lil problem drivin me nuts

[P2KMax 0]

I have a 2000 Max with the bose system i change the hu, and i added 2 12's american bass :| i dont know if they good but they hit ok my problem is when ever i turn on the car i get motor wined drivin me crazy and when i turn off the car the subs make a boom soundi dunno if its my amp/wirein/radio aint help/tips is gratefull.

[johnecon2001 82]

It's a common problem. Usually caused by a bad grounding point for the head unit. Try a new spot. Don't use the factory ground.

[P2KMax 0]

thats the thing i didnt use the factory one..lol ill try grounding it to some other spot

[patented17 21]

Be sure to grind away paint on your grounding spot.

[Big E 4]

Did you make sure to clean and remove all paint and dirt from the new grounding spot?

[P2KMax 0]

nope :| ill do it tomarrow..lol