Here is a video showing a few of my latest upgrades on the Electric Booger:
Here is the schematic for my 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.
I have actually been shocked by the car when I originally powered this voltmeter with the car's accessory power. I was tightening the nut on the power lead at the main contactor and my elbow touched a bolt on the car somewhere. Zzzzt. That is when I started powering the voltmeter with a separate small battery.
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