What is the single electrical wire on these trans. for and how do you wire it in?This is not a 200r4, but the light duty one put in in place of th350's in some cases.Wire has same plug as on a 350, but goes into the side,horizontally behind the shifter, instead of plugging into the plug vertically on the 350.It is not a reverse light switch,cause we found that on the column.Don't think it is a converter lockup.This was in a 86 Impala, which I an using motor/trans, column out of.