You put this post in an odd place. I don't think tech support knows alternators! I generally view posting
in a time line view, but the smarter folks may not. Ask a moderator to move it. Or just repost in the appropriate forum.
Now if I were to toss out ideas...
Have you confirmed your suspensions with an amp meter?
Do you know what the batteries state of charge is at? What is the capacity of the bank? How old are they? If you are close to 80% SOC with flooded lead acid, you'd expect the amps to drop considerably.
Do you have an external controller? Maybe check its program, voltage sense wire, temp sense, etc.
If no issues there, maybe the alternator is heating
up too much causing the controller to decrease the load? An inferred thermometer can help with this.
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