Recently picked up a customer's truck for repairs,I replaced the ecm wire harness as it didn't start,harness was in bad shape.pulled the transmission dipstick and it was contaminated with water,flushed trans and replaced screw on filter and filter screen.now I'm not getting any forward or reverse.I'm getting 12volts to the trans solenoid when forward and when reverend is selected.when I manually push in the solenoid button the trans engages in forward.I'm stuck please lmk if anyone ever ran into this issue