I just moved my M20 Xtreme from my 02 Bonneville to a new Buick Lacrosse.
I could not easily find a switched 12V power supply under the dash, and I don't have any special equipment to test a wire for voltage without cutting into it, so I wired it up to a constant 12V source.
Is it harmful to the jammers to leave power to the system for a long period of time? I plan to switch it off whenever I think of it but chances are, I'm not always going to remember.
Otherwise, is there such a tool that can used to test a low voltage wire without stripping it? I know there is one for high AC voltage but what about 12V DC?