It should be down to 12.8 or below and should remain constant. You should see the isolator light turn off. ) You will hear a light humming noise once it stops your isolator should cut off. The power supply circuit provides a steady and reliable flow of energy from the primary battery to the secondary battery. Mine was charging around 13.9Īfter this, make sure that the isolator cuts off by turning the car off and turning the head lights on for a sec (to speed up the process otherwise you have to wait till the volts drop below 12.8 and the isolator will stop charging. The dual battery isolator wiring diagram is composed of two main components: the power supply circuit and the connection between the two batteries. Use a volt meter to check that the battery voltage is above what it was when you first checked your ground connection. Start the car and check to see that the light is on and the isolator is sending power. ![]() So, I used a vice and it worked great.Ĭonnect all your inline fuses to your wires.Ĭonnect the isolator ground, then starter battery terminals, and last, connect the auxiliary battery terminals.Ĭonnect the ground terminal back on the starter battery. I didn't have a crimper for the large terminals. Strip, crimp, and heat shrink your wires, with the provided terminals. The other positive will run from the isolator to the auxiliary battery. You need one positive wire running from your Isolator to your starter battery. Get 2 x 100 Amp inline fuses either here from Amazon or at your local car stereo store. Check by putting it in two different grounds and checking a volt meter to see if the volts remain the same. Make sure you have a solid ground connection on your auxiliary battery. For once, a convenient placement for battery right at arms reach under the driver seat. ![]() This seems like a daunting task but it’s actually quite easy and I enjoyed learning along the way. I recommend it for the amount of wire they give you alone. I bought the Keyline Dual Battery Isolator on Amazon. An isolator basically sends a charge to the auxiliary battery, from the alternator, after the starter battery is charged. 4x4-grade solenoids generally have higher-amperage wiring to the second battery (often of a similar size to the vehicle’s starter cables in fact, many solenoids used for dual-battery tasks are the same tech as some older-vehicle starting solenoids), so there’s little risk of frying wires. ![]() A great way to charge dual batteries while on the road is through a battery isolator.
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