Re: R11 Overdrive indicator connections?

Posted by HH56 On 2018/5/23 11:15:48

If you have installed per the drawings above, the light is telling you when the solenoid is powered and able to engage OD just as it does in the R9. Your governor is apparently coming in at 28 mph which is a tad higher than the usual of around 20-22 mph but the actual engagement speed is dependent on several other factors so not an absolute.

The solenoid just being powered is not quite enough to completely engage OD. When the solenoid gets power it can only move so far because there is a mechanical part of the mechanism blocking the pawl the solenoid is trying to push from moving more than a fraction of an inch. When it comes on the light is an indication that you can now release the accelerator to lower engine speed. The slowdown of the engine while the rear wheels are still going the same speed lets part of the OD mechanism move backwards a tiny bit to line up the OD gears and unblock the pawl which the solenoid is trying to move inward.

Once the gears are in line and blocking mechanism is out of the way the solenoid engages fully and you are in OD as soon as you push the accelerator and resume speed again. On the R9 when the solenoid is fully extended and car is in OD a set of contacts in the solenoid open to disable the light but in the R11 there are no other contacts so the light will stay on as long as the solenoid has power.

Light will go out for a few moments when you engage kickdown such as when passing a car. The sequence there is the kickdown switch opens the circuit from the governor which drops the relay and kills power to the solenoid. Ign cutout makes engine miss a few milliseconds to release torque so OD can drop out. As soon as you pass and then release the accelerator enough that the kickdown switch closes again the relay powers the solenoid and light will come on again since you are still above the 28 mph. The rest of the kickdown end is just a matter of the solenoid re engaging the pawl. The mechanical will work similar to before. The light will still remain on as long as the solenoid has power.