Once in a great while something comes along that makes you slap yourself on the forehead (ala Homer Simpson) and wonder why you didn’t think of that. The Teslite (teslite.com) test lead is one of those items – a very simple tool that can find a bad connection or contact with a quick push of a button.
46RE and 47RE units (and some 42/44RE units after 1996) use an interesting method to energize the coil of the transmission-control relay. As we all know, the switch part of the transmission-control relay is what provides battery power to the solenoids when its coil is energized.
EEC-IV and EEC-V systems sometimes may exhibit odd behavior such as erratic shifting, OD or engine light blinking, nonsense or unrelated codes, with no apparent cause.