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Originally Posted by warmblood58
...for example 11.7 this morning so could not glow/start.
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A reading less than 12.7 volts means the battery is not fully charged. 11.7 volts is close to the lower limit, or fully discharged.
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...Charging system appears to be working but just checked volts again (with engine off) and was getting rising readings of 13.8 to 14.29???
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13.8 to 14.29 would be expected with the engine ON, not off. If you get 13.8 or so with the engine running, the battery voltage should taper off rather quickly to a steady 12.7 or so within minutes after you shut it off.
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...Is this an example of a bad alternator (diodes) feeding volts back to the battery?
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Bad diodes prevent the alternator from charging the battery.
Try measuring both DC and AC voltage right at the battery terminals. There should only be a few, if any AC volts when the diodes are rectifying properly. Shorted diode(s) will let AC through, maybe 15-20 volts or so?