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It tricks the loader into thinking it's in Suspension mode (its most stable height 4.5") allowing you to raise the Deck without being in suspension height or travel height 9.5. This is used mainly for reconfiguration of the loader for transport, or it's a time saver. I don't have to stop, lower suspension, and then raise the deck. I just hold the switch and raise the deck.
yes
If it's a swingarm-type model use longer shocks, if it's a Softail use shorter shocks. Or you can use height-adjustable air shocks on any Harley with a rear suspension.
yes all you need is to raise the suspension
air suspension may need checking
to Raise a car you need to modify the suspension by getting larger springs, body mount lift blocks and adjusting the alignment once it is raised
The screws that hold the tail light in place are accessible only after you raise the hatchback or lower the tailgate. the screws are usually TORX drive
There's a suspension valve towards the rear of the frame... there's a little room to tilt it so that you can raise or lower the air suspension. Just loosen the nuts on the back of it, tilt it, tighten it down when it's where you want it to be.
Yes, all it takes is $$$$.
Check for leaks on the air lines. Or holes in air bags
An independent suspension system
Probably one or both of the front air shocks or the compressor.