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Not the fuse, the relay was bad -- probably from being overheated with the high amp fuses.Fuse size should not affect how bright a light is other than blowing if it is too small to handle the load. All it does is pass current through to the load which is the lights. It could care less if it was a 100 amp or a 15 amp fuse. Just that if it was a 15 amp fuse and the circuit was drawing 20 amps it will blow.