1. Disconnect battery.
2. Remove the wires attached.
3. Remove the alternator (two bolts the top one is a 13mm and the bottom one is a 6mmhex).
4. put in new alternator in the opposite order.
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One of the functions of the alternator regulator is to compare the alternator output with the battery voltage. If there is a problem it puts the light on. Either the battery is overcharging or...