Does your RV have a DRL (Daytime Running Light Module)? DRL modules power the headlamps to achieve 50% brightness. This could be the reduced voltage that you're measuring. When I upgraded to xenon HID's I had to eliminate the DRL. The ballast that power the xenon's isn't compatible with DRL's.
David Brady
'02 Blue Bird, Wanderlodge, LXi
NC
|