Headlight dimming, slow cranking and battery drain — verifying alternator performance under real electrical load.
What you will gain from this guide
- Test at idle and raised rpm with loads on
- Weak belts slip before alternator fails
- Check earth straps engine to chassis
Alternators on CVs with extra lighting and AC load fail gradually. Load testing catches weak units before batteries die mid-route.
Test procedure
- Measure voltage at battery with headlights and AC on
- Compare idle vs 2000 rpm — stable 13.8–14.4V typical
- Inspect belt tension and pulley alignment
Replacement
- Match alternator output rating to fitted accessories
- Order by part code from electrical catalogue
- Keep GST invoice for warranty
Need help with a part number or a fleet quote? Search the catalogue or get in touch — we deliver across India with GST invoices.
