mantycarguy

Alright guys, I need some help with a standalone harness I am building. Have 99% completed and plugged in my 0411 ecm to do some voltage checks and found that on 3 pins to the trans 13 pin connector -pins R,P and N show a drop in voltage of 1.5 volts in comparison to any other key switched power device.Is this built into the ecm? All voltages read 14.2 except for these 3 which read 12.7. These 3 pins are for the manual valve position switch. The harness I am using is from an 02 silverado 2500hd vinU.