This technology has dramatically changed the face of environmentally-friendly driving options. Drill a hole just big enough for the wire in the bottom/side of the JK fuse block cover, feed the wire through and put silicon around it to seal the hole from dust and water.Ĭonnect the other end to the small trigger terminal on the solenoid.A hybrid vehicle uses both gasoline and electricity. This will trigger the solenoid to turn on when the engine is running. Install the inline fuse/wire in the JK fuse block in the location indicated on the picture below. Check hood clearance, and make sure neither terminal will touch any part of the body nor hood. You’re going to run heavy positive wires to the large terminals from each battery, so keep it close to the batteries. ![]() These will always be connected with large gauge wire, and never need to be disconnected.įind a good spot to mount the solenoid. Whichever battery suits those wires the best can be your Engine Battery.Ĭonnect the negative terminal of both batteries directly together. If your tray mounts the batteries side-by-side or front-and-back, check how well the stock jeep wires for the positive and negative will reach each location. Install the two batteries in the tray – when using the Nemesis Industries tray it’s recommended to install the Hose Battery on the bottom, and the Engine Battery on the top. Mounting the Nemesis Industries dual battery tray in the JK I used a scrap piece of a right angle bracket I had left over from something else. Depending on what came with your solenoid, you might need to make a brake to mount it.A – we’ll stick this in the JK fuse block to trigger the solenoid when the engine is running.I really like the kind that have a large post for connecting the wires of all the accessories I’m running ![]() You’ll need one black wire to connect the two negative terminals together, and two red wires to connect the two batteries to the solenoid. Heavy gauge wire to connect the batteries, works great for this.The following instructions will not use that switch so they’re generic for all solenoids) (Note the Painless kit comes with everything you need, and a switch so you can control when the batteries are connected. I’m running a kit from specifically designed for this purpose, and it’s excellent. The batteries mount on their side, saving previous space. I have the Nemesis Industries tray which is specifically designed for the Optima D34 batteries. As a bonus they can be mounted on the side which is a win in the cramped JK engine bay and opens up all kinds of mounting options They are specifically designed to handle the kind of charging and discharging the House Battery is going to go through. my has a setting that will turn the fridge off when it senses the House Battery is too low) Make sure you turn your electronics off, and/or buy devices with a voltage cutoff (i.e. The system described here does nothing to prevent excessive discharging of the House Battery – if you leave multiple big camp lights on overnight, your house battery will completely discharge, which is usually not good for the longevity of the battery. ![]() A cheap solenoid might save $30 now, though given it’s the fundamental piece of the puzzle, I recommend buying a good one that will last a very long time.Because the two batteries will be connected in parallel when the engine is running, it’s highly recommended to use two identical batteries to ensure even charging from the alternator.This “isolator” is commonly a large amperage solenoid that is triggered with an ignition hot wire. When the engine is not running, we want to separate the batteries, so that if the House Battery is completely discharged, the Engine Battery remains unaffected and will still start the vehicle engine without issue. When the engine is running, we want the batteries to be connected in parallel (positive to positive, negative to negative) so we still get 12V, and the alternator can charge both batteries. The isolation part refers to how the batteries are connected and disconnected with the engine is running and when the engine is not. (Let’s call this battery the “House Battery”). Having two batteries means one can be used only to start the vehicle (let’s call this battery the “Engine Battery”) and the other can be used for all your electrical needs like a fridge, camp lights, charging of devices, running an inverted etc. The setup looks complicated and difficult in photos, though it’s actually very simple. Isolated dual batteries are a must in any Overland vehicle.
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