The unit we have simply has led lights. Two of the lights stay on while they check the circuit. If it checks out there is a click and a green light comes on. There is a red led that is suppose to come on if there is a serious problem with the connection, and it appears this light is not on.
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DPAM
2017 GMC Denali diesel, crewcab, 4x4, regular box.
2010 Montana 3150RL- Moving to Montana Package , Hickory Edition Package, wet bolts
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