You have to join the breaks in two places - switch and inhibitor - before it will work, in order to have 3rd and 4th gears as well as 3rd and 4th overdrive. It's just one long cable broken into four parts - power to switch to inhibitor to solenoid to earth. Two spade connectors, one in, one out - the out goes to the solenoid, through that and then to earth. Then it runs to the inhibitor switch on top of the gearbox. Input runs to the control switch, and is connected via bullet or spade connectors. However you need to control it, so that it's not on all the time, and this is in two places - the inhibitor switch, and the control switch, either gearstick or column mounted. It will run straight from the input to the overdrive solenoid, which it activates, then to earth. Power comes in (from the battery but via the ignition circuit, or wherever you take the power from. Think of the electrical circuit as a straight line. That's a very simple screw-in switch and worth replacing as they do wear. You need to control the overdrive so that it only comes on when in 3rd or 4th, so this switch is an inhibitor and activated by the gearbox levers when the 3rd or 4th gear is selected, and not in any other gear, especially reverse. Though I am now left wondering what the electrical spade connections circled in my second picture, located on the top of the box are for, I take it they are nothing to do with the overdrive unit?
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