[TR] TR3A Locks Up

[David Brister]

It might be useful if I share my very recent experience after taking my TR4A 
for it'sofficial biennial roadworthiness check. I too found the car 
reluctant to go backwards. I suspected rear drums binding in some way but 
they were perfect. Then I realised the overdrive was clicking when I turned 
on the ignition. Overdrive was permanently engaged.
I sat down with the wiring diagram and realised the only thing could be a 
short to ground between the relay and the overdrive switch. All was well 
with the relay and the wiring there so I opened the cover on the steering 
column and looked at the overdrive switch. Wth o/d switch free the fault 
disappeared.
It seems the examiner whilst looking for the dipswitch or the indicator 
switch had given the o/d switch (perhaps all the switches) a hard yank thus 
turning it towards the indicator switch so that the live yellow green wire 
was touching ground.
Incidentally despite my fears, the o/d came to no harm in spite of several 
trial runs backwards during investigations.

David Brister
1976 TR4A 


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