Vehicle Battery & Alternator Diagnostics

What is the minimum cranking voltage threshold across a battery when starting an engine on a healthy starting system?

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 Correct IncorrectAbout 9.6 Volts at around 70°F during cranking is a common rule of thumb. If voltage drops below that, confirm temperature and state of charge, then check for a weak battery, excessive starter draw, or high-resistance connections.

What is the minimum cranking voltage threshold across a battery when starting an engine on a healthy starting system?

• 6.0 Volts
• 9.6 Volts (at 70°F minimum under starter load)
• 12.6 Volts
• 1.5 Volts