I have a 1984 mustang lx v6 with wireing prob will putting a new hornes fix it help please?
Where is this electric motor sounds coming from ?? On the headlights, check the ground straps. There is one strap for each light assembly, & it is basically right behind the assembly. In older cars, the screws that hold the ground straps to the sheet metal tend to vibrate loose, plus the sheet metal around the screw can rust. On this noise, if you cannot pinpoint where it is coming from, start pulling each fuse in the sub circuit box under the drivers side dash board, until the noise stops. Then see what the circuit is & start trouble shooting from there.