Electric problem with my Century Buick

Hello people, good night I am here to request help or some tips Useful my Century Buick is heating the lighting swing of lights and reviewed the wiring and everything is fine, I think that it will be a bad earth or the bad connectors that you think.

Hi Cesar.A:
1.-could be a short circuit to intermittently, but it would merge fuse. 2.- Ampoules com greater power than the factory. 3.- Lack of land I do not believe, because you would have weak lights. 4.- Light switch is reaching its useful life, expired and/or reheated contacts. 5.- I suggest you install some relays for the largest and low light bulbs at the arrival of each focus. If you tell me what type of spotlights and how many 2 or 4 use your car, if they are sealed headlights or H4 type blister, I can send you a diagram with the installation of some relays on both sides and the suichera will not reheat again and the lights will improve its power.