Fitting Guide for (small) Isolators DBE3W - optional In-Cabin Display Procedure

Find a suitable position near either battery. Mark holes for the isolator mounting bolts (not all bolts need to be used - do not twist or bend the isolator just to get the 3 bolts fitted. Drill holes and mount. Be careful not to over-tighten the mounting bolts.

Run 6mm wire to the main and auxiliary battery positive terminals, noting which terminal is which on the isolator. Run a 3mm wire from the earth terminal to the body making sure to get a good earth connection. If the In-Cabin remote display is to be used, connect the cable and run wire/globe to the dash location. The chrome surround can be unscrewed. Drill 8mm hole and fit.

Intelligent Isolator Test Procedure

Once the main battery exceeds approximately 13.0 volts the isolator will connect the auxiliary battery into the charge circuit. This can be seen by the voltage on the auxiliary battery rising to about the same voltage as the main battery. The indicator light turns 'green'. Note if the auxiliary battery is flat the isolator may alternately connect and disconnect the batteries depending on the ability of the alternator to supply enough current to maintain the voltage of both batteries above approximately 12.2 volts. The red/green light will off/on as the isolator disconnects/connects.

Voltages should increase to around 14volts when fully charged. Assuming the batteries are reasonably charged, start engine and increase engine speed well above idle. When the light turns green (indicating the isolator is connected and both batteries will have the same charge voltage), turn the engine off and turn on the headlights. Check the voltage on the main battery. Once this drops below approximately 12.2 volts the isolator will disconnect the auxiliary battery, this can be seen by the voltage on the auxiliary battery being higher than the main battery. The indicator light turns from green to red.

Alternatively, with the engine off, put a load on the auxiliary battery. Once its terminal voltage drops below approximately 12.2 volts the isolator will disconnect it from the main battery. This can be seen by the higher voltage on the main battery. The indicator light turns from green to red.

Load Test Procedure

Connect a battery load tester (50amp) between the auxiliary +ve terminal and earth. Run the engine at 1500rpm or greater so that the isolator is connected, ie output above 13.0 volts and the indicator light is green. Measure the voltage between the main and auxiliary terminals of the isolator. This should be less than 0.2-0.25 volts. Greater than this indicates excess resistance in the contact set - contact 4WD Systems.