1965 Comet Gauge problem

[Ron61]

Ok, about a month ago when I went out to start my 1965 Comet, all of the gauges on the dash didn't read until about 20 seconds after the motor was running and then they all started working. Now this is the gas gauge, temp. gauge, oil pressure, and also the windshield wipers and heater fan motor won't run until they kick in. The amp gauge just twitches back and forth and it used to be steady. I have replaced the regulator, checked what grounds I can get to without spending hours out in this cold, and haven't found the problem. I think it must be a loose ground, but since I can't find a wiring diagram anywhere around here for that old car, I will ask here. First the heater fan and wipers run off different fuses than the dash gauges, so that elimates a fuse. The battery is never down or drags when I start it cold in the morning. Could this be an alternator problem? I can't figure out why the amp gauge has started that bounching around after this started as it never did it until now. And it will show a charge if I let the lights draw the battey down some. Also at times it will just suddenly go back to being steady like it should. I am almost certain this has to do with a loose wire or ground, but since I have no wiring diagram, I don't know what would be common to all of these things. And blipping the throttle seems to make everything come on faster when I start the car. Almost as if the movement of the motor may have made a wire contact. Once they start reading they will read until I shut the engine off.

Thanks,

Ron