42/46RH pressure switch piping dilemma
The ground for the solenoids in the trans grond through pins 1&3 on the connector.
The center pin is 12v when the key is turned on.
No, the switches don't need a ground as they are only a switch that the voltage passes through via the terminals.
I do have a suggestion though.
Maybe run a tube from your 90 on the trans up the back of the transmission and mount the switches on the back of your intake. (If your switches are adjustable you'll be glad you did.)
All that stuff hanging down there on the trans is going to cause problems.
If not from vibration, then objects hitting it. (Think a section of truck tire bouncing through under there and then you are spewing trans fluid. (which is highly flammable by the way.
Also on the wiring for the switches they can run from the connector on the trans forward and up instead of back and down.
You can use switches inside the car to manually turn off OD and/or lockup by breaking thier grounds.
Thread sealer on all npt fittings is a real good idea.
I used relays to ground the solenoids and then the expensive adjustable switches to tell the relays when to activate.
This takes the load off those switches.
Number 4 in the pic is a vacuum switch to kick out of lockup under heavy throttle.
It just cuts the ground to the lockup relay when intake vacuum drops to a certain amount. (It's also adjustable, so you can set how much throttle it takes to drop lockup out.
The ground for the solenoids in the trans grond through pins 1&3 on the connector.
The center pin is 12v when the key is turned on.
No, the switches don't need a ground as they are only a switch that the voltage passes through via the terminals.
I do have a suggestion though.
Maybe run a tube from your 90 on the trans up the back of the transmission and mount the switches on the back of your intake. (If your switches are adjustable you'll be glad you did.)
All that stuff hanging down there on the trans is going to cause problems.
If not from vibration, then objects hitting it. (Think a section of truck tire bouncing through under there and then you are spewing trans fluid. (which is highly flammable by the way.
Also on the wiring for the switches they can run from the connector on the trans forward and up instead of back and down.
You can use switches inside the car to manually turn off OD and/or lockup by breaking thier grounds.
Thread sealer on all npt fittings is a real good idea.
I used relays to ground the solenoids and then the expensive adjustable switches to tell the relays when to activate.
This takes the load off those switches.
Number 4 in the pic is a vacuum switch to kick out of lockup under heavy throttle.
It just cuts the ground to the lockup relay when intake vacuum drops to a certain amount. (It's also adjustable, so you can set how much throttle it takes to drop lockup out.