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Hi there, my 99 DPDP is in storage so I can't be sure on this, I do know that my air horn pressure line runs up the drivers side windshield pillar. If the line your trying to trace runs under the chassis, and it looks new to the coach, it may be a feed for air operated ,towed vehicle brakes. Although that would be a strange place to hook it in as the info I read on those systems say they tap into the air at the rear brakes on the coach. Look for an air connector near the trailer plug at the rear of coach.
I also found that trying to follow anything in the front of the chassis is much easier when you pull the gen-set forward and lock it in place then go up into the cavity behind it. This gives you access to the air tanks also.
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