Yeah, the vacuum pump "jitter" is back. Not sure why. It seemed to start again after I installed a vacuum reservoir, but that could be coincidence. I wonder if it is incorrect vacuum switch placement. Right now it is between the reservoir and pump/brake booster. I wonder if it would stop "jittering" if I added another fitting to the reservoir and hooked it up directly there instead of teeing it in wherever......
Here is the schematic for the battery monitoring system:
The reason I power the system voltmeter with a 9V battery is because it is a very cheap eBay voltmeter that has a low-resistance connection between the power side ground and measured side ground. If powered by the car's accessory battery it makes a connection between the traction side and accessory electrical systems, and I have been shocked because of this before.
