It appears that you may be on the right track. An alternator will charge better at a higher rpm than it does at idle, but then, that depends on how low your idle is set and the alternator itself as well..
good luck.
__________________
Dan
'77 Cutlass Supreme
'46 2 door
"The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.
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