Amp going to protect even at low volume

[Matt_z34]

So I got a new car and put my old setup in (skar lp1000 monoblock, Jensen w12 4 ohm single coil, 4 gauge), whenever I turn up the volume slightly my amp goes to protect. Multimeter says battery isn't dropping voltage but when I check at the amp I can drop from 12 to 9.5 on a small bump, ground and all wiring is fine. Battery not discharging fast enough maybe? Would adding a second small battery help with this? Really can't figure this one out.

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[Popwarhomie 5,000+ posts]

If you are dropping to 9.5 volts on a 1k wired to 4 ohms you have a major issue.

Bad ground
Bad battery
Bad wiring

 

[Matt_z34]

If you are dropping to 9.5 volts on a 1k wired to 4 ohms you have a major issue.

Bad ground
Bad battery
Bad wiring

Is there anyway I could narrow it down? I know my ground is good I checked resistance and there was basically non from the factory ground. The car was wired previously before I bought it and they left the wiring in, but I checked it all before I even put the amp in and it all worked fine. If i buy a new battery to test could u return it if that's not the problem?

 

[Popwarhomie 5,000+ posts]

Check your fuse and fuse holder. I remember years ago I had a similar issue and the fuse holder had melted but not popped the fuse. My voltage at the amp was 9.8 and 14.6 at my battery.

 

[Matt_z34]

Check your fuse and fuse holder. I remember years ago I had a similar issue and the fuse holder had melted but not popped the fuse. My voltage at the amp was 9.8 and 14.6 at my battery.

I tested the system with no fuse and got the same result.

 

[audiobaun 5,000+ posts]

What vehicle?

 

[audiobaun 5,000+ posts]

Bench test the amps and see if there are any issues

 

[Matt_z34]

Bench test the amps and see if there are any issues

Do I need to send it somewhere for that? Im not even sure how I would get that done.

 

[audiobaun 5,000+ posts]

Do I need to send it somewhere for that? Im not even sure how I would get that done.

You can take it to a local Car audio shop and they can bench test it there.Some charge very little/$20-30 bucks.Some computer repair shops will test them as well.

 

[audiobaun 5,000+ posts]

If that amp isnt under warranty, you can crack it open to view the board to see if there is a loose connection on the power supply that may just need to be soldered back in place. Look to see if any Mosfets are burnt/not connected to the board or swollen caps/burnt caps ect.