Alternator failure
Symptoms
Battery warning light comes on, battery goes flat, dim lights.
Cause
Brushes wear out, diodes fail, bearings seize, voltage regulator packs up.
Fix
Test alternator output with a multimeter, should see 13.8-14.4V at idle.
If output is low, remove the alternator and have it tested/rebuilt, or fit a reconditioned unit.
Bosch alternators are rebuildable and parts are available.
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