[Lew Silverman]

I'm guessing you have a battery(s) mounted in the bed on the S-10? Using a continuous-duty solenoid to replace a Cole-Hersey style master cut-off switch would require you to run power to a toggle-switch of some kind inside the cab of the truck, somewhat defeating the purpose of the master-switch disconnecting all power at the battery. Better to have one mechanical disconnect at the rear for safety's sake.