| JB,
I hope this helps.
The batt under the hood is for everything(all orig. electronics, all lights, and both rear outlets)
the batt in the bumper is setup as just a jump start battery.
the batt under the hood is larger than stock by far, the battery in the bumper is rated the same as the stock battery.
the seperator connects the two when the voltage on the primary battery reaches 13.8V, and disconnects the two when below 13.8V.
So when the vehicle is running, the alternator maintains both batteries
In the situation when the primary battery goes dead, then the momentary switch can be pushed to manually connect the two batteries, via voltage of the Aux. battery.
Thanks Vince |