A 73 was the first year for an alternator and had an external regulator. 74 went to an internaly regulated alternator. If you have an internal reg. car you should just have to match up the 3 wires. If you had an external regulator the 3 fat wires will be disconected from the regulator and spliced together and the small wire from the idiot light will splice to the smaller B+ wire to the alternator and the ground is still ground.
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NO_H2O
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