JL/JT ARB Brushless Twin Compressor Bracket Part Number GOR10820

Verify that all parts shown in the picture are present.

If using the ARB CKBLTA12 Brushless Twin Compressor, ring terminals are provided by ARB to connect the ARB Brushless Twin Compressor to the vehicle's battery.

If using the ARB CKMTA12 Twin Compressor, three 6 gauge M8 stud size ring terminals are required to connect the ARB Twin Compressor to the vehicle's battery.

Remove the hardware securing the inner fender liner with a 10mm socket. One of these may be a push pin on some models.

Start at one end of the fender flare and pull out, away from the vehicle (pull hard!) to remove the fender flare.

Disconnect the side marker light wire harness by first pulling the red tab out, then separating the connectors.

There are ten retaining clips on the backside of the flare. These clips may be damaged during disassembly. Replacement clips are available, Mopar part number 68526185AA.

This step pertains to the 3.6L Pentastar engine only. Skip to Step 4 if you have the 2.0L Turbo engine.

Remove the two nuts holding the wheel sensor plug bracket to the firewall with a 10mm socket or wrench. Save the nuts as they will be used later.

Pull the wire harness retainer off the stud.

Use a flat blade screwdriver to separate the bracket from the plug.

Discard the wheel sensor plug mounting bracket

Relocate the wire harness retainer to the stud below the silver heat shielding.

Install the Grimm OffRoad Spacer Plate on the mounting bracket studs as shown.

This step pertains to the 2.0L Turbo engine only. Skip to Step 5 if you already completed Step 3.

On the firewall, disconnect the wheel sensor and O2 sensor plugs.

Remove the two nuts holding the plug bracket with a 10mm socket or wrench. Save the nuts, as they will be used later. Discard the plug mounting bracket.

Cut the zip-tie holding the wire harness to the stud directly under the brake booster. Pull the wire harness retainer off the stud and discard.

Trim the plastic clip that holds that coolant line against the firewall. This clip will interfere with the compressor's heat shield if not removed.

Use a new zip tie to secure the two wire harnesses to the coolant line as shown.

Install the Grimm OffRoad Spacer Plate on the mounting bracket studs as shown.

The following steps are for the ARB CKBLTA12 Brushless Twin Compressor. If you are installing the ARB CKMTA12 Twin Compressor, skip to Step 8.

Follow the ARB Brushless Twin Compressor (CKBLTA12) instructions to get the compressor setup for use. This involves adjusting the clamping mechanism, removing the plastic dust plugs from the ports, and installing the pressure switch.

With the compressor oriented as shown with the compressor mounting holes facing up, the ARB mounting bracket should be positioned with the cam-clamp on the left. Orient the Grimm OffRoad Compressor Bracket and heat shield into the Compressor as shown.

Remove the compressor from the ARB mounting bracket by loosening the cam-clamp on the side of the compressor.

Secure the Grimm OffRoad compressor bracket and heat shield to the ARB mounting bracket.

Use 2 of the ARB provided screws, washers, and Grimm OffRoad provided M6 nylock flange nuts to secure the end of the compressor bracket with the heat shield to the ARB mounting bracket.

The other end of the Grimm OffRoad compressor bracket has PEM nuts installed and needs just 2 of the ARB provided screws and washers to secure the ARB mounting bracket to it.

Torque mounting hardware to 5 lb-ft [6 Nm].

Install the two 1/4” NPT x 1/2” barb 90° fittings into the inlet ports on the ARB Twin Compressor. Use thread sealant on the NPT threads and clock the barb fittings as shown in the picture.

Note that NPT fittings are tapered fittings and must not be overtightened. If you can't get the fittings to point the correct direction, it is recommended to remove, use a couple additional wraps of Teflon tape, then reinstall.

Install one of the grey 1/4” NPT x 3/8" straight barbed fittings into the outlet port of the ARB compressor. Make sure to use thread sealant on the NPT thread.

