You're on the right track but I don't think you need all that jazz. I think you just need a plain old 5 pin automotive relay and 2 time interval relays.
+12v constant
+12v switch
N.O.
N.C.
1. SWITCH OR TRUCK IS OFF - CUTOUT CLOSED. NC TERMINAL IS ENERGIZED, "NC" TIR ENERGIZED BUT TIME CYCLE IS COMPLETE AND AWAITING RESET.
NO --- TIR --- TO CUTOUT OPEN
NC --- TIR --- TO CUTOUT CLOSE
1. SWITCH IS ON - CUTOUT OPEN
NO --- CLOSES --- ENERGIZES TIR --- OPENS CUTOUT AND REMAINS ENERGIZED
NC --- OPENS --- RESETS TIR ---
SO, 2 OF THESE:
e-Product Data Sheet
AND 1 5 pin relay.
---------- Post added at 01:48 PM ---------- Previous post was at 01:46 PM ----------
can someone make a wiring diagram of that? makes sense in my head but it's always to see it on paper. let's solve this mystery once and for all. if it's gonna work i will be the first to try it.