Obd reader says no power from truck

Hi all,
I just bought a new OBD II code reader and I am getting an error (Erpr) that, according to the manual, means the reader is not getting power from the plug and I should check for a burnt fuse. I looked at all the fuses and cannot find any that are out. I know that the reader works because I tried it on my wife's car and it worked just fine. My truck is a 2000 Silverado 2500 4WD with a 6.0 engine and the OBD II reader is an Equus Innova 3100. If anyone has an idea how to get this working please let me know, this is driving me nuts. Thanks

Jimbo

Does the cigar lighter work?
Its the same fuse

My truck does the same thing. The plug is junk, loose pins, I wiggle it and hold it just right and it works..

I have the same model reader. It works fine in my 03 Silverado.