[FIXED] 94 Suburban C1500 wipers

5.7L, 360,000 miles. Wiper module (controls wiper, washer, intermittent) 25a fuse keeps blowing. I haven't had too much time to look at it. But if I put a fresh fuse in the wipers will run for a while. After running the wipers on intermittent for a while, intermittent drops out and they will only work on LO or HI. After a few more minutes LO will drop out out and it will only work on HI. After a little longer HI will drop out and then wipers totally inoperative on any setting. Fuse will blow right away if I engage WASH, which engages the wash sprayer and runs the wipers on HI.

I am wondering if the wiper module is drawing too much current. My question is, how much current should a good wiper module be drawing? I was thinking of measuring the amp draw by putting an amp clamp around the wiper module power supply wire. Am I on the right track?

I definitely think you're on the right track with your current measurement. But, I've never actually done a current measurement on a wiper motor, so I don't have a good point of reference for you. I'd suggest starting with a measurement of all speeds with a fresh fuse and get a baseline for comparison. By the time you get back to popping the fuse, you might have a good idea of what the motor is drawing.

The other thing that comes to mind is a binding wiper arm assembly, causing the motor current draw to spike as it tries to fight against the arms. You'd have to pull the cowl to check for this, of course, but it's another explanation for high current draw.

I FINALLY had a chance to get back to this. I had been feeding it fuses the last few weeks. A bad practice I know, but what can I say.

Yesterday my wife said this HAS TO BE FIXED A.S.A.P. , so, after inspecting the wiper arm drive assembly, which seemed to be in good working order judging by ease of hand operation, I called a bad wiper motor. Not exactly scientifically rigorous, but I thought it was a better than even bet, and I was out of time.

Had my 11yo daughter install a new unit from Autozone. Wipers working again, no blown fuses.

Thanks again, Tyler, for your feedback, my apologies to all for taking so long to post back.

Happy to hear it! Thanks for the update.

Nothing wrong with your methods, IMO. Sometimes, you just gotta take the plunge and move forward with the repair. Nothing wrong with that at all.

Your 11 year old did that swap? Impressive! There are adults who'd struggle with that job. :lol: