Hi All,
Just to come back to this thread and say the issue with low alternator output (13.2 volts) with the new ($500) Ford alternator remains. I've taken the RV out a few times and the voltage never rises, although so far no battery problems from under-charging.
The mobile RV tech that installed the new alternator has stopped returning my calls, so it looks like I might be left to work this out by myself. It's either a bad alternator or it's something very rare with the PCM, although there are no other symptoms besides the lower than expected voltage output and the constant dashboard battery light.
By the way, there are no error codes being generated; only the battery light.
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