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Hi. I actually bought my 1990 Prevost 10 years ago to take my wife on a cruise around the country. Right after I bought it she got cancer and passed away. It has been sitting in my yard ever since. Recently I decided to play with it. I can’t get it to raise and lower. I replaced the 4 valves with the red tips. Made no difference. Then I replaced the up/down switch on the level/low. No difference. Then I ordered the rotary switch on the level low. I got it but it wires up completely differently. I have no idea what color wire hooks up which terminal on the new switch. My auxiliary compressor barely makes 50 lbs of pressure. HELP i know absolutely nothing about busses or the whole air suspension system. I’ve been reading posts and trying what they suggest. A good note is I actually got the bus running again after all these years. I’ve learned a lot. Thanks everyone