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Is he using the same battery for both trucks? I would say to get a new battery. I just had a starting problem with my 78. Same as you say one good crank than the dreaded clicking. Took battery to autozone for there free check. They said it was good. Had them check the alternator next and it was bad according to there check on it. One new alternator later and it still would not start. Back for the battery and I have had no problem since. That battery was junk even though they said it was ok. Sam
Was it a rebuilt starter? I have seen rebuilt starters fail soon after installation. Most are ok but every once in a while you get a dud.Guessing from your name, your located in VT? If you were close enough to me I have a starter you could try. It takes me about 15 minutes to get to VT.
i'm in Topsham