It is raining and I put on my wiper and they work good for a bit and then they start skipping jumping and when I put them on pulse they pulse for a bit and then go into regular on mode for as bit and then back to pulse, what gives here? thanks inadvance for any help.
Truck is 2003 GMC 3500, 4x4 6.0 V/8, auto trans

 

I might be wrong but it sounds like the combo switch is going out. I know it's been an issue with GM products for years. Does it work ok when in normal low or high?

 

chatters in low as for high I have never used it on this vehicle or any other vehicle as it just throws the water around. thanks