Denny Graham,

How so! If the total load on the load side of the thermal is more than the rating of the thermal...which light is the culprit?

Pulling on the headlight might be innocent if the dash lights are pulling tons of current..or the taillights are going nuts. It merely means the headlight put the draw over the top and tripped the overload. It doesn't mean it's the headlights that are the cause.

Is this thinking defective!

Stuart