juts get a capacitor its as easy as that

Cheers!

a little cylinder thing that attaches to the coil neg then to the body of the car, or from the altenator lto itself .... dont know what they do or that they ever needed replacing ......

yeah its made of wax paper and tin foil the store smooth and compress so you could put it inline/ in series with your power wire

is a capacitor the same as the thing -filter? i'm talking about ?? and do they wear out ??? aaaaannd why would it be now be making the noise with the amp and not before hand ???

sorry for all these q's but stereos and amps are beyond me and electricity's invisible and it bites so i tend to leave it alone

yeah same thing um headunits can pick up random frequencys and the capacitor pretty much gets rid of them

where do i get a capacitor from ? and should i need to get one for the amp ??

um just any electrical store nah dono why an amp would do it but headuits can do. some headunits have capacitors in them. you can buy larger capacitors for the amp but they are just to help your battery out from the constant drian of the amp. have a look on www.howstuffworks.com

Condensers are on points and alternators.
Capacitors store power for voltage peaks.
Amplifiers do exactly that - amplify
If the radio has noise or is picking up noise - the amp will just amplify it.
Turn the gain down

Since the problem went away when the ground was connected to the battery, try replacing the ground strap from the battery to the frame to the engine block and make sure the contact points are clean.

I don't recomment spiffy ground wire kits, but you can run some additional ground points all on your own and it'll help a little with spark strength and may make headlights brighter.