the other reason why Im saying this about those switches is...I did the same thing you are doing on my other car...my switches also are heavy duty copper contacts...I went back to the switch as the car was running,and that switch was so hot it felt like it was going to go into meltdown...I went and switched over like I did in the race car and it doesnt have nearly the heat build up...

Im just saying those smaller contacts/terminals have a much lower rated load capacity...and be careful...