I have an '06 PT Cruiser that insists on displaying the Battery Trouble light. The alternator and battery both test out good, with the battery being new. The car starts normally with the light being off. After a little time, 10 seconds to 2 minutes+, ding - the battery light comes on. Testing circuits across the fuse bases shows normal except for the Interior lights fuse (shows 10v. Yes, 10) and the ignition switch supply fuse (shows 1.5v). Confused me immediately so I shut the hood and quit for the evening. Any suggestions as to where I should start this goose chase?