two amp problem
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=118485
Printed Date: May 12, 2025 at 9:09 AM
Topic: two amp problem
Posted By: gull06
Subject: two amp problem
Date Posted: December 13, 2009 at 1:34 PM
I recently installed another amp to my existing setup. I have a '08 Chrysler 300 and 2 12" Kicker L7 subwoofers powered by a ZX1500.1 (08 model) and just installed a ZX750.1 (older model) to power the other sub. After I installed the ZX750.1 my ZX1500.1 won't turn on, all the cables are wired properly, I tested all the volt and ohm readings with a volt meter and everything is good. I even disconnected the ZX750.1 and only connected the ZX1500.1 and it still wouldn't turn on. Why won't it turn on?
Replies:
Posted By: i am an idiot
Date Posted: December 13, 2009 at 1:57 PM
When you checked voltage, did you have the black meter lead on the ground terminal of the amp, or did you have it to the chassis of the car? Did you check for voltage on the remote wire also? I am betting that you checked with the meter lead on the chassis of the car, and you have a bad ground.
Posted By: gull06
Date Posted: December 13, 2009 at 2:00 PM
Yes, I checked with the black meter to the ground and to the car and both readings were the same, and I checked the remote wire voltage as well.
Posted By: i am an idiot
Date Posted: December 13, 2009 at 2:08 PM
If the amp has no fises mounted to the end of it, it sounds as though you may have a broken amplifier. If it has fuses, check them.
Posted By: gull06
Date Posted: December 13, 2009 at 2:10 PM
No fuses, so I guess I blew my amp then, wish I knew how because I only had it for a week.
Posted By: i am an idiot
Date Posted: December 13, 2009 at 2:35 PM
Does the power light work at all? Is the protection light on? Was there ever any smoke coming from the amp?
Posted By: gull06
Date Posted: December 13, 2009 at 3:31 PM
Power light doesn't work, protection light would blink when I used the voltmeter between the power connector and remote connector on the amp, no smoke and it doesn't smell unusual either.
Posted By: i am an idiot
Date Posted: December 13, 2009 at 3:42 PM
What kind of voltage reading did you get on the power and the remote wires? I see no reason for the light to flash when testing it with the meter.
Posted By: gull06
Date Posted: December 13, 2009 at 3:46 PM
I can't remember exactly what it was off the top of my head, and I don't have the voltmeter here, but it was very low when it was off and was over 12v when it was on.
Posted By: i am an idiot
Date Posted: December 13, 2009 at 3:55 PM
The power wire was low when the radio was off? Are you sure that it was not low when the radio was on, and above 12 when the radio was off?
Posted By: gull06
Date Posted: December 13, 2009 at 4:09 PM
I honestly can't remember, it was really late last night when we were working on it and I was frustrated and just wanted to get home and sleep haha.
Posted By: i am an idiot
Date Posted: December 13, 2009 at 4:21 PM
If there is a bad connection on the power wire, it would show above 12 volts when the amp is not on. When you turn the system on, the current draw through the bad connection will lower the voltage. Since you had one reading that was low, this would have to be the case. If you find that to be the case, leave the amp on and carry the volt meter to the battery. Black lead on the negative terminal of the battery, red lead on the input side of the fuse going to that amp. If it is 12 or greater there, move the red meter lead to the other side of the fuse, what is that reading?
Posted By: gull06
Date Posted: December 13, 2009 at 4:24 PM
I don't have a voltmeter right now but I'll check this tomorrow and let you know what I find.
Posted By: i am an idiot
Date Posted: December 13, 2009 at 4:31 PM
Is there an AGU type fuse in the power path of that amp? If so, replace the fuse, even if it does not look blown.
Posted By: gull06
Date Posted: December 13, 2009 at 4:49 PM
Ok, I'll try that too.
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