Just for fun, I plugged them into my '64 Impala's 4-light system. They work beautifully and without having to swap wires around. So there's something goofy in the motorhome wiring. The lights have always been really dim, even for old halogens. Not sure if that's related.
Oh Yeah..its part of the problem
set the LED lamps aside for now
find and fix the wiring problem
loose bad ground ?
headlights in series instead of parallel ? only 6v per lamp
screwed up headlight relay/wiring see above
make all that correct
then install the new LED headlights
