Unlikely you received bad boards, more than likely poor soldering job and you got a glob of solder across some of the pads where you soldered the wires to the super chuffer or you wired it wrong. The headlight output should be no more than 3 volts, no resistor required. Are you reading 10 volts is that the cab light circuit? If so you definitely wired it incorrectly . Pack it up and send it to John with all the bad boards.
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