To diagnose any problems with the charging system on a vehicle, you must first take the OCV of the battery and perform a CCA test on the battery. You do this because if the battery isn't holding enough charge then the fault may not be the chargeing system. If under load the battery cannot hold a voltage reading of 9.5 then it is a fail. It must be charged to continue the test.
If battery is fine, perform a visual check of wiring and connections. If any loose connections tighten them. Then you perform a voltage drop test across the wiring. A high result means that there is added resistance in the wire, which is drawing voltage away from the battery.
I learnt how to check the charging system for faults and how to diagnose certain problems.
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