Just got my MSD Digital Window switch/ Help me wire it up!!!

This is how mine is wired:

Red: goes to a +12 volt source
White: goes to the Msd
Black: is ground
Yellow: is going to my relay's ground
Gray: ???? i don't have a gray wire. I have the MSD 8956 switch

You will need a relay because the window switches can't handle the power load of the nitrous system. They are only rated at like 1.5 amps

*EDIT* yes you want to use the yellow and not the gray

I believe thats the relay hes making sure you have. He wired his window switch yellow wire to the ground on the relay.

I wired my yellow window switch wire to the ground wires from the N20 solenoids and it works awesome.

I also wired a WOT switch into it too. That way if you're launching over the window switch "ON" rpm range the N20 isnt activated.

White to MSD tach output.
Red to switched 12v.
Black to ground.
Yellow to pin 85 or 86 on relay depending on which one has 12v to it.

http://www.nitrous-power.com/instruction pdfs/Electrical Instructions.pdf

follow wiring diagram 2

here is how mine is wired.

12+ to red wire of window switch
White wire goes to coil for tach signal
black wire goes to ground
gray wire gets capped
The yellow wire goes to one side of the coil of the relay. Can't remember the pin #.

My relays are wired like this. For the solenoid power I have a fused source coming off the battery to one side of the normally open contact on the relay. The other side of the normally open contact goes to the nitrous and fuel solenoids. The other wire coming off of each solenoid is grounded to the fire wall.

For the relay controls it is like this. 12v to my arming switch then to the WOT switch then to one side of the coil of the relay. The other side of the coil connects to the yellow wire of the window switch.

What happens with the window switch is that it will connect the yellow wire to ground when you are in the RPM window you set, the gray wire will remove the ground. Then if the system is armed and you are at WOT you will activate the nitrous and fuel solenoids. All conditions have to be met in order to spray.

brothergoat5 said:

White to MSD tach output.
Red to switched 12v.
Black to ground.
Yellow to pin 85 or 86 on relay depending on which one has 12v to it.

http://www.nitrous-power.com/instruction pdfs/Electrical Instructions.pdf

follow wiring diagram 2

Click to expand...

Nice link! That set-up looks textbook to me!!