Too much voltage from bedroom 12v cigarette lighter port??

versicom wrote:
Upon connecting the multimeter, I get a 20v "overload" spike and then 1 second later drops to 12.8v.

Common on many auto ranging multimeters to go to a overload reading momentarily while switching to the correct range. And it is diffidently not a spike, its the meter.
It means nothing and is normal. Has nothing to do with your dc voltage problem, if you even have one...

Explain in detail what you mean by...
"smoking whatever I plug into it"...


jmo