[Fot] A type overdrive problem

[Bud Rolofson]

Yes I tested it and got continuity from the solenoid body to the  
transmission and to the body. As far as I can tell the solenoid  
grounds itself with the bolts used to attach it to it's bracket on the  
OD. I'll try to ground it at known working ground locations like the  
battery itself.

Thanks
Bud

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)







On Oct 3, 2012, at 12:49 PM, Tim Murphy wrote:

> Sounds like a grounding problem.  Did you measure the voltage at the
> solenoid between the bullet connector and the ground of the  
> battery?  I
> would also try running a ground wire direct from the battery to the  
> "case"
> or ground of the solenoid and trying that.
>
> Tim
>
> -----Original Message-----
> From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net]  
> On
> Behalf Of Bud Rolofson
> Sent: Wednesday, October 03, 2012 10:51 AM
> To: FOT List
> Subject: [Fot] A type overdrive problem
>
> 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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