what the hell is going on with my system?

[ride92]

Hello, I'm new to the forum and need some help trouble shooting some issues with my recent amp/sub install in my 2003 mazda protege5. When the car is running I get some wierd this happening to the sub. It pulses very slowly in time with the engine running. Anytime the engine fan kicks in the subs cone move quite a bit. I don't know why this happening. So please help me. The setup I have is a 8" kicker comp sub and a crunch audio p500.2 amp that I installed to my stock HU. The amp is under the drivers seat with power cable running up the drivers side to the battery with a inline fuse, the remote power cable is spliced into a wire on the factory harness that gets 12v only when the key is turned to Acc or on. The ground wire is bolted down to a spot that I sanded till shiny to the cars floor near the seat bolt. I am using the High level inputs for audio signal as the head unit doesn't have RCA's, they are spliced into the rear door speaker wires also under the driver side door sill. The power cable and highlevel inputs are close to each other for only about a foot and then go there seperate ways. Speaker wire is run to the trunk for the sub. I don't hear anything from the sub when it moves and the volume is all the way down. I've move the grounding location twice now to no avail. It only does it when the HU is on and the car is running, when I turn the HU off the sub does nothing even though the amp is still on. Disconnectiong the Input leads with the car running and the head unit stops the sub from moving. With the car not running but HU on and playing there is no problem. It seams like I am getting altinator noise thru to the sub (even though it makes no sound) when the car is running ( it moves even with volume all the way down). If anyone has an idea of what I can do to fix this problem, please I'm all ears. I don't want to damage anything because of this problem.

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[hornedfrog1985 5,000+ posts]

Holy paragraph batman.

 

[bubbagumper6 5,000+ posts]

The power cable and highlevel inputs are close to each other for only about a foot and then go there seperate ways

Could still cause signal issues. Best to run them on OPPOSITE sides of the car. If they have to cross, try and make it a 90 degree intersection.

 

[ride92]

I re-routed my power cable so that it no longer runs anywhere near the High level input leads and I still have the problem. WTF???

 

[WOT]

to hell if im reading that

 

[halfwaytohell 10+ year member]

to hell if im reading that

 

[phemps 10+ year member]

we needa teh cliffz

 

[k_schutte 10+ year member]

we needa teh cliffz

When the car is running the sub pulses very slowly in time with the engine running. Anytime the engine fan kicks in the subs cone move quite a bit. I don't hear anything from the sub when it moves and the volume is all the way down. It only does it when the HU is on and the car is running, when I turn the HU off the sub does nothing even though the amp is still on. Disconnectiong the Input leads with the car running and the head unit stops the sub from moving. With the car not running but HU on and playing there is no problem

 

[phemps 10+ year member]

sounds like possibly something induced into the rcas? did you try to ground your rcas to the back of the head unit? ive seen this do alot of weird shiit with them ungrounded. but either way it sounds like something to do with your rcas and headunit i think

 

[ride92]

When the car is running the sub pulses very slowly in time with the engine running. Anytime the engine fan kicks in the subs cone move quite a bit. I don't hear anything from the sub when it moves and the volume is all the way down. It only does it when the HU is on and the car is running, when I turn the HU off the sub does nothing even though the amp is still on. Disconnectiong the Input leads with the car running and the head unit stops the sub from moving. With the car not running but HU on and playing there is no problem

1. Thanks for doing the summary for me, That's what I wanted to say but figured I'd give as much detail as possible right up front.

 

[ride92]

sounds like possibly something induced into the rcas? did you try to ground your rcas to the back of the head unit? ive seen this do alot of weird shiit with them ungrounded. but either way it sounds like something to do with your rcas and headunit i think

I don't have RCA's going to the head unit. I tapped into the Rear door speaker wires in the loom under the drivers side door sill in able to use the High level input built in the amp. The Head unit is the stock radio one.