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Forgive me for not following up, I lost track of this post, but am very grateful for the help - it was very useful to help me understand the system. Fortunately I identified loose wiring as the cause...firmed up the connections and it started working - found the fault by accident when preparing...
Unit won't flush, suspect a clog or duck bill valves...no blown fuses. I have a vacuum holding tank (VHT) unit in the engine compartment that has what looks like a pump on top of it. However from what I've read there's supposed to be a vacuum pressure tank and associated tank between it and...
