by | Mar 6, 2020 | Maintenance

Jeep JL/JT Fuse Box

Eventually, you’re going to need to get into your Jeep Wrangler or Gladiator fuse box.  Whether it’s an electrical device not working or your dashboard has lit up like a Christmas tree with warning lights, it will happen.  In fact, it just happened to me this week.  In this article, I’ll cover the location of the fuse box, the layout of the fuse box, spare fuses, how to reseat fuses and where you can get a fuse box quick reference chart.

Jeep Fuse Box Location

The Jeep JL and JT’s fuse box is located on the passenger side of the engine bay.  It is between the main battery and the firewall (see Image 1). To remove the lid, press the two clips towards the middle of the fuse box and then lift the lid (Image 2).  You will have to slide the lid towards the side of the Jeep a little to get it clear of the fuse box wiring.  There is a fuse list and diagram on the bottom of the lid (Image 3).

The accessory battery is under the fuse box.   Even after disconnecting the main battery, the accessory battery still provides power at the fuse box.

Note: I have installed the Genesis dual battery kit so my battery layout looks slightly different in the photos than a stock Jeep (first image).

Jeep Fuse Box Components

In Image 4 you can see the main components of the fuse box.  The upper circle is a fuse array, more on this later.  The yellow thingie is used to pull fuses.  Yes, yellow thingie is the correct technical term.  (Although less experienced individuals might call it a fuse puller.  They likely get confused because it is used to pull fuses, so hence they think it is a fuse puller.)  On the right is a relay and at the bottom, you can see a variety of fuses.

There are also some spare fuses in the box.  They are mounted in taller clips as you can see in Image 5.  There are also supposedly three spare relays, although my Jeep did not have any–bastards.  In the circle on the left and also slightly above and to the right you can see my three empty clips.

If you look at the diagram under the lid the spare fuses will be shown as an empty box and the spare relays are numbered.  When you check the list though they are noted as spares (see Image 3).

Repairing Jeep Fuse Problems

The first thing to try if you have an electrical problem is to reseat the appropriate fuse.  If you’re not sure which fuse it is, just reseat them all.  It is not uncommon for a fuse to work it’s way loose while off-roading.  Just push down on the fuse with your finger.  For the ones that are a tight fit, the eraser end of a pencil works well.

If a fuse has blown you can use that yellow thingie to pull it out and then insert a new one.  You do have a spare right?  Image 6 shows what a good fuse and a blown fuse look like.  A fuse can look good though and still be blown.  The only definitive test is using a multimeter.

I hate to have to mention this, but I see it happen so often.  Do not replace a 10 amp fuse with a 20 amp fuse.  That 10 amp rating on the fuse is not a suggestion, it’s a requirement.  Putting in overrated fuses risks starting a bonfire, and instead of marshmallows, you’ll be roasting your Jeep.

If you have a new Jeep and have not done so, you should reseat all of the fuses and relays.  It appears the guy on the line that installs them has carpal tunnel syndrome and can’t push them down all the way.  On my new Jeep five of the relays were not fully seated and at least 70% of the fuses.

Jeep Spare Fuses

Don’t rely on what Jeep provided since not all fuse varieties are included.  You need more than one of each value anyways since it is not uncommon to go through several fuses while troubleshooting a problem.  At the moment I can’t find any fuse kits for the JL to recommend so you’ll have to put together your own.  It should include the following.

  • Micro fuses: 5, 10, 15, 20, and 25amp
  • Cartridge fuses: 20, 30 and 40amp.

Don’t forget fuses for any modifications you’ve added to your jeep.  Modifications such as an onboard air compressor, winch or additional lighting will typically have their own fuses.

Jeep Fuse Array

Let’s talk about the fuse array I mentioned earlier.  Under each of those bolts in Image 3 is a high amp fuse that is part of the PDC (power distribution center).  The fuses and the metal plate are a solid one-piece assembly (Image 7).  If one fuse fails you have to replace the entire assembly (I think the same guy that installs the fuses came up with that brilliant design).  The Mopar part number is 68368853AA and it costs approximately $60.

I have heard of several instances where Jeep mechanics did not know the fuse array could be replaced and instead replaced the entire PDC at a cost of $600 plus.

You can find a fuse box quick reference guide at the JLWrangler forum.