Subject: [Healeys] Overdrive Relay

From: Simon Lachlan via Healeys <[email-masked]>
Date: Mon, 23 Sep 2024 09:48:52 +0100

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The other day my overdrive stopped working. (For the nth time. Toyota 5
speed please Santa).
Anyhow, it failed what I called the "click test" so I was 99% sure that the
fault was electric. First off, it's fused so the wiring was unlikely to be
fried and the fuse had not blown The relay passed its bench test and the
throttle switch was OK. So, I was pretty sure it was the solenoid...maybe
the gearstick switch but didn't seem likely.
So, I dismantled down to the solenoid. Not too serious in a BT7 and much
helped by having tunnel cover held down by stainless steel screws into
rivnuts.
Put a test lamp in lieu of the solenoid. Lamp lit up when OD was "On" and
stick was to the right. So, the problem WAS in the solenoid and final proof
was its replacement by a spare which solved the problem.
I took the rubber cover off the top and there was no evidence of frying etc.
All looked good. The solenoid was dead as a dodo..putting it across a spare
12v battery didn't induce a sound or a twitch.
Now, the question(s)..are there dud ones out there? Why/how did it fail? 
Just curious...
Simon

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<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">The =
other day my overdrive stopped working. (For the nth time. Toyota 5 =
sp</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman">eed please Santa).</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">Anyhow, =
it failed what I called the &#8220;click test&#8221; so I was =
99%</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman"> sure that the fault was electric.</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> =
<FONT FACE=3D"Times New Roman">First off, it&#8217;s fused so the wiring =
was unlikely to be fried and the fuse had not blown</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> =
<FONT FACE=3D"Times New Roman">The relay passed its bench test and =
the</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> <FONT FACE=3D"Times New =
Roman">throttle switch was OK.</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> =
<FONT FACE=3D"Times New Roman">So, I was pre</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">tty sure it was the =
solenoid&#8230;..maybe the gearstick switch but didn&#8217;t seem =
likely.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">So, I =
di</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman">smantled down to the solenoid. Not too serious in a =
BT7</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> <FONT FACE=3D"Times New =
Roman">and much helped by having tunnel cover held down by stainless =
steel</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> <FONT FACE=3D"Times New =
Roman">screws into rivnuts.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">Put a =
test lamp</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> <FONT FACE=3D"Times New =
Roman">in lieu of the solenoid. Lamp lit up when OD was &#8220;On&#8221; =
and stick was to the right</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">. So, the problem WAS in =
the solenoid and final proof was its replacement by a spare which solved =
the problem.</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">I took =
the rubber cover off the top and there was no evidence =
of</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman"> frying etc. All looked good.</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"><FONT FACE=3D"Times New Roman"> The solenoid was dead as =
a dodo&#8230;.putting it across a spare 12v batter</FONT></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">y didn&#8217;t induce a =
sound</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman"> or a twitch</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman">.</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">Now, =
the quest</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman">ion(s)&#8230;&#8230;are there dud ones out there? =
Why</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman">/how</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman"> did it fail?</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"> </SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New Roman">Just =
curious&#8230;&#8230;.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-gb"><FONT FACE=3D"Times New =
Roman">Simon</FONT></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN><SPAN =
LANG=3D"en-gb"></SPAN><SPAN LANG=3D"en-gb"></SPAN></P>

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