This evening after the sun went down, I cracked the cowl on Peer Pressure to start troubleshooting the wiper issue. I ran the engine up for about ten minutes in the afternoon when I got back from Harbor Freight; in the bag was a battery charger and a test light (along with an oil catchpan and an air fitting for my compressor).
Looking over the connector to the motor, I put the test light on it with the key at ACC and the wiper knob on low. After I found a consistent ground, the hot wires tested good. Puzzling.
I put my tester on it and got power in an acceptable range. More puzzling; it was looking like the motor was bad. I peeked under the cowl to size up the bolt positions, and…
…realized the wiper arm was sitting on the bottom of the inner cowl. Which meant it wasn’t connected at all. I reached in and verified it was completely loose. I cleaned the contacts in the connector with some sandpaper, hooked it back up, got back in the truck and turned the wipers on low. Immediately I heard the whirring of the motor. I’d never checked it with the engine off, so I celebrated with a smack to my own forehead.
Now the problem is getting the motor off the mount so that I can access the arm linkage enough to slide a spare clip on the housing. As I was coaxing the first of three bolts off the ladies called me in to dinner, so I tightened everything back up (the forecast is for 0% rain for the next couple of days), hauled all the tools inside, and called it a night.