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Just posting this in case it may help anyone else. Prior to removing the front clip and really cleaning out the cooling system everything electrical was working great. Right after I got everything back together, I started experiencing cases of my brake lights mysteriously coming on….after the car was parked and off for a while. I could tap the brake pedal and they would turn off. Then, it would happen again. I know…battery disconnect…but, that is currently (pun) a pain with my disconnect switch at the battery, under the seat. And, it only happened once in a while and the lights were only on very faintly (LED bulbs). Over the next couple of weeks, it started happening more often and tapping the brake pedal didn’t always help. So, disconnect switch opened!

Four days ago now, I had a thought and decided to try it. I sprayed the brake switch contacts with contact cleaner. It seems to have fixed the problem. My conclusion is that with all the flushing of the coolant etc…I must have splashed some water/coolant/who knows what else on to the contacts and when it dried, it left a very slightly conductive film.

Anyway, If anyone else experiences this, something simple to try before tearing into things is just spraying the contacts with cleaner.

A disconnect at the battery is pretty easy to come by; I will be putting one each on my 115c and the 110.

I picked up a few of these at our swap meet last weekend:
ebay

Pulling the clip off, you might also have some minor damage to the wiring at the break light switch. I destroyed the insulation on mine on the '40 by looking at it wrong.

The whole car will be rewired with a modern kit, but that was only one of several nearly invisible wiring breaks in the ancient insulation. Coil lead to the ignition was the most problematic.

I have a disconnect at the battery. It’s just a pain to get to…lift the seat etc… Eventually, I’ll install a different switch that can be easily accessed.