1998 Dodge Caravan Turn Signals.

Hey guys, My friend bought this van last week and when he brought it to me he said he had an electrical problem. So the problem he is having is someone has what apears to be grounded switch running to the relay under the hood to operate the winshield wipers because, the combo switch is only working for the wiper speed, and high beams tugle. No turn signals, No 4way flashers and the sitch will not signal the wipers on an off. So I have tryed replacing the como switch and it did not. Help What could it be?