Amp wiring, battery draining
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=84481
Printed Date: September 14, 2025 at 6:23 PM
Topic: Amp wiring, battery draining
Posted By: rangerrick5
Subject: Amp wiring, battery draining
Date Posted: October 22, 2006 at 9:22 PM
I have a + cable running directly to the battery from the AMP and I believed I hooked it up so that when the car was off the power was off, however...if I don't start my car everyday the battery goes dead. I have since unhooked the cable from my battery and the battery no longer goes dead. I was thinking about putting in a toggle switch to cut off power but really that is so busch league... Is there a relay design I can use to cut the power once the car is off or some other way? Thanks John
Replies:
Posted By: i am an idiot
Date Posted: October 22, 2006 at 9:34 PM
Your amp should have a power, ground and a remote wire on it. The power wire should be ran to your battery just as you did it. The only problem there is you probably did not put a fuse in the wire near the battery. You really need to put a fuse holder as near the battery as you can, failure to do this could result in a fire. Now getting to your problem the remote wire is the wire that controls when your amp turns on and back off. This wire needs to be connected to your radio's amp turn on wire, If you are using the factory radio you will need to hook the remote wire to the switched power wire of your radio. We need to know what kind of vehicle you are working with to give you any more info.
Posted By: rangerrick5
Date Posted: October 22, 2006 at 9:48 PM
I have a Kenwood KDC-X789 Head Unit and it's in a 97 Pontiac Grand AM.
Posted By: fetman
Date Posted: October 22, 2006 at 10:17 PM
hi i was wondering if you could give me the same information for my car i have a 2005 jeep liberty with a stock cd player thanks
brian
------------- bfet
Posted By: i am an idiot
Date Posted: October 22, 2006 at 10:37 PM
Rick you should have a blue or a blue wire with a white stripe on the back of your Radio. If you have both use the blue/white This wire needs to be connected to the terminal on your amp labeled Remote, or turn on or AP it is usually a smaller terminal between or next to power and ground. Do you have a fuse near your battery? Brian you will have to get help from some of the others here it has been many years since I have installed. Your radio may not have an accessory wire to hook to. I will try to get you some info at work Monday.
Posted By: haemphyst
Date Posted: October 22, 2006 at 10:51 PM
Whether there is a fuse or not, that will not cause the battery to go dead. If there is NOT a fuse, you are looking at the possibility of burning your car to the ground.
There is another issue, somewhere. Remove whatever you have attached to the remote terminal of the amplifier, and see if the battery goes dead, even with the power cable left connected. When you remove it, does the power light on the amp go out? Does the power light actually function? (i.e. does it turn on and off, indicating the state of the amplifier?)
Tell us ALL of the other troubleshooting you may have perfomed, OTHER than just removing the postive terminal from the battery.
------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: rangerrick5
Date Posted: October 22, 2006 at 11:01 PM
I have looked and when the car is not running the amp light goes out. But what I did was unhook the neg cable from the battery and put a test light between the neg terminal on the battery and neg cable. The light stayed on strong. I unhooked the amp from the battery and the light went out and the battery has remained charged with no problems for 3 days now. That has been the extend of my trouble shooting as I felt that once I unhooked the amp and the light went out the problem was partially solved. Yes I do have a fuse located near the battery inline with the amp. I purchased an amp wiring kit and the wire came with the inline fuse :-) No fires please....
Posted By: jeffchilcott
Date Posted: October 23, 2006 at 8:30 AM
what type of amp? was it purchased new or used? sounds maybe like a faulty product.....
we had similar issues with an amp before and replaced the amp and everything went away.
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Posted By: rangerrick5
Date Posted: October 23, 2006 at 6:46 PM
I have to check the remote wire and make sure it's hooked to the remote from the head unit. It's a weekend project [this weekend]. If it's not hooked up correctly I will surely post the amp type for further input! But I Thank you all!!!! Keep yer fingers crossed.
Posted By: master5
Date Posted: October 23, 2006 at 7:02 PM
All you need to do is turn off the car, then see if there is still power on the remote wire at the amp. Use a meter, you can not gat an accurate reading by eye or with a "light" If there is, you found the problem If not, could be a faulty amp, seen this before but it's rare. I would also consider a simple current draw test using a DMM if all else fails. But since you state the dead battery problem goes away if you dissconnect the amp, you basically have proven the problem lies in that area. don't always go by the light on the amp. On most amps the light will still come on as long as the remote has 12v on it. The power wire does not even have to be connected. The only reliable way to test anything is with a meter. Keep us posted. -------------
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