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Re: [Healeys] Overdrive relay.

To: simon.lachlan@alexarevel.plus.com
Subject: Re: [Healeys] Overdrive relay.
From: john harper <ah100tech@gmail.com>
Date: Mon, 18 Sep 2023 09:51:01 +0100
Cc: Healeys <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <000701d9e98b$2cbcb1b0$86361510$@alexarevel.plus.com>
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Simon

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.

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 <
healeys@autox.team.net> wrote:

> I am putting a modern relay into my OD relay. Done it before with both th=
e
> 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 th=
ought 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 the coil and =
energize
> the solenoid? I=E2=80=99m thinking that bigger wires means less space (Ha=
rder to
> bend into little spaces) and thinner wires means overheating and conseque=
nt
> problems=E2=80=A6..
>
> Simon
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<div dir=3D"ltr">Simon<div><br></div><div>If you use thinner wire to the ov=
erdrive relay it will add resistance to the heavy coil and reduce its &#39;=
pull&#39; and this might cause a slow overdrive engagement. In the limit, i=
t might not even pull the armature high enough=C2=A0to disconnect the heavy=
 coil which might then overheat including the thinner wire you are suggesti=
ng. This might then be a fire hazard.</div><div><br></div><div>All of this =
might be the worst case and perhaps I am being alarmist but why modify some=
thing that worked? They knew what they were doing when they originally desi=
gned the car electrics.</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sun, 17 Sept 2023 at 22:03, Simon Lachlan =
via Healeys &lt;<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.tea=
m.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex"><div class=3D"msg1015091139150751833"><div lang=3D"EN-GB"><div class=
=3D"m_1015091139150751833WordSection1"><p class=3D"MsoNormal">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<u></u><u></u></p><p class=
=3D"MsoNormal">Anyhow=E2=80=A6=E2=80=A6it=E2=80=99s a really tight fit in t=
here and I thought I might save some space with thinner wires this time. Wh=
at does the team think about the ampage flowing around in there? Is there m=
uch and is it constant when the car=E2=80=99s in OD or is it just a short b=
urst to activate the coil and energize the solenoid? I=E2=80=99m thinking t=
hat bigger wires means less space (Harder to bend into little spaces) and t=
hinner wires means overheating and consequent problems=E2=80=A6..<u></u><u>=
</u></p><p class=3D"MsoNormal">Simon<u></u><u></u></p></div></div>_________=
______________________________________<br>
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