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Connecting Speedometer and Electric Controls The overdrive is shipped with an analog electronic control unit (Photo 15) that serves as a junction box for all wiring. The control unit also prevents the overdrive from being engaged at speeds slower than 20 mph and prevents the overdrive from being operated in reverse. The electronic control includes provisions for additional external lockouts to be hooked into the system. The Gear Vendors overdrive can be installed without the control box and there are strong advocates for the simplified installation. Some installations experienced problems with the digital control units that were supplied by Gear Vendors in the past, such as dropping out of overdrive. This problem may be related to RF (radio frequency) interference generated by the Ghost’s unshielded ignition system or the digital unit’s voltage sensitivity. The magneto is particularly suspect since it generates an inordinate amount of RF. If the digital control box is used, it should be placed as far away from the ignition components as possible to minimize the problem. Gear Vendors recommends that their analog control box be used on the Silver Ghost due to the reduced potential for RF interference and the fact that the analog unit is less susceptible to voltage variances than the digital unit. A Ghost may experience a drop in voltage when the car is started or when lights are turned on, potentially damaging the voltage sensitive digital control box. Gear Vendors will substitute an analog control box for the digital controller. The overdrive can be connected and energized without the control box; however, Gear Vendors requires dealer installed units to have the control box installed in order to retain the manufacturer’s warranty. Bill Kennedy and Steve Litman installed an overdrive solely with a switch wired to provide power to the solenoid, thereby engaging the overdrive. This installation eliminates the potential problems of the electronic control unit and simplifies the installation. Without the electronic control box, it’s important to install some form of lockout where the overdrive cannot be engaged in lower gears or in reverse. The overdrive is not designed to work in reverse; and at speeds slower than 20 mph. At slow speeds, the overdrive’s internal hydraulic pump does not create enough pressure to hold the overdrive clutch tight and will result in the clutch slipping. If you are the least bit forgetful, you should install the control box to eliminate any chance of leaving the overdrive engaged in slow speeds or in reverse.
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Section 1 - Disconnecting Torque Tube |
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