Quote Originally Posted by Six_Shooter View Post
Some datalogging cables and cables for proper scanners do have the pins for M and E jumpered together.
I had talked to a freind whos a mechanic at dealership and he told me no way... but he hasn't seen anything but OBDII for years... then I looked at my Auto Xray 7000 scan tool that does all OBDI and OBDII cars and has several plugs for ALDL ports. Well it only has one plug for OBDI GM so your right, it must have E and M jumpered.