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Re: [TR] A-Type Overdrive Solenoid Question

To: William Brewer <wsb1960tr3a@att.net>
Subject: Re: [TR] A-Type Overdrive Solenoid Question
From: Randall <tr3driver@ca.rr.com>
Date: Tue, 29 Jul 2014 22:25:55 +0000
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Cc: Triumphs <triumphs@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: triumphs@autox.team.net
Sensitivity: Normal 2014 22:25:55 +0000
---- Geo Hahn <ahwahneetr@gmail.com> wrote: 
> "When the car is in 3rd gear with the key on and you throw the OD switch
> you can see the solenoid move sort of weakly."
> 
> Would this be the behavior if the pull-in coil had failed and only the
> holding coil was functioning?

That's certainly my first thought; well, actually the contacts inside the 
solenoid that supply current to the pull-in coil.  It might be that something 
else is limiting the current through the solenoid (like bad relay contacts 
maybe), but the solenoid contacts or coil would be my first suspicion.

One test is to hook up an ohmmeter from the relay output terminal to ground 
(with the ignition off).  The resistance should be less than 1 ohm.  If you get 
something closer to 10 ohms, then either the contacts aren't making contact, or 
the coil is burned out.

Randall

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