[TR] Overdrive Woes

[Jay Holekamp]

Since when you have intermittent overdrive there is no electrical power to the
solenoid, my guess is you have a lockout switch (Moss part # 140-470) on the
transmission that sometimes doesn't close and sometimes does close. Try
jumpering this switch and if the overdrive is always on when the dash (or
steering column) switch is on, it's the lockout switch.  But very careful not
to use reverse while you have the lockout switch jumpered and overdrive
engaged, or you'll damage the overdrive.
brgds, Jay
'64 TRiumph TR4 since '67