[ard]

I noticed that my old Schuhmacher battery charger which connects to the cigarette lighter wasn't charging my P-car's battery. I connected a modern Deltran unit directly to the battery terminals and it fully charged the battery so I know it's not the battery that's the problem.

Naive question but when I plug the Schuhmacher into a 110V outlet I should be reading 12VDC across the tip of the cigarette lighter plug and the spring-loaded metal "clip" on the perimeter of the plug indicated with red arrows in the attached picture, correct? Right now I am getting 0V, which leads me to suspect that the plug has a problem.

Thanks in advance.