Yes, nothing like comparing apples to onions.
There is nothing wrong with "upgrading" an electrical system. It's just nice to know why an older system is not working properly, especially if it is wired incorrectly in the first place.
Speaking of onions, my 1820 house had been re-wired in the 50s with a 100 amp service, 6 fuses, no ground wires (but it did have a house ground), and as many as 8 lead wires were connected to each fuse in the fuse box. During my complete rebuild, all wiring was removed and upgraded to 200-amp 40-circuit modern system because I remodelled into a new-style house.
But, of course, that is referring to my house, not to a truck that had been improperly wired in the first place.
