Well I tried grounding the amp through a block to the battery and it made no difference what so ever. But I think it might be the crossovers for my components causing the noise. So I have a few more things to try and if none of them work I will have to do what I always hated doing. Paying someone to look at it.

 

good luck, where do ya live, maybe one of us is close enough to help

 

I had a friend that had a similar prob. We had to ground EVERYTHING to the some point. What finally did it was to run a wire from the radio chassis to the rear where the amps are. How about a complete run down of what is installed. There are "ground loop isolators" that are avail at the local car parts store or maybe even Walmart or kmart type place. You should NOT be able to find them at a stereo install shop. In the realm of stereo world they are considered a short cut. What you might do is get one and stick it on the radio power lead. This should quieten or eliminate the noise, you can atleast verify that it is a grounding issue. Ask around some stereo guys and see if they have any laying around. I used to have practically a complete system in boxes to test out customers or friends vehicles.

These are some of the "rules" that I follow when installing:
NOISE
1) power and ground straight from the battery.
2) ground everything to one point.
3) when running cables to the rear, power on one side and RCA on the other.
4) if cable do have to cross, do it perpurdicular(sp)
POWER
5) use correct guage for draw
6) fuse the main power lead < 1 foot from the battery
SYSTEM SURVIVAL
7) NEVER run the input gain at max
8) dont go above 3/4 max vol
9) X-over or Bassblock anything but subs


Here is a website that I found on "alternator noise". CarStereo.com.
Lots of good info there.

 

I Live In Las Vegas. So If anybody Lives in town and wants to help let me know.

 

I really appreciate everybody's help. I have been working on car stereos for a couple of years now and I never have had as many problems as I am having now. I know the rule about running the power wire down one side and the RCA's down the other. Every car i have ever had I have done that. Now the magnum has the battery in the back so i don't even have to run the power wire through the car. It's just run straight to the fuse block. the RCA's don't even come near it. Everything is grounded to the battery also. My guess is that it's the crossovers picking up the noise but it's 110 degrees outside and I really don't want to work on the car. When It cools down some I will work on it some more because I want to fix the problems and then when this is all set I am going to put my subs in.

 

Been a while since you posted opposite. Any updates?

Me? I've given up.

As long as I only use a amp for the woofer, where I can cut out freqs above 150hz, I'm fine. Means I can't run an amp on my regular speakers though, which sucks a bit, but the head unit is pretty good so it's liveable.

Personally, I think I'll be getting rid of the magnum as soon as I can afford to. I'm about $10,000 or more upside down on it right now. Yipeee...

Next car will be a Vette most likely.

 

Just a lil trick I do when i have this problem.....at the Rca's where they connect to the head unit run a ground wire from the connection point on the black rca to a ground in the car. Always cuts out noice...... Had to do it for my last car....

 

Well It turned out that it was the gain on the amplifier was truned all the way up. i swear I tunred it down when I had it in my last car but apparently not. But i re-wired everything and it sounds great now. Plus I put Fat Mat all inside the car so I get no rattle what so ever. If all the doors are close you can barely hear anything even at high Volumes. I Love It.

[IMG]local://upfiles/15737/8121A14A7CD345BFA487F9AD1491B998.jpg[/IMG]

 

My Subs.

[IMG]local://upfiles/15737/8723379949074A3696BC0807ADAFD392.jpg[/IMG]

 

Head Unit Install.

[IMG]local://upfiles/15737/F2329EA937DC48D5A71058533B0C3811.jpg[/IMG]