Subject: [Healeys] Odd Overdrive Electrics

From: Patrick and Caroline Quinn <[email-masked]>
Date: Sun, 24 Aug 2025 09:27:57 +0000

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G'day

Thank you to those who responded concerning how best to adjust the overdriv=
e throttle switch.

Well I did what was suggested and have the overdrive cutting out when the a=
ccelerator is pressed about a fifth of the throttle opening.

I wish that was as simple as that, because what's happening next is confusi=
ng.

What's happening is that I could be driving along in top overdrive. Flick t=
he switch to "Normal" and it behaves as it should, staying in overdrive. Pr=
ess down on the accelerator and it changes down to direct top. So far so go=
od.
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".

Any ideas?

Hoo Roo

Patrick Quinn
Blue Mountains, Australia

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<p class=3D"MsoNormal">G&#8217;day<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thank you to those who responded concerning how best=
 to adjust the overdrive throttle switch.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"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.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I wish that was as simple as that, because what&#821=
7;s happening next is confusing.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What&#8217;s happening is that I could be driving al=
ong in top overdrive. Flick the switch to &#8220;Normal&#8221; and it behav=
es as it should, staying in overdrive. Press down on the accelerator and it=
 changes down to direct top. So far so good.
<o:p></o:p></p>
<p class=3D"MsoNormal">Ease up on the accelerator and does it stay in direc=
t top? No, it goes back into overdrive even though the dash switch is still=
 on &#8220;Normal&#8221;.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Any ideas?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hoo Roo<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Patrick Quinn<o:p></o:p></p>
<p class=3D"MsoNormal">Blue Mountains, Australia<o:p></o:p></p>
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From: Hank Leach via Healeys <[email-masked]>
Date: Sun, 24 Aug 2025 16:15:32 +0000 7bbT5EY+/5rt1er5pEr6vb7RvjDigIi5ji6tgibiVC96PQWsaqVqLF4LoLg6Vhgcl7l4EsLtOexN1QGuFBoUDtvreGpy6OYfiTNAotHfmCQtjun4LA5MpXP6 ctBSCBtWiKNqmv2a6YX7UA==

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<div>If that overdrive has the governor switch at the rear (which it =
should) I would check that, as it keeps the car in overdrive over 40 MPH =
and can be troublesome if dirty or broken. Regards, =
Hank<br>-------------------- <br><br>From: "Bob Haskell via Healeys" =
&lt;[email-masked]&gt; <br>Reply-To: "Bob Haskell" =
&lt;[email-masked]&gt; <br>To: "Patrick and Caroline Quinn" &lt;p.=
[email-masked]&gt;, "Healeys" &lt;[email-masked]&gt; <br>Sent: =
August 24, 2025 at 5:57 AM PDT <br>Subject: Re: [Healeys] Odd Overdrive =
Electrics </div>
<p>Patrick,</p>
<p>Thinking out loud here.&nbsp; The =
hydraulic pump in the overdrive is always supplying pressure.&nbsp; When =
you turn the OD switch to Overdrive the solenoid moves a linkage in the =
overdrive to open the hydraulic valve.&nbsp; When you flip the OD switch to=
 Normal, the throttle switch keeps the solenoid energized so the hydraulic =
valve is still open.&nbsp; 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.&nbsp; So, the solenoid would have to=
 be energized to move the valve again.</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.&nbsp; 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.&nbsp; </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,</p>
<pre class=3D"moz-signature">Bob Haskell
Austin-Healey 3000 roadster =
registrar</pre>
<div class=3D"moz-cite-prefix">On 8/24/25 05:27, Patrick =
and Caroline Quinn wrote:</div>
<blockquote>
<div class=3D"WordSection1">
<p class=3D"MsoNormal">G&rsquo;day</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Thank you to those who responded concerning how best=
 to adjust the overdrive throttle switch.</p>
<p class=3D"MsoNormal">&nbsp;=
</p>
<p class=3D"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.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">I wish that was as simple as that, because =
what&rsquo;s happening next is confusing.</p>
<p class=3D"MsoNormal">&nbsp;=
</p>
<p class=3D"MsoNormal">What&rsquo;s happening is that I could be =
driving along in top overdrive. Flick the switch to &ldquo;Normal&rdquo; =
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.</p>
<p class=3D"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 &ldquo;Normal&rdquo;.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Any ideas?</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Hoo Roo</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Patrick Quinn</p>
<p class=3D"MsoNormal">Blue =
Mountains, Australia</p>
</div>
<br>
<pre class=3D"moz-quote-pre">_________=
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</pre>
</blockquote>
<div>&nbsp;</div>

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From: Hank Leach via Healeys <[email-masked]>
Date: Mon, 25 Aug 2025 01:01:58 +0000 HHKMDGzygRMwrd/nQ1SgQheEtbmiJtvRdHammbw3KhZ2qHchuQlGM0gDyE3oXQVn4ZBSxxn4Wms22i7Y15RenioCuJuJx3d7RdU20a6CEqLSywQZD0d2GIFn StLAeyaCPG9MXWs2SlcYKw==

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<div>OK, no drawings-here is the definitive manual to use to fault check =
the overdrive.&nbsp; Note: if you have the earlier 2 relay system it's =
quite different than the one relay wiring. This is a good manual to print =
out. Hank<br>-------------------- <br><br>From: "Roger Grace" =
&lt;[email-masked]&gt; <br>To: "Bob Haskell" &lt;rchaskell@earthlink.=
net&gt; <br>Cc: "Healeys" &lt;[email-masked]&gt; <br>Sent: August =
24, 2025 at 10:58 AM PDT <br>Subject: Re: [Healeys] Odd Overdrive Electrics=
 </div>
<div>
<div>
<div class=3D"gmail_default" style=3D"font-size: =
large;">I would be suspicious of your OD switch staying closed. Exercise =
it&nbsp; and give it a squirt&nbsp;of contact cleaner.</div>
<div class=3D"gmail_default" style=3D"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=3D"gmail_default" =
style=3D"font-size: large;">Just for interest see my simplified OD cct =
sketch</div>
<div class=3D"gmail_default" style=3D"font-size: =
large;">rg</div>
</div>
<div id=3D"m_5783383256065111943DAB4FAD8-2DD7-40BB-=
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