Wiring a Battery Isolator

  • 1-3 hours
  • Intermediate
  • 25-50
What You'll Need
14-gauge wire
Electrical connectors
Crimping pliers
Car manual
Metal screws

Whether it is a fuel line replacement or wiring a battery isolator, you can accomplish many seemingly tough jobs on your own. If you find yourself in need of a battery isolator wiring, here are a few tools and materials needed, as well as steps that can help to guide you.

Step 1 - Turn Everything Off and Prepare

Begin by making sure that the car is turned off. This is an extremely important step so that you do not do any damage to the car and more importantly, to yourself. Then, allow the car to cool completely for about 20 minutes or so, especially if you were just out driving. You do not want to be working in it and then burn yourself or cause any electrical damage. Then, once the car is ready to be worked on, you will want to check out the manual just to familiarize yourself with everything that is going on so you know where to look.

Step 2 - Install Isolator

Now that you know whats going on under the hood, you can install the isolator. This is typically done in the engine compartment and needs to be hooked up to the actual metal part of the vehicle. Be sure before you do any installation or securing that you can close the hood with no problem and that all other parts work without disruption. You may want to have another person help you with this step to hold down the isolator securely as you drill. Carefully drill around the isolator attaching it to the frame with the sheet metal screws. Again, hold it on tight so that you can secure it completely flush with the frame.

Step 3 - Wire the Isolator

Once you have hooked up the isolator you can do the actual wiring. Keep in mind during this step that you have to disconnect the negative cable before you attach the positive terminal to anything so that you do not get shocked. Then, take the negative cable from your actual car battery and remove it. Next, check for the wires that are attached to the BAT terminal, which will be located on your alternator. All of these wires will need to be disconnected. Look for the terminal on the isolator that is labeled 1. This is where all of the wires from the BAT terminal that you just connected are going to go. Be sure that they are secure and tight when you are hooking them up. Then, cut a piece of the 14 gauge wire so that it fits between the alternators BAT terminal end and the end that is marked with an A on the battery isolator. Crimp on 2 electrical connectors that will attach BAT to A. Then use another piece of the wire to ground the negative cable of the car's battery to the frame.