Amp not getting the signal from the HU

[Hartman]

A friend an I just did an install in his Cutlass but we've encountered a problem that has baffled us. The system consists of 3 12" 2ohm Kicker CVRs, a Hifonics Brutus 1500(mono), and a Rockford cap. The amp is getting power fine and the digital readout on the cap is working, but the subs are getting no signal at all. We triple checked the RCAs and everything is fine. We switched between the two channels but still nothing. We went over all the sub wiring and it is perfect. It seems that even if the subs were wired wrong that something would come out of the speakers, even if it sounded bad and the amp would go into protection.

What is wrong here?

 

[03ExplorerSPT]

Maybe something in the amp is broken? That does sound really strange that it doesn't play. Even if the polarity is wrong on the speakers you should at least get a horrible sound out of them. Maybe the RCAs on the HU are broken and aren't sending a signal to the amp.

 

[Hartman]

We can't think of anything else but an internal amp problem. The RCAs on his HU worked fine with his old system, so I'm sure that's not the problem. The only other long shot is that the RCAs got severed somehow when we were running them. Highly unlikely, but we will check it tomorrow.

 

[Alec]

Check all the wires with a multimeter 1) to see if you're getting any voltage readings (signal) from the RCAs or at the amp out, etc and 2) if there's no signal then check for continuity in the wires (resistance).

If the wires check out and there is signal in and no signal out, then it's obviously the amp.

 

[kalel33]

If that doesnt work then,for final check up, check to see if the sub wires are hooked up to the terminal inside of the sub box.

 

[Hartman]

We already checked all the sub wiring and it is fine.

 

[98XOwner]

The same thing happened to me, it turned out that it was an internal problem in the amp, got a new one and it worked like a charm.

 

[KPT]

You could get a portable cd player and a y cable to rule out the headunit and RCA's from it to the amp. Plug it directly into the amp and temporarily wire the remote lead on the amp to constant obviously.