I must be missing something in the picture. Looks pretty normal to me.
To measure the voltage on the end cells, measure from the main battery - wire to the bottom tap wire, and from the main battery + wire to the top tap wire.
With the battery all hooked up, if you measure (carefully) across the two outside legs on a FET, it will tell you if it's getting a gate signal. Below about 2v, it is off.
To measure the voltage on the end cells, measure from the main battery - wire to the bottom tap wire, and from the main battery + wire to the top tap wire.
With the battery all hooked up, if you measure (carefully) across the two outside legs on a FET, it will tell you if it's getting a gate signal. Below about 2v, it is off.