alternator whine through amp?

hi guys, quick question thats prob been asked a thousand times befire but, what do i need to get rid of alternator whine through my amp, and stereo (thought id heard it before fitting amp last night) its been a very long time since i last heard this noise and its bloody annoying not to mention loud.


any advice please

thanks in advance

chris  :dontknow:  

Sounds like one of the audio wires is touching an earth somewhere

how are the amp cables routed??

you should always (but most people dont,) run the cables on oppostie sides of the car, I usually run the power cable down the passenger (through a grommet behind the fusebox,) side and the phono, rem and speaker wires down the drivers side.  Thats the first port of call.

you can buy interference suppressor boxes from hellfrauds etc and these plumb straight into the power feed to the stereo.  Which is another point. I find with mk1's that the stereo wiring isn't really up to modern stereo power needs and they are prone to overheating and cutting out.  Try running a length of fused (fuse to the battery end) wire to the stereo power feed, and an earth lead straight to the earth "flower" above the fusebox, or behind the dash if that one is full.  There's usually one slot free at least.

if you still have interference it could be the amp itself is not broken, as a mate of mine had one that actually allowed you to listen to the alternator spinning through the sub!!! once we changed the amp it was fine!!!  They have built in noise suppression circuits so this could be the cause.

Jon.

or another common and most likely cause is a bad earth at the amp that will cause the tracks on the pcb to melt. it can be in the amp or the head unit. seen this loads of times before.

My friend had this issue you can get a filter for the amp input in the back of your stero i'll try find out what it is i have one in my garage. Could be a ground loop isolator that rings a bell?

Regards
Neil

I was rite. an elephant never forgets…….about three dollar off ebay!!!

Happy days

Dont know whether it will sort but its worth a dabble at that price.

Neil