Inline Fuse Keeps Blowing, Amp problem or install problem?

[highhpsupra 10+ year member]

I installed my US Amps IS2200 today and ran into a problem. I am using 8awg wire temporarily and used only one channel on the amp at 4ohms.

The amps rated output at 4ohms on one channel is 200RMS, so 8awg should be good enough.

The fuse on the amp are 3x30 so 90 in total.

However, the fuse at the battery is 50amps. (AGU fuseholder)

Everytime i start the ignition the fuse blows instantly. Even with the amp on the lowest gain setting.

Any idea on what can be causing this?

When i did a search it said a short in the power wire can cause this, so im not going to rule that out. I also read that you can test for a short in the wire by disconnecting the powerwire from the amp and taping the end off and putting a new fuse in to see if it blows.

If it blows then its a short in the power wire, if not its a faulty amp. Correct??

Any other things that i should look at before diagnosing this amp as a desfective one?

Thanks for the help.

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[xluben 10+ year member]

yeah, try unhookin the power, tape it up, and then start the car.

if the fust doesn't blow, it was probably a short before.

try hooking it back up carefully and hopefully it'll work.

even one strand of wire going from power to ground could cause problems.

 

[KaeZoo 10+ year member]

A shorted power wire isn't affected by the key switch. If your power wire was shorted, the fuse would blow as soon as you put it in. It sounds like your amplifier has a problem.

 

[highhpsupra 10+ year member]

hmm, im going to run another power wire outside the car to test it out and be sure there isnt a short anywhere in the powerline. i guess if it still blows then its a faulty amp?

thx for the help.