yo, from my MS Word notes;
Multi-Function Switch (MFS), Hazard & Brake Light MAY Disengage E4OD Torque Converter Lock-up; "...I was living with the torque converter unlocking with the R/H turn signal. And low and behold after I changed the L/H brake/turn signal bulb the torque converter stopped unlocking with the R/H turn signal. Don't ask me but it did fix it..."
Source: by Mike G & Miesk5 at Ford Bronco Zone Forums http://broncozone.com/topic/19380-torque-converter-unlocking-by-right-turn-signal/
I never did go through the ckt due to vision issues, today is another vision day