Use a digital multimeter, leads across the battery posts, everything turned off, A fully charged battery is around 12.6 volts. Start the vehicle, take the reading again, is should be around a volt higher, if it is, the charging system is working.
Check the vehicle in the dark, interior--glove box-- under the hood-- in the trunk, for any lite that may stay on all the time and cause battery drain. You can check amp draw for the battery, if drain is excessive, you can pull fuses one at a time till drain goes away or returns to normal. The last fuse that you pulled, that corrected the problem, is the problem circuit.
Friday, July 20th, 2018 AT 3:45 PM