Installed an Alpine 7987 Deck into a freinds car. 99 hONDA ACCORD. everything works fine. but when he turn on his headlights, he get a whinning sound. any ideas where i should start trouble shooting?? it previously had a rocksford deck in there and had no problems wat so ever. hooked up his harness to the alpine and he is gettin the whinng noise.

Note. It only happens when the headlights goes on. I try disconnectin the illumination cable but still same problem.


thanx for readin

 

is there just the deck ?
if so go with a new neg(-) also look at the neg though the car you can go as far as running a new neg off the bat's neg(-)

 

try grounding the hu to a differnt location

 

In my opinion it seems that the deck can't isolate the ground well enough to eliminate the noise...when the ground resistance of the RCA's-@ amp and the Decks ground at front of the car...are different in ressistance values this creates impendances that allow noise to enter through the weaker impendance value...possibly deck sharing same ground as Light's etc.

You can try grounding the Rca's (-) to the Decks ground...this should eliminate the difference of ground ressitance values at the two different points in the car....when the headlights are turned on.