My 4x4 is not working as it should,it won't engage when switch is pressed.I have power to the switch and power to one vacum switch in the rear panel,don't know if i should have power to the other one?......any idea's or wireing diagram so i could trace !...any idea where the 4x4 solinoid that engages it is .......answers on a post card..... or better still on this site........... my thanks in antisipation ???? - (#1890) chris, 16 Jan 02

There should be a vacuum feed to the two solenoids in the rear panel. The switch just changes over the supply to them to pull the actuator in and out. - (#1892) david miller, 17 Jan 02