Car adapter and power cord it came with in several outlets. Still wont power up!!
You can also try the 3-pin plug, but I agree with Sofa if this is a new unit.
But, it also might be the type of cigar lighter jacks in your car. Some are not 'accessory friendly'.
I almost mentioned the possibility of reverse polarity on the lighter plug in his car (not knowing where he is from),
Does that exist? I know there are positive ground vehicles - I've worked on many of those (old Macks). But, does anyone actually make a reverse polarity cigar lighter plug?