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So in the 4Runner I had installed a old Punch 600a4, and it was running a single 10.
I ended up blowing the 10 awhile back, and just now I finally got a new one to put in.

I hook it up, no sound.

so I unbolt the seat and look at the amp. It's powering up, so I get my little stereo and hooked it up to the RCA ins. STill nothing, I then got a spare speaker, nothing.

I took the amp out and looked inside. Don't see anything burnt and no burnt smell.

These amps had protection circuits right, the blown speaker shouldn't have hurt it right?

Do you guys think the amp is fried?

Grrr, I was hoping to just put this sub in and be good to go.

Chris

None of the channels are working?

nope, nothing out of any of them.

I'm stumped on this one.
I would think if the outputs were bad, it wouldn't even power up. The LED comes on, but no sound at all.

Maybe a really bad ground? Is it going into protection mode?

MobileAudio219 wrote:Maybe a really bad ground? Is it going into protection mode?

I don't think it's going into protection mode, there is only 1 LED and it's solid like it always has been.

I took it out of the truck and hooked it up on the bench and it's doing the same thing. So odd.

make sure your remote source is a full 12v ive had that happen once where the remote was like 8v and it was enough to turn on the amp LED but wouldnt run anything else.

I ended up just buying another amp off of craigslist, hooked it up and everything is working now.

Not sure what happened to the other amp, but that was the second Fosgate amp I've owned that just mysteriously stopped working.
Same thing on both, the LED would light up but no output.

One was a 500a2 and this one was a 600a4.
From the same period, not sure if there is something up with those amps or what.

What kind of amp did you end up getting?

MobileAudio219 wrote:What kind of amp did you end up getting?

I got a little MTX amp, for $60.
It had about the same output as the Fosgate.