Though you do not say specifically, I assume that the wiper does nothing with the wiper stalk in any position. Correct?

Did you check the fuse? In the 1984's, the wiper motor is one the same fuse as the horn and the washer pump. I've had a few times where a fuse looks OK but on attemped removal the metal strip falls in two. Tricky rascals!

Fuse OK? Next check for power at the plug. The motor does not ground through the harness. There is a separate connection to the firewall via a brass piece from motor to under a mounting bolt which is invisible under that black gooey sealant. (It is rope caulk, BTW)

Looking at my 1984 wiring diagram book, there are four wires. One, yellow, is hot all the time from fuse #1. You should get 12v there, with the key in.

Next is a brown wire, which is hot in speed #1. From the diagram it looks like if you apply 12v+ there the motor should run.

Next wire is green which is hot in position #2.

Last is a White/black wire that is in the circuit during the parking sweep.

Actually, some motor failures are visible. I had a 1986 motor go out, and found that in the housing where it is tucked in close to the firewall padding, there was a dime-sized hole and somthing rattling around inside.

I believe that motor is the same from 1975 to at least 1988 and maybe newer. The only change I know of is in that ground connection. That makes the motor a junk-yard or re-cycle item, not an after-market item. I believe that used but good Volvo parts usually trump new aftermarket parts in many cases.

There is a relay in the intermittent wiper setting. There are six wires to it, and it is located above the driver's left toe.

Good Luck,

Bob

:>)