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Frank 5/12/2017

1998 Mercury Grand Marquis GS 8 Cyl 4.60L

Body & Interior

My windshield wipers only work on high

1 Answer

Teddy B

Teddy B 5/12/2017

If your going to work on the problem yourself

Look at a wiring diagram

First look to see if the motor has several speeds on an internal
circuit board -- if so, then manually put battery voltage to the various
wires on the motor terminals

If the motor can be run with all speeds,then plug it back in & move on
to test the outputs of the switch on the wipers stick & any variable speed
module possibly under the dash


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