Replace Clock and Valves with Hunter Pro-C Timer and HPV Valves ,check the wires on existing valves and see the wire that is used as the common and locate it @ the existing Timer there you go.
Nestor's Sprinklers And Lighting
Roswell,Ga.
Vincent Nestor
Nestor's Sprinklers & Lighting
Alpharetta,Ga.30022
vpn1@bellsouth.net
www.NestorsLandScape.com
www.GeorgiaLighting.net