Remove the lower master cylinder nut with a 13mm socket or wrench and install the mounting bracket assembly onto the lower MC stud and the two firewall studs with the previously installed Grimm OffRoad spacer.

Wrangler and Gladiator models will use different mounting bracket holes for the lower MC stud. The extra bolt holes provided in the top of the compressor bracket allow mounting of an ARB Manifold (Part # ARB171503), allowing the connection of multiple air lockers to a single compressor. Additional wiring is required.

Reinstall the OE nuts onto the firewall studs to secure the bottom of the Grimm OffRoad compressor mounting bracket.

Torque with a 10mm wrench to 8 lb-ft [11 Nm].

Reinstall the lower master cylinder nut.

Torque with a 13mm wrench to 13 lb-ft [18 Nm].

Install the ARB CKBLTA12 Brushless Twin Compressor and tighten in place with the cam-clamp.

Skip to step 11.

The following steps are for the ARB CKMTA12 Twin Compressor. If you already installed the ARB CKBLTA12 Brushless Twin Compressor, skip to Step 11.

With the mounting holes of the ARB Twin compressor facing up, set the Grimm OffRoad Compressor Bracket onto the Compressor, sliding the wiring harness though the large hole in the bracket as shown.

Position the Grimm OffRoad Heat Shield on to the right hand side of the compressor and use the four ARB screws and washers that came with the compressor to secure the compressor to the bracket.

Torque mounting hardware to 5 lb-ft [6 Nm].

Install the two 1/4” NPT x 1/2” barb 90° fittings into the inlet ports on the ARB Twin Compressor. Use thread sealant on the NPT threads and clock the barb fittings as shown in the picture.

Install the 1/4F NPTF X 1/4 Male NPTF 90° elbow fitting into the outlet post of the ARB compressor. Make sure to use thread sealant on the NPT thread and orient the fitting as shown.

Install one of the grey 1/4” NPT x 3/8" straight barbed fittings into the elbow fitting. Make sure to use thread sealant on the NPT thread.

Note that NPT fittings are tapered fittings and must not be overtightened. If you can't get the fittings to point the correct direction, it is recommended to remove, use a couple additional wraps of Teflon tape, then reinstall.

Install the compressor assembly onto the lower MC stud and the two firewall studs with the previously installed Grimm OffRoad spacer.

Wrangler and Gladiator models will use different mounting bracket holes for the lower MC stud.

The extra bolt holes provided in the top of the compressor bracket allow mounting of an ARB Manifold (Part # ARB171503), allowing the connection of multiple air lockers to a single compressor. Additional wiring is required.

Reinstall the OE nuts onto the firewall studs to secure the bottom of the Grimm OffRoad compressor mounting bracket. There is not much clearance, you will need to pull the compressor bracket away from the firewall about 1/4” to get the nuts on. Tighten with 10mm wrench.

Torque to 8 lb-ft [11 Nm].

Reinstall the lower master cylinder nut.

Torque to 13 lb-ft [18 Nm].

Skip to Step 14.

The following steps are for the ARB CKBLTA12 Brushless Twin Compressor. If you are installing the ARB CKMTA12 Twin Compressor, skip to Step 14.

The ARB CKBLTA12 Twin Compressor comes with two wire harnesses and a power lead. The thicker harness is the main power harness and will be used to power the compressor. The other harness is the control harness and will be replaced by the included Grimm OffRoad control harness.

It will be necessary to detach the compressor from the ARB compressor mount to attach the wiring and air hose.

Plug the ARB power harness into the matching plugs on the ARB compressor, including the pressure regulator, route the wire up over the brake booster and along the firewall to the battery. Connecting the power terminals will be covered later.

The air hose can also be connected to the compressor at this time. Slide the air fitting threaded cover onto the hose, push the hose onto the barbed air fitting already installed on the compressor, and then tighten the cover by hand.

