later model 78 amp alternator?

DaveS said

isnt it weird for a 74 duster to have a round back alternator? werent the round backs discontinued somewhere in the early 70's?

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Member 67Dart273 had several posts discussing this. During the transition to the electronic Vreg (1971-72?), some factory cars apparently came w/ round-backs w/ the "isolated field" (2 spade terminals). Also, rebuilders have done their own thing, and selling them w/ isolated field is most general if installers know to ground the extra field connection if the early Vreg.

A 78A alternator will only help if your 60A isn't keeping the battery charged over a week of driving. Otherwise, 60A is probably fine if the factory setup - i.e. no added electric radiator fan or mega-boom audio. The downside of higher amp is your wiring and dash ammeter may not appreciate it, as you get that high surge after each starter use. If you must drive 4 miles to recharge after each start, rather than 3 miles, it doesn't appreciably degrade your driving experience.