I came back from a longer than normal run recently and found the radio/sub amp having issues when I pulled into the driveway which came good when headlights were turned off. The 14V I had across the battery with engine running quickly dropped away to around 12.8V with engine off. Battery is an Optima Yellowtop installed in October.

A quick tally of the current (lowbeams/tails/electric fans) added to around 41Amps without radio and sub considered.

I checked the Delco Remy 1100794 alternator's rating ... it's only 37A!! so the battery was slowly discharging when driving.

Although the Remy recommended replacement (p/n 20169) rated at 61A would probably be ok I am wondering if there are 'standard' upgraded types in use in FGFs which keep the look of the original but have higher output, say 70-80 Amps?