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Wonder why you want to replace the original relay ? - they are robust and
although I have not opened one, the distinctive "click" that the contacts
make indicates a decent set of contacts.
What is a modern relay ? A typical automotive 30A one with the plug in base
and connection tails - not much smaller than the original ?
This relay is coil operated so minimal current is required at W2 and W1 (WP
colour) terminals.
Now regarding the wire what do you mean by thinner wire ? is this perhaps
22 ga or ?
The issue to be aware of is not so much the wire current rating but the
short circuit time ability.
The OD relay is fed by an ignition switched white wire W that is unfused
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
the fuse block terminal. A 15 or 20 A fuse would probably be OK. You don't
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
....
LMK if you want a copy.
On Mon, Sep 18, 2023 at 2:11=E2=80=AFAM john harper <ah100tech@gmail.com> w=
rote:
> 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 overdriv=
e
> engagement. In the limit, it might not even pull the armature high
> enough to disconnect the heavy coil which might then overheat including t=
he
> 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 the=
y
> 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
>> 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 t=
hought 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 th=
e
>> 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 (H=
arder to
>> bend into little spaces) and thinner wires means overheating and consequ=
ent
>> problems=E2=80=A6..
>>
>> Simon
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<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 contacts make indicates a decent set of contacts.</div=
><div>What is a modern relay ? A typical automotive 30A one with the plug i=
n base and connection tails - not much smaller than the original ?</div><di=
v>This relay is coil operated so minimal current is required at W2 and W1 (=
WP colour) terminals. <br></div><div>Now regarding the wire what do you mea=
n by thinner wire ? is this perhaps 22 ga or ?</div><div>The issue to be aw=
are of is not so much the wire current rating but the short circuit time ab=
ility.</div><div>The OD relay is fed by an ignition switched white wire W t=
hat is unfused 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 c=
hange the W wire X section you should install an inline fuse as close as po=
ssible to the fuse block terminal. A 15 or 20 A fuse would probably be OK.=
=20
You don't want your new thinner wire to become a fuse in the event of a=
fault. <br></div><div>rg</div><div>BTW have made a simplified OD wiring di=
agram that might make things easier ....</div><div>LMK if you want a copy.<=
br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gma=
il_attr">On Mon, Sep 18, 2023 at 2:11=E2=80=AFAM john harper <<a href=3D=
"mailto:ah100tech@gmail.com"; target=3D"_blank">ah100tech@gmail.com</a>> =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr">Simon<div><br></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 overdrive engagement. In the limit, it might =
not even pull the armature high enough=C2=A0to disconnect the heavy coil wh=
ich might then overheat including the thinner wire you are suggesting. 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 something th=
at worked? They knew what they were doing when they originally designed 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 Heale=
ys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@=
autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padd=
ing-left:1ex"><div><div lang=3D"EN-GB"><div><p class=3D"MsoNormal">I am put=
ting a modern relay into my OD relay. Done it before with both the 8-way fl=
asher 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 cl=
ass=3D"MsoNormal">Anyhow=E2=80=A6=E2=80=A6it=E2=80=99s a really tight fit i=
n 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 ther=
e much and is it constant when the car=E2=80=99s in OD or is it just a shor=
t burst to activate the coil and energize the solenoid? I=E2=80=99m thinkin=
g that bigger wires means less space (Harder to bend into little spaces) an=
d thinner 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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Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
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ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
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