My vintage Newmar ( like a 57 Chevy ) requires the headlight dash dimmer be turned all the way to the highest setting in order for the map light to come on ( and the switch on the lamp on too.
If the headlight switch looks like this one ( mid 70s GMC truck ) chances are the control is the same .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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