The ARB compressor can be reattached to its mounting bracket now.

Locate the Grimm OffRoad short control harness, ground lead, and power lead as shown.

On the ARB power harness coming from the compressor, there should be a white connector housing in a bag attached to some male spade terminals. We are going to use only the red spade terminal from the ARB power harness and connect it to the provided white connector housing as shown.

Connect the Grimm OffRoad black ground lead spade terminal and red power lead spade terminal to the white connector housing as shown.

The spade terminals just press in until they click.

Connect the white connector housing with inserted spade terminals to the Grimm OffRoad provided Control Harness.

The ARB red spade terminal should match up with the purple wire in the control harness, and the Grimm OffRoad spade terminals should match up with their corresponding red and black wires in the Grimm OffRoad control harness.

Route the black ground wire from the ARB power harness so it reaches the nut shown with plenty of slack. Strip and crimp the ARB provided ring terminal to the wire and secure with the nut.

Skip to Step 15.

This step is for the ARB CKMTA12 Twin Compressor. If you are installing the ARB CKBLTA12 Brushless Twin Compressor, skip to Step 15.

The ARB CKMTA12 Twin Compressor comes with two wire harnesses. The thicker harness with the fuse blocks is the main power harness and will be used to power the compressor. The other harness is the control harness and is replaced by the included Grimm OffRoad control harness.

Plug the supplied Grimm OffRoad long control harness into the smaller of the two ARB Air Compressor plugs.

Plug the ARB power harness into the matching plug on the ARB compressor, route the wire up over the brake booster, along the firewall to the battery. Use zip ties to anchor the wire harness along the firewall. Connecting the power terminals will be covered later.

The air hose can also be connected to the compressor at this time. Slide the air fitting threaded cover onto the hose, push the hose onto the barbed air fitting already installed on the compressor, and then tighten the cover by hand.

Install the supplied filter relocation hoses onto the barb fittings on the compressor. The longer of the two hoses connect to the innermost fitting, the shorter connects to the outer fitting.

These lines simply press-on and do not need any additional clamps.

Route the air hoses up between the brake booster and the inner fender structure.

Install the ARB Compressor Filters on to the leg of the Grimm OffRoad control panel as shown.

Thread the two 1/4” NPT x female barb fittings onto the ARB filter nipples and tighten by hand. Match the alignment of the barbed fittings as shown in picture above.

The ARB filter housing is plastic; the threads can strip out easily. DO NOT OVER-TIGHTEN!

Install the grey 1/4” NPT x 3/8" straight barbed fitting into the back of the bulkhead fitting on the control panel. Use thread sealant on the NPT threads.

This step pertains to the 3.6L Pentastar engine only. Skip to Step 18 if you have the 2.0L Turbo engine.

Remove the fender bolt shown with a 10mm wrench/socket.

Place the provided 5/16" flat washer over the hole to the right of the fender bolt removed.

Remove the push clip holding the black lines to the silver bracket tab and secure below the tab with one of the provided zip ties.

Push air filter relocation hoses from the compressor onto the barb fittings on the back side of the air filters.

The air hose can also be connected to the compressor at this time. Slide the air fitting threaded cover onto the hose, push the hose onto the barbed air fitting already installed on the brass bulkhead fitting, and then tighten the cover by hand.

Install the Grimm OffRoad Control Panel using two of the provided M6 bolts and washers and the previously removed OEM fender bolt.

Use a 10mm socket/wrench to torque hardware to 7 lb-ft [9 Nm].

This step pertains to the 2.0L Turbo engine only. Skip to Step 19 if you already completed Step 17.

The 2.0L Turbo engine has a mini fuse/relay box that needs to be relocated to make room for the Grimm OffRoad Control Panel.

Remove the painted fender bolt and both bolts securing the fuse/relay box with a 10mm wrench/socket.

