wipers

[worthirt_99]

What is the best way to test the wiper system to see what's wrong, my wipers aren't working, but the fuse is fine.

I have an 85 c-10 with wiper delay

[BLE 'BURBAN]

Most common problem is the wiper motor itself, then the switch.Last is the control module.

[seanconnery]

Ahh. This is true, but not always. I went through an ordeal with this a couple months ago. My fuse was fine too.

I started by removing the motor and putting test leads on the terminals and trying each function (lo, hi, and park) running off the battery. I think the diagram for the terminals is in the Chilton book. I know it is definitely in the factory service manual. If each function is working properly, then you can eliminate the motor.

Next I tested the switch with my multimeter set to the volt setting. The colors going into the switch are decoded in the factory service manual if you're lucky enough to have one (I found one on ebay for $10.) Use the colors to put the positive lead where it belongs on the switch, and ground to the dash. Through trial and error, I found that the screw holes for the switch in the dash make a good ground. You should get readings.

To make double sure, I also did the same thing with the delay module plugged in.

When I did all this, I still had no working wiper system. I ended up taking the truck to my local mechanic and had him take a peek at it. He called me back a couple hours later to tell me that he tested each circuit in the entire fuse block and found that the circuit for the wipers was bad INSIDE THE FUSE BLOCK. Therefore, the fuse couldn't blow in the first place because the the circuit was already bad. He ended up making a new circuit and ran an inline blade style fuse holder up to the switch. Everything works fine. It's hooked up just like the factory.

I hope this helps out.