<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:large">I would be suspicious of your OD switch staying closed. Exercise it and give it a squirt of contact cleaner.</div><div class="gmail_default" style="font-size:large">Alternatively the OD relay could be sticking and not releasing freely. Same story connect 12v directly and cycle and listen to it.</div><div class="gmail_default" style="font-size:large">Just for interest see my simplified OD cct sketch</div><div class="gmail_default" style="font-size:large">rg</div></div><div id="m_5783383256065111943DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br><table style="border-top:1px solid #d3d4de"><tbody><tr><td style="width:55px;padding-top:13px"><a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" target="_blank"><img src="https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png" alt="" width="46" height="29" style="width:46px;height:29px"></a></td><td style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Virus-free.<a href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" style="color:#4453ea" target="_blank">www.avg.com</a></td></tr></tbody></table><a href="#m_5783383256065111943_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 24, 2025 at 6:00 AM Bob Haskell via Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p>Patrick,</p>
<p>Thinking out loud here. The hydraulic pump in the overdrive is
always supplying pressure. When you turn the OD switch to
Overdrive the solenoid moves a linkage in the overdrive to open
the hydraulic valve. When you flip the OD switch to Normal, the
throttle switch keeps the solenoid energized so the hydraulic
valve is still open. When you press on the accelerator pedal, the
solenoid de-energizes, the hydraulic valve closes and the OD goes
to direct.</p>
<p>It seems like the hydraulic valve is moving since the OD goes to
direct when you press on the throttle. So, the solenoid would
have to be energized to move the valve again.<br>
</p>
<p>When you first start out, with the OD in Normal, it doesn't
attempt to go into Overdrive, right?</p>
<p>When I am coming to a stop with the car in Overdrive, I flip the
switch to Normal, put the gearbox in neutral, and blip the
throttle. I then move the gear shift lever left and right. If I
hear the solenoid engaging when I'm next to 3rd/4th and
disengaging next to 1st/2nd, I know the OD solenoid circuit is
still energized and blip the throttle again. <br>
</p>
<p>If you put the gearbox in neutral, do you hear the solenoid when
you move the gear shift lever left/right?</p>
<p>Cheers,<br>
</p>
<pre cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
<div>On 8/24/25 05:27, Patrick and Caroline
Quinn wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal">G’day<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thank you to those who responded concerning
how best to adjust the overdrive throttle switch.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Well I did what was suggested and have the
overdrive cutting out when the accelerator is pressed about a
fifth of the throttle opening.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I wish that was as simple as that, because
what’s happening next is confusing.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">What’s happening is that I could be driving
along in top overdrive. Flick the switch to “Normal” and it
behaves as it should, staying in overdrive. Press down on the
accelerator and it changes down to direct top. So far so good.
<u></u><u></u></p>
<p class="MsoNormal">Ease up on the accelerator and does it stay
in direct top? No, it goes back into overdrive even though the
dash switch is still on “Normal”.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Any ideas?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Hoo Roo<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Patrick Quinn<u></u><u></u></p>
<p class="MsoNormal">Blue Mountains, Australia<u></u><u></u></p>
</div>
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