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Phil;
So my posts aren't long enough...you want I should explain all the exceptions...;-)
...you had the unusual exception case there...and the explanation is that the AMP light lights when it sees a difference in the voltage at the battery and output from the gen/alt...normaly and typically this is caused when the gen fails to have an output, but it can certainly also happen, as in your case, when the difference is the other way around...with the gen/alt output way more than the poor battery at 13 or so volts...
You are absolutely correct!...boy, I bet the headlights were nice and white!!!
Cheers!
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