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ab or aa mine was doing the same thing had aa filter changed to ab filter have driven empty 200 miles and gauge only just went to 1/8 aa is white with glue strips ab is orange no glue strips
had the aa filter was doing regen every 100 miles changed to the ab filter drove 200 miles and gauge only at 1/8 runs a lot better also. 2022 ho 3500 dually 20000 miles
just went and looked gray is for aux switchs pass through harness. Didn't see the blue connector. on the older trucks the blue was for aftermarket trailer brake controler. have 2022 3500