There have been numerous threads in the past concerning poor/dim headlights. I wanted to share my solution.
In the past, people have blamed cheap headlight units from china, clouded lenses and inadequate wiring.
I replied to a thread back in December 2013 saying I had purchased a headlamp relay kit from Daniel Stern Lighting Consultancy and Supply
I installed it a couple of weeks later but haven't had the opportunity to test it as I don't normally travel in the dark.
Well, this morning, I had to take the coach for her annual oil change and although I live half a mile from the local Camping World, I just couldn't bring myself to go there so booked it in to a truck service place about 30 miles away. This meant leaving at 6am in the dark.
WOW! what a difference
Before, it was difficult to even tell the lights were on and main beam didn't improve it much. Now, I can see the road ahead and main beam illuminates half a mile or more ahead.
What their kit does is by-pass the inadequate (40ft) wiring and the headlight switch. In addition, when main beam is active, it keeps the low beam on as well.
In my case, I connected the power feed to a large half-inch 12-volt terminal in the front compartment.
As an aside, last year I also replaced the headlight switch to fix the dash lighting. That MAY have been contributing to the previous problem (no way to be sure).
I am VERY pleased with the results