Whoever installed the amp has crossed wires in your fuse box. The power to run the wiper motor is turned on and off by a relay, not by the actual switch you use.
They have crossed wires so that the relay is stuck in the energised position. The power surge that blew out your lights might have fused the relay.
Remove the relay and see if the wipers stop. If so, get a new relay, if plugging a new one in makes the wipers come back on by themselves, you'll have to check the wiring under the dash to see which one is sending power to the relay when it shouldn't be.
Bear in mind, one leg of the relay should always have power (which is sent to the wiper motor when the relay is activated). The other legs usually don't have power, grounding one will cause the relay to activate, powering one of the unpowered legs.
You'll need to check both the ground and hot wires around the relay's plugin spot to see how it's crossed.
Monday, June 4th, 2007 AT 6:10 AM