I agree with bob.. don't muck with it unless you know if it is a circuit.. or b circuit.
you can check this by checking the field coil wireing in the genny.. or by peaking at the back of the reg.. if it has visible bias resistors ont he bottom, check to see if there is a single resistor from ground to field.. if so, it is an A circuit unit. If there is a bias resistor from ARM to field, then it is a B circuit reg. ( B circuit regs may ALSO have a 2nd bias resistor hooked up.. )
A circuit.. polarize by jumping BAT/ARM
B circuit.. polarize by jumping BAt/FLD
Me? .. I'd let sleeping dogs lie and hook old battery up just like new one.. and heck.. even check to see if old battery wasn't charged backwards too!
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