04-11-12, 11:38 PM
just to put my 2p in, excess heat heat in a wire is a sign of too much current being drawn through it. Since the voltage and resistance of the wire/alternator is fixed (within a small range depending on engine revs and heat etc) it's only current that can change dramatically. This is usually caused by something drawing too much, like a faulty bulb or short-circuit. The common mistake is to think that the alternator/battery produced too much power/current but its the other way round, the bulb draws the current it wants and the alternator/battery tries to provide it. So my point is that you probably have a short circuit between the fuse and the headlight or a faulty bulb that is drawing too much current and then melting the fuse. I've probably rambled on enough though... :rollin
overheating = too much current
overheating = too much current