Funny you mention "spares". When I had my undiagnosed charging problem in my '76 (ended up my arch nemesis the alt ground wire) I was carrying a spare fully charged battery. I had to use it once when70 miles from home. That particular car could apparently run 70 miles with no accessories on with a fully charged battery.
Now days I lean toward PM over spares. On my current beater the only spares I carry in the car are fuses, tire, and AMM. I do carry at least a quart or motor oil, tranny fluid and 3 quarts of drinking water.
As PM I pulled the regulator brush pack and checked the length when I was replacing the acc bushings. I also resoldered all the plastic case relays and replaced the failed pink-label ecu. Oh, and I replace the alt ground wire just because.
Of course I still carry more tools than I should but that has more to do with the fact that this is also the car I drive to work on our "race" car.
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