Please do not use the gold screw connections to measure the accumulator pack voltage - this won't work.
Always use the silver connections to measure the accumulator pack voltage.
The FT-60 CHG terminal charges with about 200mA whatever the accumulator pack voltage - up to 10 to 12V.
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I have just disassembled a FNB-83. (do not unscrew them, it does not help you disassembling it)
Connections seen from back and with the latch-landing and gold screws at bottom.
The silver connections at the top directly connects to six NiMH AA accumulator in series; plus(left) and ground(right).
Between cell 4 and 5 (from ground and connected in series here) there is a thermostat marked: IP505BC-B 80C. ISUZU 12C.
The leftmost gold screw connects to plus through a power Schottky diode - SR240. Physically placed between cell 5 and 6 (not connected here). ( )
The middle gold screw connects to ground.
The right screw connects to small-signal glass diode to ground. Physically placed between cell 2 and 3 (not connected here). Possibly used for end-of-charge temperature measurement.
Non of the gold screw connections are used in FT-60.
The FT-60 CHG terminal connects directy to the cell 1 ground (minus). According to the FT-60 service manual the CHG terminal charge with about 200mA ( (2.0V-0.6V)/(6.8 ohm) ). Whatever the accumulator pack voltage - up to 10 to 12V.
Thats it.
