Replace 2G Alternator With 3G Alternator
23] The completed 3G installation sure stands out, ready to supply the higher current demands of Sanchez’s future restored 1966 Galaxie. Hopped-up FE first, brand-new Coyote later?
24] Alternators have come a long way from the 1960s. According to PA Performance test data, the best “60-amp” 1G makes only 15 amps at 900 engine rpm—questionable if all accessories were running at full blast with aging wiring. The “130-amp” 3G is already making 81 amps at the same rpm! No excuse not to update today.
25] The 3G is also a smart upgrade for Ford’s first integrally regulated 2G alternators, circa mid-1980s to mid-1990s. The 2G had decent output, but suffers from reliability issues and is prone to burning up. Here’s one wiring method for replacing it with a 3G.
24FORD ALTERNATOR OUTPUT