Did you check the ground wire at the radiator support with 3 black wires attached? If so, then check each of the wires for internal breaks. Also check that the radiator support is actually grounded.
The buzzing is usually caused by a weak ground or a resistance to ground. Since the relays inside carry a high current, grounding is important. Weak connections from the radiator support to the body can also be present.
Saturday, July 25th, 2009 AT 6:21 AM