I have a 1987 240 wagon. When I turn on the windshield wiper, nothing happens - not on any of the switch settings.
I have checked the fuse and replaced the motor, neither was the cause.
I put a multimeter on the connector block contacts. None showed any voltage, although both sets showed a decrease in resistance when the switch was on.
Which is the cause most likely to be:
1) the intermittent mode relay; 2) lack of a ground somewhere; 3) bad switch on the stalk; or 4) something else?Thanks.
First, clean the prongs at the fuse and the fuse itself with a small wire brush or sandpaper, and test with a test light to rule out fuse issues.
Then, the check for a good ground at the wiper.
There should be a flexible metal piece at one of the bolt points: make sure it is corrosion free, as well as the attaching point.
You might run a separate ground from another point on the wiper body to another grounding point on the firewall.
If that isn't it, I'd check the wiper stalk next with a VOM, to see if the readings change at the prods when you change stalk positions.
Actually, the easiest is to substitute with a spare which is known to be good.
Finally, substitute the relay (tucked under aluminum shield under carpet under driver's left foot).
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