42/46RH pressure switch piping dilemma

67dartgtgo said

Thanks TrailBeast. I’ve read everything you have here on this I think and I’ve got the same switch’s including the vacuum. All adjustable and have considered running everything to the engine compartment but want to avoid adding more items in there. I have a lift so switch adjustment is no issue for me. I’d love to your wiring diagram though. I’m sure it would be a giant help.
I was under the impression you only need one wire, ground from the 3 pin, to each solenoid switch as per the PATC diagram and instructions. I noticed you have 2 wires running to/from your switches. Does the circuit have to be complete to ground at the switch?
I admit I don’t know crap about wiring this kind of thing so any help is appreciated.
PATC 727 to 518 / 46RH Conversion Kit. Click here for 727 to 46RH swap wiring diagram
View attachment 1715389636

Click to expand...

In your picture where it says "Nothing goes here" is not the case.
Those two terminals each go to a ground to activate the solenoids inside the trans when your adjustable pressure switches close.
(They always have 12v, but need a ground to activate them.)

My ground for those are switches inside the cabin that lets me disable OD and/or lockup by turning one or both switches off.
The pressure switches are disabled when the switches inside the cabin are off.
They still switch with governor pressure, but they cant activate the solenoids inside the trans because their ground is off via the relay, via the manual switches inside the cabin.

In reality, since my solenoids are controlled with relays the ground is cut by the relay when the switches inside the cabin are turned off, or the vacuum switch breaks the ground that activates the relay to activate the solenoids.

Not confusing at all, right?:D