12 VOLT AND 16 VOLT CIRCUITS SHARING THE SAME GROUND?

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4X456

Joined Jan 25, 2017
8
I am building a mud race truck and am running a 12 v battery and a 16 v battery. the 16v battery powers all my non factory components. the 12 v battery powers all my factory components. The truck makes about 70 second runs and does not have an alternator. My question is can they share the chassis as a ground?
 
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