This all depends on "whut." If you have some large accessories, like a great big stereo, and or a GREAT big alternator (more than say, 45A) then the stock system is inadequate. In the 70's I had a 6bbl RR. It did have "some stuff." Aircraft landing lights (intermittent high speed driving lights) and some amateur radio gear. Melted the crap out of the bulkhead connector. So this was a car that was in S CA no rust, and quite new. And yet..............
Now extrapolate that to a 50 year old car...................
