A technician inadvertently connected together positive and negative banana jack test lead plugs connected to energized high voltage (>200 Volts direct current) (HV DC) battery terminals. This resulted in a short circuit of the HV DC battery pack resulting in an immediate overheating of one banana jack test lead plug connector causing the wire to melt. The immediate overheating of the connector caused two thermal contact first degree burns resulting in one small blister on each of the third and fourth digit fingers at the tip of the nail beds. Lesson Learned: When troubleshooting energized systems, after identifying an electrical issue, the system must be returned to "zero energy" using lockout/tagout before attempting to correct the problem.
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