Relocate the fuse/relay box up above the brake booster and secure with the existing flanged nut and the M6 x 1.0 included flange nut.

Use a 10mm socket/wrench to torque hardware to 7 lb-ft [9 Nm].

The fuse/relay box mounting bracket may need to be bent down slightly to prevent any interference with the hood when closed.

Jump back to Step 17 and finish mounting the Grimm OffRoad Control Panel.

Be absolutely sure that you hook up this switch correctly according to the diagram in the first image. If wired incorrectly, you can short power directly to ground and damage the wiring in the compressor itself (CKMTA12 only). ARB will not warranty your compressor if this happens.

The Grimm OffRoad control harness for the CKMTA12 now has a fuse in it that will need to be replaced if the switch is wired incorrectly, but it will save the compressor from being damaged.

Route the Grimm OffRoad Control Harness through the switch hole in the control plate.

Plug the wires into the back of the ARB compressor switch. The BLACK wire goes to the top terminal, the RED wire goes to the center terminal and the PURPLE wire goes to the lower terminal.

The spade connectors can be very tight. It helps to use pliers to help push them on, or use a small flat blade screwdriver to slightly open them up to ease installation.

To install the switch, push the switch into the control plate until it snaps into place.

Install a 1/4" NPT male air coupling of preference (not included, we recommend Grimm OffRoad Air Hose Kit GOR10743 which includes an NPT air coupling). Make sure to use thread sealant on the NPT threads.

The following steps are for the ARB Brushless Twin Compressor (CKBLTA12). If you are installing the Standard Twin Compressor (CKMTA12), skip to Step 24.

Route the Grimm OffRoad provided black ground lead along the firewall and over to the fuse panel from where it was connected earlier to the switch harness.

Connect the ground lead to this stud as shown next to the fuse box.

The fuse tap is used to grab ignition-on power from the vehicle so the compressor can only be ran while the vehicle is running.

Remove the fuse box cover and locate the F58 fuse. Use the fuse puller to remove the yellow 20A fuse from this location.

Reinsert the yellow 20A fuse into the bottom location on the fuse tap and place the provided red 10A fuse into the top location.

Insert the fuse tap into the F58 location the yellow 20A fuse was removed from.

If there is any difficulty installing the fuse tap, ensure there is no leftover flashing on the sides of the plastic housing from the molding process. If there is, it can be carefully removed with a utility knife.

Attach the ARB provided fused lead to the positive battery terminal as shown.

The two red wires from the ARB power harness will attach directly to the fuses in the fused lead. Trim the wires to length, strip, and crimp an ARB provided ring terminal on each wire. Connect each of these wires to the fused lead.

Route the fuse tap out of the fuse box as shown.

To provide an outlet for the fuse tap wire, a small slot needs to be cut into the fuse box cover as shown for the fuse tap wire to pass through.

Replace the fuse box cover, taking care not to pinch the wire, and use zip ties to anchor the wires along the firewall.

Skip to Step 25.

This Step is for the ARB Standard Twin Compressor (CKMTA12). If you are installing the ARB Brushless Twin Compressor (CKBLTA12), skip to Step 25.

Connect the ARB compressor harness power leads directly to the battery according to the ARB Twin Compressor Installation Guide.

Three 6 gauge M8 stud size ring terminals are needed to connect the ARB Twin Compressor Harness to the battery terminal ends. M8 ring terminal ends are required and do not come with the ARB compressor harness.

Start the vehicle and toggle the compressor switch to the on position. The compressor should turn on for a short period of time then turn off. If it doesn't, spraying the air connections with soapy water can help identify any leaks.

The fan on the ARB Twin Compressor will continue to run until the switch is turned off.

Re-install fender flare, replacing any retaining clips broken during removal.

Reconnect the side marker light wire harness connector and push the red locking tab in.

Re-install the five screws using a 10mm socket/wrench and press the push pin back into place.

Torque hardware to 7 lb-ft [9 Nm].