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What's proper cranking voltage? 700

IMO 20 CCA isnt going to make much difference BUT id be running a minimum of 380 and preferably higher like 460CCA etc.

Voltage drop while cranking is not unusual and I cant see 10 ish volts being a major issue however there are a few things to bear in mind.

A worn starter motor (Tired brushes or shagged solenoid) which may well work fine during warmer months, will have a huge impact on how much it needs to operate correctly at colder temps and may well be dragging the voltage lower than 10 volts and possibly cranking slower which will make a difference.

Id try the other battery (Fully charged) or get a bigger unit and perhaps get your starter checked and/or rebuilt if it is of unknown condition.

Cheers,
Tony






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