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Agree with all Roger said.
=20
Josef Eckert
Germany
=20
=20
=20
-----Original-Nachricht-----
Betreff: Re: [Healeys] Overdrive relay.
Datum: 2023-09-18T23:18:22+0200
Von: "Roger Grace" <roggrace@telus.net>
An: "john harper" <ah100tech@gmail.com>
=20
=20
=20
Wonder why you want to replace the original relay ? - they are robust and=
=20
although I have not opened one, the distinctive "click" that the contacts=
=20
make indicates a decent set of contacts.
What is a modern relay ? A typical automotive 30A one with the plug in base=
=20
and connection tails - not much smaller than the original ?
This relay is coil operated so minimal current is required at W2 and W1 (WP=
=20
colour) terminals.
Now regarding the wire what do you mean by thinner wire ? is this perhaps=
=20
22 ga or ?
The issue to be aware of is not so much the wire current rating but the=20
short circuit time ability.
The OD relay is fed by an ignition switched white wire W that is unfused=20
and sourced directly from A3 at the fuse block.This has the full battery=20
fault current (oomph) behind it. So if you are determined to change the W=
=20
wire X section you should install an inline fuse as close as possible to=20
the fuse block terminal. A 15 or 20 A fuse would probably be OK. You don't=
=20
want your new thinner wire to become a fuse in the event of a fault.
rg
BTW have made a simplified OD wiring diagram that might make things easier=
=20
....
LMK if you want a copy.
On Mon, Sep 18, 2023 at 2:11=E2=80=AFAM john harper <ah100tech@gmail.com
Simon
=20
If you use thinner wire to the overdrive relay it will add resistance to
the heavy coil and reduce its 'pull' and this might cause a slow
overdrive engagement. In the limit, it might not even pull the armature
high enough to disconnect the heavy coil which might then overheat
including the thinner wire you are suggesting. This might then be a fire
hazard.
=20
All of this might be the worst case and perhaps I am being alarmist but
why modify something that worked? They knew what they were doing when
they originally designed the car electrics.
On Sun, 17 Sept 2023 at 22:03, Simon Lachlan via Healeys <
I am putting a modern relay into my OD relay. Done it before with both
the 8-way flasher box and the OD relay. Works well, though this one
only managed +/-10 years. 10 years, but not so very many miles=E2=80=A6
Anyhow=E2=80=A6=E2=80=A6it=E2=80=99s a really tight fit in there and I =
thought I might save
some space with thinner wires this time. What does the team think about
the ampage flowing around in there? Is there much and is it constant
when the car=E2=80=99s in OD or is it just a short burst to activate th=
e coil
and energize the solenoid? I=E2=80=99m thinking that bigger wires means=
less
space (Harder to bend into little spaces) and thinner wires means
overheating and consequent problems=E2=80=A6..
Simon
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8"/><title></title></head><body><p style=3D"margin: 0px;"><span styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:#000000;te=
xt-decoration:none">Agree with all Roger said.<br /></span></p>
<p style=3D"margin: 0px;"> </p>
<p style=3D"margin: 0px;"><span style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:10pt;color:#000000;text-decoration:none">Josef Eckert</span>=
</p>
<p style=3D"margin: 0px;"><span style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:10pt;color:#000000;text-decoration:none">Germany</span></p>
<p style=3D"margin: 0px;"><span style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:10pt;color:#000000;text-decoration:none"> </span></p>
<p style=3D"margin: 0px;"> </p>
<p style=3D"margin: 0px;"> </p>
<p style=3D"margin: 0px;">-----Original-Nachricht-----</p>
<p style=3D"margin: 0px;">Betreff: Re: [Healeys] Overdrive relay.</p>
<p style=3D"margin: 0px;">Datum: 2023-09-18T23:18:22+0200</p>
<p style=3D"margin: 0px;">Von: "Roger Grace" <roggrace@telus.net></p>
<p style=3D"margin: 0px;">An: "john harper" <ah100tech@gmail.com></p>
<p style=3D"margin: 0px;"> </p>
<p style=3D"margin: 0px;"> </p>
<p style=3D"margin: 0px;"> </p>
<div style=3D"position: relative; color: #000000; font: 12px Arial,Helvetic=
a,sans-serif;">
<div dir=3D"ltr">
<div>Wonder why you want to replace the original relay ? - they are robust =
and although I have not opened one, the distinctive "click" that the contac=
ts make indicates a decent set of contacts.</div>
<div>What is a modern relay ? A typical automotive 30A one with the plug in=
base and connection tails - not much smaller than the original ?</div>
<div>This relay is coil operated so minimal current is required at W2 and W=
1 (WP colour) terminals. </div>
<div>Now regarding the wire what do you mean by thinner wire ? is this perh=
aps 22 ga or ?</div>
<div>The issue to be aware of is not so much the wire current rating but th=
e short circuit time ability.</div>
<div>The OD relay is fed by an ignition switched white wire W that is unfus=
ed and sourced directly from A3 at the fuse block.This has the full battery=
fault current (oomph) behind it. So if you are determined to change the W =
wire X section you should install an inline fuse as close as possible to th=
e fuse block terminal. A 15 or 20 A fuse would probably be OK. You don't wa=
nt your new thinner wire to become a fuse in the event of a fault. </div>
<div>rg</div>
<div>BTW have made a simplified OD wiring diagram that might make things ea=
sier ....</div>
<div>LMK if you want a copy.</div>
</div>
<br />
<div class=3D"gmail_quote">
<div class=3D"gmail_attr" dir=3D"ltr">On Mon, Sep 18, 2023 at 2:11=E2=80=AF=
AM john harper <<a href=3D"mailto:ah100tech@gmail.com";>ah100tech@gmail.c=
om</a>> wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; borde=
r-left: 1px solid #cccccc; padding-left: 1ex;">
<div dir=3D"ltr">Simon
<div> </div>
<div>If you use thinner wire to the overdrive relay it will add resistance =
to the heavy coil and reduce its 'pull' and this might cause a slow overdri=
ve engagement. In the limit, it might not even pull the armature high enoug=
h to disconnect the heavy coil which might then overheat including the=
thinner wire you are suggesting. This might then be a fire hazard.</div>
<div> </div>
<div>All of this might be the worst case and perhaps I am being alarmist bu=
t why modify something that worked? They knew what they were doing when the=
y originally designed the car electrics.</div>
</div>
<br />
<div class=3D"gmail_quote">
<div class=3D"gmail_attr" dir=3D"ltr">On Sun, 17 Sept 2023 at 22:03, Simon =
Lachlan via Healeys <<a href=3D"mailto:healeys@autox.team.net";>healeys@a=
utox.team.net</a>> wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; borde=
r-left: 1px solid #cccccc; padding-left: 1ex;">
<div>
<div lang=3D"EN-GB">
<div>
<p class=3D"MsoNormal">I am putting a modern relay into my OD relay. Done i=
t before with both the 8-way flasher box and the OD relay. Works well, thou=
gh this one only managed +/-10 years. 10 years, but not so very many miles&=
hellip;<u></u><u></u></p>
<p class=3D"MsoNormal">Anyhow……it’s a really tight fit =
in there and I thought I might save some space with thinner wires this time=
. What does the team think about the ampage flowing around in there? Is the=
re much and is it constant when the car’s in OD or is it just a short=
burst to activate the coil and energize the solenoid? I’m thinking t=
hat bigger wires means less space (Harder to bend into little spaces) and t=
hinner wires means overheating and consequent problems…..<u></u><u><=
/u></p>
<p class=3D"MsoNormal">Simon<u></u><u></u></p>
</div>
</div>
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</blockquote>
</div>
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