I agree that the parallel resistor thing is a headache. I'm trying to swear off the math for figuring those out. With identical resistances, it's easy, but once you introduce different resistances, it becomes a real PITA, IMO.

I didn't realize there were more than a single shunt in the ammeter on our trucks.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.