Alright I though about more about my answer to voltage drop. The big thing about added more load (ie higher watt lamps in front head light) to electrical system the worst it get. The cables might get over heated or melt the insulation.
The way company get around this by adding a relay. This ok on the standar load. When you add more load you may need to increase your cable size to deal with the larger load. So adding another relay is not the right answer. It to increase the size of your cables going from your load to your battery.
Company have a good size conductor going to most load in a car. There would be safety marging when dealing with head lights, so you increase your lamp size to a certain size. But if you want to go bigger you might want to think about your cables
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