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No, the block will have about 12 volts, or half the battery voltage. Power to these heaters goes like this. The power in wire (on the right hand one in the above image) which flows through the first heater. Then it flows through the threaded part on the base to the second heater's base. If...

I think you missed the fact that the block they screw into is not grounded, but is isolated (electrically) from ground. Power goes into the first heater, through the block to the second heater, and from the second heater to a ground wire to the bolt (which is insulated from the block) which...