[Fot] A type overdrive problem

[Richard Taylor]

A high impedance 3rd/4th gear selector switch?

 
Sent from my iPhone

On Oct 3, 2012, at 11:50 AM, Bud Rolofson <levilevi at comcast.net> wrote:

> The OD on my TR6 stopped working so I did the trouble shooting process  
> in Dan Master's electrical manual and found I have voltage all through  
> the circuit all the way to the bullet that connects the (yellow with  
> purple stripe) wire to the solenoid. The voltage can be switched on  
> and off with the OD selector switch on the column so everything works  
> up to the point where it connects to the solenoid. But the solenoid  
> doesn't engage.
> 
> So the solenoid is bad right? What has me stumped is that the solenoid  
> will operate if I hook it directly to an extra battery that I have.  
> Why would it work with 12 volts directly but not 12 volts through the  
> circuit? I even swapped out another solenoid from another A type OD  
> and that one does exactly the same thing. Works with a direct hookup  
> to a battery but not with the circuit. I checked to see if the  
> solenoid is grounded and it has continuity according to my meter.
> 
> With the solenoid hooked to the system when I engage the OD switch the  
> voltage goes as far as the bullet but doesn't register at the  
> solenoid. It's as if the solenoid "clogs" the flow of the voltage.
> 
> What could be causing the solenoids to work with a direct battery  
> (voltage measured at 12.11) but not with the circuit (voltage measured  
> at 12.75)?
> 
> I'm stumped. How can both solenoids work in one situation and not the  
> other?
> 
> Thanks
> Bud Rolofson
> 
> 
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 66TR4A CTC57529 (The Project)
> 71F-250 Camper Special (Triumph Support Vehicle)
> Z-50A Hardly Davidson 1977 Honda Mini-Trail Bike (Triumph Pit Bike)
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