Ford Truck Enthusiasts Forums - View Single Post - What Just Happened? Blew A Fuse..But Why?
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Old 06-04-2014, 01:38 PM
retiredsparky retiredsparky is online now
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This thread is a very good lesson for all of us. Repeatedly replacing a fuse because of needing to get back on the road or in a dangerous/inconvenient location can cause further damage to other wires bundled with the shorted wire. Over-sized fuses are never a good idea. The fuses are sized to protect the wire, which is sized to handle a certain amount of current flow without overheating. A shorted wire increases the current flow to ground, causing heat. As the current goes up, the heat produced goes up by the square of the increase in current. So 3X current produces 9X heat, quickly damaging fuse blocks, other wiring. If labor is factored in, very costly! Good job finding the problem, bigshoe. Larry
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