The amount of energy drained probably isn't significant but the voltage sag due to the starter motor might be. The starter, glow plugs and FICM will will draw current from the camper & medical batteries. 18AWG wire is good for this.Ī drawback of using relays is that current flows both ways. The simplest way is to hook them up to a circuit which is hot when the ignition's on. Now hook up the relay coils so they turn on when you want them to. You'll also need two small conductors for the isolation relays if they're mounted in the camper. One for each battery positive terminal one for the two negative terminals. You'll need three large, high-current conductors. It's not necessary to run two independent ground wires to the two auxiliary batteries.Īnderson connectors provide a convenient quick-disconnect and can handle large currents: NTE R51-1D70-12F 70A 12 VDC SPST Automotive Relay 075-140Ĭonnect the the medical battery to the other alternator using another 70-Amp relay, two more fuses and another 6AWG copper wire. Using relays is simpler and less invasive, particularly with two alternators and two starting batteries:Ĭonnect the camper battery to one alternator using two 80-Amp Maxi® fuses, (one right at the alternator one right at the camper battery) a 70-Amp relay and 6AWG copper wire. If you would like the camper and the medical batteries isolated from each other when they're being used, you'll need a 3-output battery isolator. The battery isolator you have isn't big enough. Make sure the voltage regulator sense lines are on the battery (output) side of the battery isolatorĬonnect the auxiliary batteries to the other output of the battery isolator.ĭo not reconnect the alternators to the starting batteries or you'll defeat the whole purpose of the battery isolator. Also, I am questioning which cable from the alternator goes to the isolator and whether I should use a real battery cable to connect the isolator to the battery.Īny help at all here would be very welcome.Dual-alternator, dual-battery wiring isn't much different:ĭisconnect the batteries from the alternatorsĬonnect both alternators to each other and to the input of the battery isolator.Ĭonnect both starting batteries to each other and to one output of the battery isolator. There is room outside the engine compartment and inside the LF fender but I would have to make some holes in the fender bulkhead to do this. Does an Optima Red Top gain enough room anyway? I have considered going to a smaller battery to gain some room but that would be the last resort for me. The problem is that I am searching vainly for a roomy site near the battery to install the isolator and there ain't none! Has anyone done this particular modification? I would hate to have to put the isolator too far away and have to run long cables to the alternator and battery. I have an isolator, 25-feet of 8-gauge cable, and a 50-amp circuit breaker in hand. The 7-pin plug is all set up for it but isn't connected to the car battery yet. Hello all: We are now towing a new small trailer (1900#) and I would like to be able to charge the trailer battery while we're on the road.
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