Chony,

Hook up the inexpensive ground defeater, then using a volt-meter measure the potential difference between the ungrounded device and other devices used in the operation. If the measured voltage is less than a few volts, both AC and DC, you should not have a safety problem using the ground defeater. However, if the reading is 12 volts or higher, AC or DC, there is a potential for electric shock.

Good Luck,

Gary
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K+E=W (Knowledge Plus Experience = Wisdom.)