Hi Steve
My apologies. I did not look at the start of this thread. Bert is indeed referring to a different product.
You are right, the thick Black and Red wires connect across the shunt. The yellow connects to power positive and measures the voltage in conjunction with power negative. In other words the voltage measuring part of the device is Yellow and thick Black. The current measuring is thick Black and thick Red via a Hall device. With the low current version the shunt is not used (as stated above) and 100% of the current is passed through the Hall device.
With the 100A version the shunt is used and arranged so that 10% of the current passes through the Hall device and 90% passes through the shunt. The display is scaled to read the correct total current.
The thin Black and Red wires supply power to the electronics. If using in a self powered mode the thin Red connects to supply Pos and the thin Black is left disconnected as connection between thin and thick Black is common. In this mode voltage measurement is restricted to I think max 30V and min 4.5 to 6V. If measurement outside this is required the electronics have to be externally powered and the thin Red and Black wires are connected to this external supply.
I hope this sorts out any confusion.
Cheers Bob
