Just to add a thought to Paul's note......
I once worked on a B which had an overdrive that would not engage. There was
power to the gearbox switch and I did a continuity check on the switch and
it showed the switch to be good. After several hours of changing parts (on
the assumption the problem was in the overdrive itself) and still having no
engagement, I put a voltmeter on the gearbox switch. 12 volts going in, 4
volts coming out! Enough to show continuity on an ohm-meter but not enough
to operate the solenoid. I always check switches with a voltmeter now,
rather than an ohm-meter.....
Lawrie
British Sportscar Center
----- Original Message -----
From: "Paul Hunt" <paul.hunt1@blueyonder.co.uk>
To: "Tab Julius" <tab@penworks.com>; <mgs@autox.team.net>
Sent: Tuesday, June 08, 2004 2:10 AM
Subject: Re: Overdrive flakiness question
> You can check the complete electrical continuity from the comfort of
leaning
> over the right-hand wing. Find where the yellow/red (or similar) of the
> gearbox harness joins the white/brown of the main harness near the fusebox
> and part the connector. With a test-lamp joining the two it should glow
> with the ignition on, the gearbox in an OD gear, and the manual switch on.
> With any other combination it should be off. With intermittent failure to
> engage to can bring the test-lamp inside the cabin and watch it while you
> drive. Note that a test-lamp in series will probably stop the OD working
at
> all but at least you will be able to see if you have continuity. What
might
> be better is to use an ammeter in place of the test-lamp which will allow
> the OD to work as well as watching for continuity. But be aware that the
OD
> circuit is unfused and if your meter or test-lamp wiring floats about and
> grounds it can burn the loom. If you have continuity but the OD still
fails
> to engage the problem is mechanical or hydraulic.
>
> PaulH.
>
> ----- Original Message -----
> From: "Tab Julius" <tab@penworks.com>
> To: <mgs@autox.team.net>
> Sent: Saturday, June 05, 2004 10:04 PM
> Subject: Overdrive flakiness question
>
>
> > The last few trips I've noticed a disconcerting tendency for me to have
it
> > in fourth, put it into overdrive, and have it not respond.
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