64-65 cranking voltage

[John D.]

What is the cranking voltage on a '64-'65? Thanks, JD

[Gene M.]

Re: 64-65 cranking voltage

John,
I would guess it is battery voltage. Since the alternator does not kick in till engine starts. Fully charged battery is around 12.2 to 12.5 (less resistance in system and solenoid drain) right?

[Duke W.]

Re: 64-65 cranking voltage

High current draw from the starter motor drops battery voltage during cranking. I recall seeing a spec that said it should not drop below 10.5 volts, and that would apply to any 12V automotive electrical system. If less the battery is weak or the battery doesn't have enough capacity for the current draw of the starter motor.

Low battery voltage during cranking is why the ignition ballast is bypassed in cranking mode to ensure there is enough spark energy to light the fire

Duke

[Edward J.]

Re: 64-65 cranking voltage

What is the cranking voltage on a '64-'65? Thanks, JD

John, Are you looking for voltage drop during cranking, or look for cranking amps. while cranking?