Trying to wire up a set of countryman b3's. they came witrh the ta4f with only pins 1,2,3 used. 1 was ground(with ground and black wire both), 3 had the red wire and 2 and 3 are jumped together with a resisitor. Trying to put these to ta3f with no luck? Anyone got any ides. Seems easy but can't seem to get it