I have a 99 Grand Marquis - any thoughts on if it‘s the switch or the motor and what do I have to take apart to find the motor?
If it works at high speed, it is not your motor. There is no separate wires for medium and low speed like some are telling you. It is either the switch, which is only sending a full 12 volts on high setting, or the resister control package which is sometimes separate from the switch. Essentially the low and medium speed settings are just sending 6 and 8 rather than 12 to the motor. You can see if it's getting to the motor if you have a volt meter. If it's the compound switch on the lever on the steering wheel, it can be a bit complicated to change out.
Pull the connector loose from the motor, and test the voltage between the Dark blue wire with the orange stripe and the Yellow wire with the red stripe, with the key on and the wiper switch in the low position. The two wires you are going to check are the second and third wires from the right when looking at the rear of the connector with the latch facing upwards. If you have 12 volts here, you need a motor. I did a 99 yesterday for the same problem.
So the wiper come off the windshield even as driving quickly not with the wipes on severe % good? if that is the case attempt bending the wiper arm somewhat. grab the wiper contained in the spot the position it flow to a flat bar.gently push the end of the arm not the blade inwards the windshield. flow sluggish it may take some tries. If this fails to the finest option the issue you may want to favor new wiper hands. The spring lower than the arm looses rigidity and shall we the wipers drift on the air flowing over the hood.some people have had used a malicious program protect at the front of the hood to regulate the air bypass too. very last you may want to attempt the wiper with the air foils on them yet ought to of the time they finally end up purely being for instruct. solid success desire I helped GM tech for twenty years
