I have two 50 amp fuses that bring power from the main shutoff to my garage. When I flip the breaker in the garage all my readings seem to be normal. As I begin to turn just the lights on after I get just 3 or 4 (60 watt simple everyday led light bulbs) turned on the lights begin to dim. (The breaker box has 8 25 amp breakers in it and uses all 8 breakers for the outlets and the lights). If I have only one light on and I attempt to plug in anything into an outlet the single light I have on will lose over half of its brightness.
No matter which light I have on the above problem seems to occur. Why would it do that?