Tow/Haul Button Wiring Question

[farm boy]

Tow/Haul button has been missing since I bought the truck. Looks like they tried to pull the old button to maybe fix it but jacked it up instead.

I can see 2 wires inside the shifter end. They aren't touching. But are too far down in there to reach and install a new button. I believe I'm gonna have to replace the whole shifter.

Can anyone tell me if the tow/haul is activated when the wires are touching or not touching? Seems like it would not be activated when the wires aren't touching, but I'd like to be sure.

 

[Mark Kovalsky]

When you power up the truck tow/haul is off. The PCM watches for a momentary contact, it isn't an on/off question. Each time it sees the ground connect it switches the state. So the first time it sees ground it turns tow/haul on. The next time it sees it it turns tow/haul off. If you were to leave the wires connected tow/haul would always be off, the same as if you left them disconnected.

 

[farm boy]

Thanks a lot Mark! Makes perfect sense.