Alternator
Race Director
Joined: Oct 2000
Posts: 12,628
Likes: 3,099
From: Shamong, NJ
If you have air conditioning and/or the rear defogger, your 78 should have come with a 63 amp alternator. If you don't have either of those options, then it came with a 42 amp alternator. The choice of engine, L-48 or L-82, had no bearing on the alternator GM used.
