[TR] Troubleshooting A-type Overdrive

[Bud Rolofson]

Bill,

Your thought about checking power at the relay is a good place to  
start.  With the key in the run position and the OD lever engaged you  
should have power at the purple/yellow wire on the relay.  If you do  
have power at the P/W wire and still no OD kicking in then it'll be  
time to crawl under the tranny and start checking things there.  Dan  
Masters has a great flow chart in his book to diagnose A-type OD  
problems.

I would never have figured out that I had both a bad switch (actually  
the wire to the switch had fatigued and even though broken would  
occasionally touch together enough to engage the OD...the infamous  
intermittent problem), AND a bad relay if I hadn't had Dan's  
meticulous instructions.   Let me know if you don't have access to a  
copy and I'll try to help.  I hate it when things go bad in twos or  
threes.  I wonder if the bad ground at the switch caused the relay  
some grief and made it go bad...or maybe that they were 38 yo parts  
had something to do with it?


Bud Rolofson

71TR6 CC57365 (Good 6)
66TR4A CTC57806 (The Wreck-Almost parts)
66TR4A CTC57529 (The Project)
71F-250 Camper Special (Triumph Support Vehicle)
Z-50A Hardly Davidson 1977 Honda Mini-Trail Bike (Triumph Pit Bike)
levilevi at comcast.net




On May 12, 2009, at 10:41 PM, William Brewer wrote:

>     Dang! My wife drove my TR without asking me today and when I  
> drove the
> car tonight, the OD won't engage. When you flick the switch, there  
> is nothing.
> I suspect something electrical. I have a spare switch that I know  
> works and
> also a new solenoid, so I can change them out one at a time to see  
> if that is
> the problem. I can also check for power output on the relay. Are  
> there any
> other obvious things to check?     Is it possible to check and  
> replace the OD
> solenoid with the transmission tunnel on?     Going from having  
> overdrive and
> then back to a 4 speed is a bummer.
>     Bill in Tehachapi
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