If you are tripping a circuit breaker the breaker may be week and need replacing. Look at the circuit breaker and see what rating it is and as a quick test put a fuse o that rating in place of the breaker. If the fuse blows you have an overload most likely from a short in one of the second or third lights.
If the fuse holds replace the breaker.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles