ARB Compressors and AUX Switches

2Wheel-Lee

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Like 2Wheel-Lee said, and I'll add that you don't need the air tank to run lockers either (just the manifold and solenoid kit). It's really only for that instant boost that's needed for air tools or powering an air horn.
If you're only running ARB lockers, I'd probably prefer not to run a tank, just in case there is a very slight leak in the system. Without the tank, the compressor would almost instantly fire the lockers, in the event the tank isn't pressurized. Although on the other hand, if all is sealed, and your tank is pressurized, you'd almost never have to run the compressor during a day of wheeling turning lockers on and off. My Samurai has ARB lockers and no tank, and I love that I can pressurize the locker solenoids almost instantly.

I only installed a tank in my JL for using an air hose to blow dust out of the interior.
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DrJoeSchmoe

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If you're only running ARB lockers, I'd probably prefer not to run a tank, just in case there is a very slight leak in the system. Without the tank, the compressor would almost instantly fire the lockers, in the event the tank isn't pressurized. Although on the other hand, if all is sealed, and your tank is pressurized, you'd almost never have to run the compressor during a day of wheeling turning lockers on and off. My Samurai has ARB lockers and no tank, and I love that I can pressurize the locker solenoids almost instantly.

I only installed a tank in my JL for using an air hose to blow dust out of the interior.
The tank would continuously be pressurized by the compressor unless it was turned off. I have a very small leak in my system, and the air compressor kicks on every hour or so to top it off. I guess it all depends on your needs. The tank is simply reserved air pressure, ready when you need a prolonged boost. You can still blow dust out with the power of the compressor and no tank.

Where did you mount the air tank?
 

MCJA

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You can't connect them directly to any of the Aux switches - as you said, they draw too much amperage. They come with their own 40 amp fuses (1 for each compressor), and you can connect the control wire directly to your OEM Auxiliary switches. No need to install your own relays - the ARB dual compressor kit comes with it already installed.

I did a write-up on my dual ARB compressors and 4-tire system here.

A few pictures of my installation:

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RockyMtnHigh

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FYI: the power wires on the twin arb are 10awg. Others have done the aux thing. Run the power and ground wires to the battery and the purple from the arb to your aux hot.
But what about the small black wire bundled with the purple? Everyone says purple to Aux, which I get, but I haven't found anything on that black wire
 

MCJA

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But what about the small black wire bundled with the purple? Everyone says purple to Aux, which I get, but I haven't found anything on that black wire
The black wire on the wiring harness isn't needed if you're not using ARB's switch kit. (The switches are lit, so they need a ground.) The black wire is a pass-through ground for the ARB switches themselves. In other words, rather than having to connect the ARB switches to a ground stud separately, ARB made it super easy - you just plug their switch wiring harness into the compressor wiring harness, and the switches use the compressor's common ground wire.

The instructions for the ARB compressor come with a wiring diagram. You can "chase" the ground wires. If you do, you'll find that the black wire isn't needed.

Hope that helps!
 

SilverSurfer

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The black wire on the wiring harness isn't needed if you're not using ARB's switch kit. (The switches are lit, so they need a ground.) The black wire is a pass-through ground for the ARB switches themselves. In other words, rather than having to connect the ARB switches to a ground stud separately, ARB made it super easy - you just plug their switch wiring harness into the compressor wiring harness, and the switches use the compressor's common ground wire.

The instructions for the ARB compressor come with a wiring diagram. You can "chase" the ground wires. If you do, you'll find that the black wire isn't needed.

Hope that helps!
Thank you. I was struggling to figure out what to do with the black wire :)

I was going to just earth it but as mentioned you only need to connect the purple wire to the Aux power wire.
 

donmontalvo

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Thank you. I was struggling to figure out what to do with the black wire :)

I was going to just earth it but as mentioned you only need to connect the purple wire to the Aux power wire.
I'm running an ARB Dual Compressor under the passenger seat in my 2021 JLUR. I wasn't sure what the thin black ground wire was for so I connected it to the main ground wire. I'm using ARB's under seat mount kit, which comes with a switch.

The blue light on the switch is always on, whether I have the switch toggled on or off. I wonder if I should cut the small black ground so the blue switch light is off unless the switch is toggled on?

FWIW, I ran the two black 10 gauge/AWG wires to the battery ground ("-"), and I ran the two 10 gauge/AWG red wires to the battery positive ("+"). Mostly because that's what ARB advises, but even if they didn't, the AUX switches weren't designed for that much power.

EDIT: I'm running a MORRflate hose solution, so I can air up/down all four tires at the same time. Since the ARB under seat coupler is by the door, I run a 7.5' extension (choose ARB from the menu) so the gauge and all hoses come through the two front windows.
 
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