Since you are sure it isn't your alternator or battery it could be the belt
(too loose or otherwise worn/damaged). I can't remember the exact name but
there is a gage control/sensor near the alternator that can go bad and cause
the symptoms you described.
I checked the belt and then took it to a shop. Nothing was stored in
the computer, but they felt like it might be in the secondary ignition
system (spark plugs, wires, etc.). I picked up new plugs and wires
today. I'll see if this helps.
Check for a bad connection to the battery. Clean the cables, check the power
and ground wires from battery to engine, alt to battery, ground straps from
engine to frame ect. Wiggle wires with it running to see if you can
duplicate. Plug wires are not going to make the battery light come on when
the engine is running.
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