery.

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  • jerry9364 Mar 11, 2009

    Modem is no longer connected. So it would not be sharing the power. it's a small amp, 150 watts. Hoping to avoid drilling through my firewall, but if i have no other option where is the best place to go through at.

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No I wouldn't share the amp feed. It should be stand alone, with its own fuse.

Yes it is wise to connect directly to the battery, hence through the firewall.

You should purchase an amp wiring kit, matched to the
watts of the amp. It has everything you need to correctly make all of the connections.

Good luck
Aduz

Posted on Mar 11, 2009

  • Arthur Bayne Mar 15, 2009

    I mostly make the penetration on the battery side of the firewall, You may find an existing rubber grommet that will accommodate the wire, or at last resort you'll need to drill a hole.
    Note: before I attempt any drilling I always inspect both sides of the firewall for obstructions and other components that may be accidentally drilled (HVAC duct work, wiring harnesses, exhaust heat shields etc...) I also use a grommet to prevent the sharp metal from cutting the insulation of the wire and causing a short circuit.

    The reason I always power an amp directly from the battery is because, it is a shorter distance that the power has to travel as opposed to the under dash wiring that laces throughout the dash, and it assures me that the complete circuit is of the correct wire gauge. (an amp properly powered will produce better sound quality)

    Another tip, always run the power wires in a separate chase (location) then the signal (speaker) wires, as to avoid the signal wires picking up the resistance given off from the power wires that causes buzzing noise in the speakers.

    Aduz



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======================================================================
STEP 1: Find a spot to run the power wire from your battery - through your firewall and into your car - and then to your amp. (DO NOT CONNECT IT TO ANYTHING YET)
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*you will need to know which wires run to the speakers you plan to power with the amplifier
B3 - once the converter is properly connected - proceed to step 3
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STEP 5: re-install your stereo into the car.
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STEP 8: Connect the speaker wire from the OUTPUTS on your amp to the speakers you wish to power
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STEP 11: Connect the POWER CABLE to the battery cable
STEP 12: Re-connect your Battery
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