[Fulltiming]

I believe the role of the auxiliary contacts is to prevent both sets of primary contactors from being engaged at the same time. I had debris holding open one of my aux. contactors and I could use shore power but got nothing on generator power. Cleaned out the debris so the contactor could close and generator power was operational again. My aux. contactors are clear so once I pulled them, I saw the junk inside one of them keeping it from closing.