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Its n the Dana service manual, 5 solids indicates an internal fault… the units are potted in a most nasty fashion. I have not heard of anyone recovering one with 5 solids…

I did 2 videos, this link is to The latest version, watch both of them. Tgere is a link in the description of the first vid to the first wiring diagram. I have not done a diagram for my latest version(added a latching circuit to the control relay). The system is not particularly complicated...

5 solids? Internal fault, it’s now an interesting coffee table conversation starter, as it is a little bulky to try and skip across a lake… Mine was that way when I got my truck, prime motivator for my going manual…

I would think it is supposed to accurately reflect switch state, so either the controller is mis-reading the switch circuit or there is a problem with the switch circuit causing it. I would ring out that circuit really well. An ohm meter will tell you if you have a good circuit by jumpering...

but it continues to short cycle with the switch unplugged? Either the switch sense circuit is not working(bad controller) or perhaps there is a low resistance path in the wiring back to the switch… The tester gives you switch state to see if it is cycling properly with manual operation and...

Thats weird. Just to clarify, pressure switch(wet tank) or pressure sensor(on PCU)? If the switch circuit was shorted somewhere along the path from controller connector to wet tank. That would lie to the controller and it would allow it to try and function. The wet tank switch tells the...

What do the primary and secondary brake gauges read when the dryer purges? It should be 125PSI, and the wet tank switch should close above 117… you should be able to measure this closure between two of the 3 pins on the pressure switch connector. Two of those codes you listed indicate a bad...