I've had the field wire on my 94 Toyota PU for 10 years now. I turn it on when DFCO, down hill etc. Turn it off on acceleration, up hill, etc.
Biggest problem is training my wife (3-4 time a year she drives it) to turn the switch on and leave it on. Finally took a sharpie and wrote on the dash "Switch Up"
I also go through batteries. 18-24 months is all I get doing this. But buy 3 year batteries and you get a new one basically free. I should probably get a deep cycle / yellow/blue top sometime.
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