Connect a length of cable from the ‘AUX’ (+) terminal on the isolator to the positive battery terminal of the auxiliary battery.Connect a length of cable from the ‘MAIN’ (+) terminal on the isolator to the positive battery terminal on the starting (main) battery.Note: To prevent the loss of vehicle electronic memories, radio presets & security codes, it is recommended that an “Electrical System Memory Protector” be used. Disconnect the negative battery cable (Earth) from the vehicle’s starting battery.Cable lugs should be crimped or soldered to the stripped battery cable and then protected with the heat shrink. To make the electrical connections, battery cables will need to be made to the correct length using cable lugs and heat shrink. Installation of the Battery Isolator– Connection 20mm² (4 B&S) for rear of vehicle / trailer mounted auxiliary batteries.14mm² (6 B&S) minimum for engine bay mounted auxiliary batteries (up to 3m).Auxiliary battery cradle & battery clamp.Charged auxiliary battery - Deep cycle recommended for most applications.Surge Protection - Provides surge protection for vehicles with electronic ignition/ management systems.Over-Current Protection – Protects the Isolator and charging system from over current damage, which could occur due to a short circuit in the wiring.Manual Override - If the starting battery is flattened and the auxiliary battery is charged, the electronic isolator allows the batteries to be manually paralleled to jumpstart the vehicle.Priority Charging for Starting Battery - Ensures that the starting battery is fully charged before connecting the auxiliary battery in parallel.It can be fitted to all 12V vehicle types. Easy to Install - The electronic isolator does not require any changes to the vehicle’s existing wiring.Batteries of differing voltages cannot be used.Battery Isolators are designed for negative ground alternator systems with batteries of the same nominal voltage.Follow all vehicle manufacturers’ instructions.Vehicles must be in “NEUTRAL ”or “PARK ”, park brakes “ON ”.BATTERIES PRODUCE EXPLOSIVE GASES - Ensure no sparks or flames are present.PLEASE READ THESE INSTRUCTIONS COMPLETELY PRIOR TO INSTALLATION.I know it has been done, Eric Sargent's guys did it on the white 200 in a recent video he posted. ![]() It also seems silly to use a relay (I guess technically it is an integrated circuit) to switch a relay, to switch another relay. ![]() I suppose I could use a Switch-Pros button set on momentary to switch an external relay to do this, but the idea behind the switch-pros is to get rid of as many of the extraneous components as possible. How would you accomplish this with a Switch-Pros setup with the minimum number of extra components? If I was using a regular relay, I think I'd just use the input/control (pin 86) to switch the ground (on pin 30 and 87). Positive makes sense for most accessories, but I need to link to ground for the SBI. I'm doing all of my accessory switching through a Switch-Pros 9100, which (as far as I can tell) switches the positive side. It has a blue wire that needs to be grounded through a momentary switch to "link" the batteries to self jump start. I installed a Redarc smart battery isolator. The intermittent does need to go to ground when the SBI is used for self jump starting, in the BCDC/SBI combo.
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