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I think you need a resistor. The normal route is... ignition, though the charging "dummy light", or if that's blown there's a resistor on the back of the cluster, to the alternator (which is acting as ground). therefore allowing the light to light up. Once the alt. starts to charge it changes the ground to pos. (I have no idea how) and the light goes out because it's not grounded anymore. Now if you have a jumper wire without any resistance in there it's essentially a short circuit that blows fuses.
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