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Jimmy, I don't recall if a '74 had an external voltage regulator or not. I'm thinking it did, tho, so that's the first thing to check. If you don't have a volt meter that will read DC (direct current) voltage, you will need to take your truck in to have this checked out. Best of luck to you.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them