I have an 89 GMC and the wipers don‘t work. I‘ve already checked the fuses, they‘re fine. Anything else I can try?
You probably need a new wiper delay circuit board. Not only does it control the delay of the wipers but if it is bad it will not allow them to work at all.
you ruled out the potential source. do this disconnect the wipers from the motor to rule out binding interior the wiper hands. If wiper hands have loose play it sounds to me such as you have a overheating motor or the circuit board interior the motor for the washers and motor is undesirable.
One of my customers recently had the same problem on his '91 S-10, and it was just the chassis ground for the wiper motor. It's not very solid, and happens easily from corrosion. Very easy to check too. Just run a jumper wire from the metal part of the case to a known good ground. (battery negative, or something you've checked for ground with a test light) If it starts to work, all you need to do is take out the mounting bolts and clean them up, along with the little brass tab that one of these bolts clamp down on. Of course if you just go ahead and replace the motor, it will start working anyway, because you've fixed the ground by accident. But this way costs nothing except 5 minutes of your time if that's what the problem is. ;-)
You probably need a new wiper delay circuit board. Not only does it control the delay of the wipers but if it is bad it will not allow them to work at all.
you ruled out the potential source. do this disconnect the wipers from the motor to rule out binding interior the wiper hands. If wiper hands have loose play it sounds to me such as you have a overheating motor or the circuit board interior the motor for the washers and motor is undesirable.
One of my customers recently had the same problem on his '91 S-10, and it was just the chassis ground for the wiper motor. It's not very solid, and happens easily from corrosion. Very easy to check too. Just run a jumper wire from the metal part of the case to a known good ground. (battery negative, or something you've checked for ground with a test light) If it starts to work, all you need to do is take out the mounting bolts and clean them up, along with the little brass tab that one of these bolts clamp down on. Of course if you just go ahead and replace the motor, it will start working anyway, because you've fixed the ground by accident. But this way costs nothing except 5 minutes of your time if that's what the problem is. ;-)
