Wipers only work in intermittent mode and won't change speed when turning switch faster settings. Swapped relay in Power Distribution Center 77 - I-Wipe Relay with 78 - Wiper - Hi/Lo Relay and have same problem. Both these relays seem to be the same.

 

Moved to the correct section. Could be the switch.

 

Is there a way to test and see if the switch is functioning properly or not?

 

Search for Multi-Function Switch on the forum to see what can go wrong with these.


Turn signals generally take a dump first, then the high-low beam switch. But there is so much going on in there that anything can be the first to go.


What year is your truck? I think I have a couple for pre-2007 that I pulled at Kenny U-pull that I could make yours. (I'm in Ottawa too)


Had an '06 so I grabbed a couple, I now have an '08 so the switch is different.

 

Yeah it ended up being the turn signal switch. Got it replaced and everything works great now. Thanks all.