Update on my round 2 it experiment.

If you want to know what I'm talking about scroll down to my post, Round 2 it experiment
I discovered the ammeter was responsible for the missing voltage in my series circuit.
By removing the ammeter, the sum of the voltage across the ballast and the coil voltage added to equal the battery voltage.
So the hair like lead wires to the ammeter were too small.

So I ordered 20 bananas connectors from amazon.
HiLetgo 20pcs 4MM Banana Plug Male Audio Speaker Jack Amplifier Banana Plug Terminal Connectors (10 Red + 10 Black)
I plan to make 20 voltmeters leads using 14g wire.
I have some alligator attachments so some of my leads will have a banana connector on one end of the leads and an alligator clip on the other end.

I ordered a ballast resistor from amazon for my Jubilee.
I will use the Jubilee's 6v coil and new ballast resistor.
I'll put the 6v coil in series with the ballast resistor and measure the voltage across each. If I measure the same voltage across each, coil and ballast, that will tell me each has the same resistance, 1.5 ohms.
I don't have an accurate ohmmeter that can measure 1.5 ohms.

Funnies
What do you call a super conductor?
Ohmless.
What do you call your brother that became your sister?
A trans-sister.

Do you care to share a sparkey funny?

I suspect the current shunt resistance on your HF multimeter is greater than the resistance of its puny leads. The resistance of two 3 foot 22 gauge leads is only a tenth of an ohm.

Mark
The shunt is a very short piece of 14 or 12 g copper.
Most shunts I'm familiar with are around. 001 or .0001 ohms.
The shunt in my carbon load tester is a short ribbon of metal.

After I make new meter leads I'll see if the ammeter uses less voltage.