70 up charging system upgrade question

Testing coil +ve.
0 volts key OFF.
8.34 Volts key ON
10.34 Volts cranking....then it started NORMALLY while in CRANK position?
So a voltage fluctuation to coil??
I bought liquid electrical tape so going to put it on some of suspect wires under dash.
Neighbors are entertaining company outside so I'll liquid tape the wires for now.
Thanks all.

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