[Healeys] Throttle switch on overdrive function? BJ8

[Michael Salter]

Hi Wes,
The throttle switch is used to maintain the car in overdrive until throttle
is applied. 
The purpose is to prevent the car's motion from having to accelerate the
rotating mass of the engine which would produce a reverse torque in the
overdrive unit, something it was not designed to accommodate.
When the switch is installed it provides a parallel circuit for the dash
switch when less than about 30% throttle is applied. When the throttle
passes this point, with the overdrive switch having been switched off the
overdrive will disengage.

Michael Salter
http://www.netbug.net/blogmichael/?p=445

-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net]
On Behalf Of Weston Keyes
Sent: Tuesday, October 27, 2009 12:58 PM
To: Ahealey Ahealey
Subject: [Healeys] Throttle switch on overdrive function? BJ8

Hello Folks,

     I have the 2 wires that go to the trottle
switch off. My overdrive goes off and on when I operate the switch on
the dash (as long as I am in 3rd or 4th). Is that normal? I believe
from reading the manual that the throttle switch is supposed to keep
the overdrive engaged until the throttle is off or low. Is it true that
it serves no purpose when engaging the overdrive?

Many thanks

Wes Keyes
York, Maine