Stress Test Alternator for Night Highway Trips

Cost Savings

Checklist Tasks

• Measure battery voltage with engine off and at idle as charging baseline.
• Turn on headlights, high beams, and hazards to simulate night load.
• Activate rear defroster, cabin fan, and radio to add electrical demand.
• Monitor voltage under full load; confirm 13.8–14.5V output.
• Look for dimming or flickering lights under load.
• Listen for whining or grinding noises from alternator.
• Feel alternator casing for excess heat after five minutes.
• Inspect alternator belt for cracks, glazing, or slippage.
• Test power accessories for function during peak load.
• Use clamp meter to compare alternator amperage to specs.
• Check for burning smell near alternator or wiring.
• Confirm alternator fuses and relays are not blown per manual.