Sorry I can't provide the answer , but I'm sure a National owner will be along shortly.
Strange there is no dash switch,  Newmar has the dash switch and then the docking lights come on with the back up lights.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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