Need help with a Dodge Charger question.

Hello All: Cruiser here. And yes, I know this is a B-body question, but here goes anyhow. I was driving my very stock 1969 Charger last night. About 35 minutes into a 60 minute drive, I noticed the ammeter was flickering pretty wildly between plus or minus 10 amps. I also noticed that the headlamp switch was noticeably warm to the touch. I had the high beams on at the time. When I switched the headlights off, the ammeter returned to normal. I didn't notice if the headlights were flickering with the movement of the ammeter needle, as it was still light out. The car has a solid state voltage limiter in the dash, the Mopar electronic ignition conversion, and a solid state voltage regulator. I didn't notice any unusual melting or heating at the bulkhead disconnect. So what's going on here. I was quite concerned about the temperature of the headlamp switch and I don't want to start a fire in my dash. Could it be a problem with my foot dimmer switch? Headlamp switch? All underdash wiring is very stock. Ideas?