I learn something new every day. Went to look at a potential parts van that the (original) owner is selling because he just no longer needs/wants to fool with it. Its an 85 150 passenger van 5.2/A999. The final straw was the engine just didnt want to stay running, said it would turn over and catch but as soon as the key was released from 'Start' it would die stone cold. Sounded like the classic ballast resistor failure had struck especially since he said he had never replaced it before. Went down to look at it and brought a spare resistor with me. Come to find out this thing had from the factory a 2 pin resistor and my 4 pin unit wouldnt plug in so we couldnt try it. Is there anything special as to why this thing would have only had a 2 pin unit as original ? Stopped by the store the other day and picked one up for it and going through the options for an 85 they did list a 2 or 4 pin unit... I guess they dont have a big market for them cause the 2 pin unit was $2 more vs the 4 pin unit.