Hi,

I just got a mallory 685 box and have the harness to splice into the coil. I am not 100% clear on how to wire the yellow wire for timing retard and the wire for the window switch operation into my system. My nitrous system uses 1 relay, FPSS and WOT switch.

Any help, or better yet a diagram, would be super useful!!!

michael_w_ma "at" hotmail.com

 

With my MSD, there is a 12v activation wire to retard timing. When it has power, timing is retarded. This taps into the 12v wire that feeds the nitrous solenoid, so it only retards timing when your N2O activation switch is on.

 

I wired the timing retard from my 685 to the WOT switch so when the WOT switch is activated it activates the timing retard. As for the window switch from the 685 I wired that to the ground on the nitrous soleniod.