Years ago, in a
GALAXIE far, far away ...
The system was diagnosed with a carbon pile load tester. Back then, parts weren't replaced, they were rebuilt on the bench.
You can now buy hand-held devices that will analyze a charging/starting system.
If the BAT is not up to snuff, you are chasing your tale.
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*****
- WHY IS IT ... -
... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag?
WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order)