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Nighthawk cm1100 has voltage coming out of cable line
I have had two CM1100 routers with the same issue. My cable line coming from my ISP keeps burning up and ISP says I have electrical issues (open neutral on my electrical) Electrician and electrical ut...
Another modem test you could run:
Repeat your modem thread AC Voltage test with a 1k Ohm (1000 Ohm) resistor connected between your red and black meter leads. This essentially converts your AC Voltmeter into an AC milliAmp meter. How many AC volts do you read? The number will indicate your AC leakage current in milliAmps. I really don't suspect it will be enough to melt a ground connection.