OK, so I ended up with an ARB 24v dual compressor. It's a nice piece. I'm going to run it off my 24v lithium pack.
But... I am not impressed with the control harness. It's a bad hack to make a 12v harness and fan system work in a 24v system.
The harness includes wiring for three switches (compressor, 2x lockers) which is nice.
However, the harness is built to use 12 volt power to control the 24v system.
In the case of the built in relays on the compressor stack, it's not good.
ARB decided to include a small "ground" lead that you're to hook up to the - terminal of the upper 12v battery.
What's bad here is that this line is treated as a ground, but it's +12v, hot through the entire harness.
It feeds up to the switches and is used to provide ground signal to the relays and fan, providing the effective 12v.
This isn't the end of the world, but this lead should absolutely be fused if you're running it this way. Without a fuse, it's dangerous.
Add a 3-5 amp fuse inline, and you'll be back to the land of safely wired gear.
But... I am not impressed with the control harness. It's a bad hack to make a 12v harness and fan system work in a 24v system.
The harness includes wiring for three switches (compressor, 2x lockers) which is nice.
However, the harness is built to use 12 volt power to control the 24v system.
In the case of the built in relays on the compressor stack, it's not good.
ARB decided to include a small "ground" lead that you're to hook up to the - terminal of the upper 12v battery.
What's bad here is that this line is treated as a ground, but it's +12v, hot through the entire harness.
It feeds up to the switches and is used to provide ground signal to the relays and fan, providing the effective 12v.
This isn't the end of the world, but this lead should absolutely be fused if you're running it this way. Without a fuse, it's dangerous.
Add a 3-5 amp fuse inline, and you'll be back to the land of safely wired gear.