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-   -   No power to amp? But capacitor does have power (http://www.jeepforum.com/forum/f20/no-power-amp-but-capacitor-does-have-power-1535274/)

PurpleTJ 06-11-2013 05:24 PM

No power to amp? But capacitor does have power
 
My sound system quit working on me right before I left the country last year. Now I'm back and trying to fix it.

I have power coming from the battery and through a capacitor, then to the amp. The amp gets no power, but the capacitor does. Cap's ground is good, as is the amp's. No fuses are blown. Is my amp fried? Is there a way to check if it is?

rubibluejay 06-12-2013 08:36 PM

Place a temporary jumper wire from the amp's power wire to the amp's remote + trigger. If the amp turns on, you most likely have an issue with your head unit's remote (amp trigger) wire.

Post back up with the results.


:cheers2:

Jay

PurpleTJ 06-13-2013 01:02 PM

Can I use any old wire for the jumper? or should it be a certain gauge?

rubibluejay 06-13-2013 01:43 PM

A piece of speaker wire will do.


Jay

Indy 06-13-2013 03:07 PM

Pretty much anything will work. The amps flowing through that wire are really really low. Its just enough that the amp knows the deck is on and it should do likewise.

PurpleTJ 06-14-2013 09:58 AM

Thanks. I'll give it another look when I get home today and come back with the results.

kingcat400 06-15-2013 02:45 PM

Also try jumping the cap. For the most part caps are useless anyway. Mostly used to mask a problem.

PurpleTJ 06-16-2013 03:52 PM

Quote:

Originally Posted by kingcat400 (Post 15565322)
Also try jumping the cap. For the most part caps are useless anyway. Mostly used to mask a problem.

I installed my cap to get rid of the speaker whine.

Still no results. Jumped between the power and remote wire, and also jumped the cap.

Indy 06-17-2013 10:03 AM

Capaciter wont fix whine, thats your grounds. Have a multimeter? If you have 12v at the amp, 12v on the remote wire, 0phms on your ground, verified by meter fuses and the amp wont power up, your amp is dead. If you dont have a meter, go buy one. Theyre cheap and you should have one anyway.

PurpleTJ 06-17-2013 01:20 PM

Quote:

Originally Posted by Indy (Post 15571835)
Capaciter wont fix whine, thats your grounds
.

The capacitor fixed my whine.

Quote:

Originally Posted by Indy (Post 15571835)
Have a multimeter? If you have 12v at the amp, 12v on the remote wire, 0phms on your ground, verified by meter fuses and the amp wont power up, your amp is dead. If you dont have a meter, go buy one. Theyre cheap and you should have one anyway.

No, but I'll buy one and try this. I was kind of avoiding doing this to avoid the truth that my amp is actually dead :(

PurpleTJ 07-04-2013 12:56 PM

Okay, so possibly some good news? I have 12v at the amp power, but the remote wire barely wiggles the needle. Yet, the amp didn't turn on when I jumped the wire. Could this still mean its a problem with my head unit?

PurpleTJ 07-04-2013 01:46 PM

Scratch that. I pulled the dash apart, and the wires came apart where I spliced the remote into the head unit. I reconnected the wires, and now have 12v on the remote wire at the amp. Amp is still not turning on. Soooo dead amp?

thantos858 07-05-2013 05:28 PM

Quote:

Originally Posted by PurpleTJ (Post 15640974)
Scratch that. I pulled the dash apart, and the wires came apart where I spliced the remote into the head unit. I reconnected the wires, and now have 12v on the remote wire at the amp. Amp is still not turning on. Soooo dead amp?

Check all the fuses and grounds first. A loose ground or blown fuse on the amp itself can cause the amp not to work. Also make sure the wires to the speakers are connected and that your settings on the head and amp are correct. Amazing how many times I have had a buddy tell me a amp is dead when its a simple setting.

PurpleTJ 07-05-2013 06:32 PM

Quote:

Originally Posted by thantos858 (Post 15644668)
Check all the fuses and grounds first. A loose ground or blown fuse on the amp itself can cause the amp not to work. Also make sure the wires to the speakers are connected and that your settings on the head and amp are correct. Amazing how many times I have had a buddy tell me a amp is dead when its a simple setting.

All fuses are good, all grounds are good. I've checked and re checked them all. I wish it were just settings in my head unit. It was working for months, then all of a sudden stopped. I never changed any settings.

Indy 07-05-2013 10:35 PM

If at the amp you have power, grounf and power on the remote and good fuses in the amp but nothing past, your amp is dead.


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