Assuming that you have an electric shift motor(1969 I'm sure should be) this link should help you to understand how the shifter works. You can do some basic trouble shooting to see if is is a power supply problem, switch problem, or motor problem.

http://www2.dana.com/pdf/AXSM-0029.PDF

Tad


1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....