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12-14-2011, 09:56 AM | #23 |
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So did you put a fuse on the +12v lead yet?
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12-15-2011, 07:47 AM | #24 |
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It is NOT dead wrong.
A fuse is nothing but a pass-through link (in these applications). There is NOTHING in it that reacts to polarity. Think about this: did you ever blow a fuse because it was inserted in the wrong direction? No! That's because there is no direction - no polarity. Now ... reversing a circuit's polarity can cause a spike in current in some instances, when a polarity-sensitive device burns out and results in a short to ground. The high current can then blow a fuse. See kouhii's post as an example. That's because the short circuit creates a huge current draw: the reduced resistance results in a much higher current, which blows the meltable element in the fuse. The polarity stays the same. |
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