I have a consstant drain on my battery of .13 amps. It's a 1967 390 fair lane. The battery draw takes place with all fuses disconnected, alternator and voltage regulator disconnected. I recently replaced the light switch so I removed it last night bit I still a .13 amp draw on the battery. I installed new gauges recently but they are routed thru the fuse box. I added a ground from the engine to frame to make sure I had a good ground . I'm at wits end!!! Any suggestions?