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Can't speak for the c7, but the 6.7cummins in our bus at work, will pull the volts down like that or more and we have 320 amp alt with 3 group 31 batteries.
1251 is a good part number that will work any were. https://www.oreillyauto.com/detail/c/eiko-lighting/eiko-bulb/eik0/1251?q=1251&pos=0
$7.89 for a box of 10 at O'Reilly's.