I have a e350 ambulance,I am getting 12.2 on the volt meter and its not starting on 1993 Ford E-350

I purchased 2 920 cranking amps batteries and when I tumble the motor it seems to tumble slow

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4 answers 2 comments
diesel i assume. ck starter for amp draw.
Hi,thank you for your reply....how to check for amp draw?
you could have a bad starter
The starter was just serviced,thank you.
Also, have alternator checked for proper recharge levels.
is battery voltage at the starter?