You have problems getting started pretty often, have a winch, or are going to discharge the batteries deeply with an inverter, welder, or some other device. You are just jumping some power over to the fuse box power feeds so you can get the starter solenoids activated, and they, and the oil pressure switch will take it form there for you! The idea of the momentary is to supply power to the fuse box and starter switch even with a dead primary battery. It also beats having to get under your hood on sub 0° days to hot wire the solenoids so you can jump start your self! This is handy if you use radios at your camp site, have kids that get into things, have equipment that likes to slow drain things. Since it's a 'Momentary' switch, you can't 'Leave it on accidentally' and run both batteries down. *IF* Your primary battery is DISCHARGED, (Left the dome light on or something else on in the vehicle) you can self jump start by using the dash switch listed in diagram 4. When the vehicle starts, and the oil pressure comes up, the oil pressure switch will connect both batteries so the can both charge. When you hit the key switch, both solenoids will send CRANKING amperage to your starter. *IF* your primary battery isn't discharged, When you shut the engine off, or the engine dies, oil pressure drops and the second battery doesn't discharge. We use it to isolate the second battery when the engine shuts off.īoth batteries are tied together to charge/discharge when the oil pressure is up (Engine running), You don't want fuel pumping into a vehicle after a crash, so if the engine stopped, and the oil pressure drops, it opens the circuit. Click to expand.The oil pressure switch was originally to turn off the fuel pump in an accident where the engine died.
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