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Discussion in 'Electrical Systems' started by QUAKE_WARS, Aug 8, 2019.
The fuse will pop before it gets too hot.
Not always the case-a slow, parasitic voltage loss and amperage gain can increase the amount of heat until it melts. Once the thermal runaway process starts, that fuse may not pop because the current isnt reaching (ie being used) the headlights because of the switch. To a lesser extent that is also the reason why fusible links protect better than just a fuse on individual circuit runs.
My setup had separate relays with hot and ground splitting in parallel to the relays.
Mine has 2 relays, 1 for each light.
If done correctly the headlight switch on the dash will only be see the 12v from the fuse box. The headlight switch is being used to turn the relay on. The relay is what should only be drawing current from the battery.