88 k5 power window problem

[Hawkins]

I purchased an 88 k5 jimmy about a week ago and the passenger side pwr window would roll down but not up, so i figured id go ahead and replace the window motor and switch.
So, with a new motor installed on the regulator( not installed in the door yet)
and a new switch i decided to make sure it worked before I completed installation, and I'm glad that I did. I tried to roll the mechanism up... nothing,
tried to roll it down , down it goes.... checked all connections , all seemed fine.
checked power supply to switch, 12.3 v, checked each position on switch while pushing switch up and down , 12 v.. checked the terminal that plugs into window motor while working switch.. 12v on each depending on direction of switch... I'm at a loss.
any suggestions would be greatly appreciated.
Thanks in advance.
Hawkins