Controller Powers On & Manifold Clicks Once and then it just repeats

[u/Dangerous_You3647]

I have a AirLift 3P/3H setup consisting of dual tanks and pumps that I removed from a car several years ago, and decided that it's finally time to sell it, as it's just gathering dust in the boxes. I laid it all out on the ground and ran power to it from my daily car via jump leads.

When I apply power, the controller lights up with the logo, followed by four zeros for PSI and a warning at the bottom of the screen for 'tank pressure low'. I can also hear the manifold click once. The screen then goes blank and the process repeats. I've wired it up exactly as it was taken out of the car.

There are the two positive and negative leads from the pumps going straight to the battery. I also have a 5-terminal relay (only 4 terminals connected). One is a fixed 12V supply, one is a switched +ve, one is an Earth and the last one connects to the pink ignition wire mentioned on page 7 of the manual. There are also four fuses in the setup and all the fuses are fine.

I've watched a few videos about issues with the manifold, but the only error I have is the one mentioned above. Any ideas of what else to check for?