Originally Posted by Lurius
If you only want to use a push button(with an arming switch of course!).. I wired mine as such: It takes a complete electrical circuit to open the solenoids. negative and positive both.
Your rocker style on/off arming switch would be positive.. when on, the positive is giving power to the solenoids..they wont open until the circuit is complete and you have a ground..
The pushbutton does the same as the arming switch, except instead of connecting to a positive 12v sourse, you ground it.
Then when you are ready to race, arm the system by flipping your arming switch(positive, +) and then when ready to spray complete the circuit, and open the solenoids with the push button ground.
I couldent use a WOT switch as I have an electric throttlebody.. so I had to go thew push button route. Wouldent go any way.. I like having complete control.. especially if you only want to spray through one gear or so.. or maybe to give your low end a little more spunk.
I had a system wired up back in 1988 (carbed 350 SBC) that had a micro WOT switch hooked up to the carb linkage where it could not activate unless your pedal was on the floor, but the actual spray was activated via a button on the NOS T-handle that was also wired in so that you couldn't spray until your thumb pressed that instant on/off button.
The T-handle was made by NOS and was pre-wired for this purpose, and just replaced the T-handle on the B&M Magnum Shifter for auto trans. Somehow my wiring Guru wired it up so:
(1) You armed the system with one switch.
(2) You had to have it @ WOT to spray.
(3) You also had to manually press that button on the shifter to spray.
You were on your own to not spray to early, I relied on the tach and never hit the button below 3000 RPM. This setup worked well, for an old school setup where window switches were unknown to us. Of course our fuel injected computer controlled systems are miles ahead of the old ways, and I would never
spray without a Window switch, FPSS, and all the goodies we have access to now.