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Re: [Healeys] Ignition Circuit

To: Patrick & Caroline Quinn <p_cquinn@tpg.com.au>
Subject: Re: [Healeys] Ignition Circuit
From: Per Schoerner <per@schoerner.se>
Date: Mon, 3 Jun 2019 11:53:15 +0200
Cc: healeys@autox.team.net
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <004201d512c9$dc3b06c0$94b11440$@tpg.com.au> <CAB3i7L+ABZpnmSxd7c2Xo0-ypQ6Yj1vkABrkXT4mj=rxT3VoEg@mail.gmail.com> <001a01d51923$18f07820$4ad16860$@tpg.com.au>
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Patrick
Ideally you should control a relay by that switch, and connect the relay dir=
ectly to the battery and the fan.=20

Per

Skickat fr=C3=A5n min iPhone

> 2 juni 2019 kl. 11:10 skrev Patrick & Caroline Quinn <p_cquinn@tpg.com.au>=
:
>=20
> Greetings
> =20
> All fixed and running as I wanted it to.
> =20
> Many thanks to everyone who took the trouble to write and let me know thei=
r thoughts. Much appreciated!
> =20
> As much as realise that they work, I wanted to remove the thermo switch co=
ntrol of the electric fan. Remember this is a real Healey that dates from 19=
48 and the under-bonnet switch with its wires and capillary tube just looked=
 out of place and plain ugly. What I eventually did was to run a power wire f=
rom the input of the combined ignition/light switch, through an inline fuse t=
o a switch and on to the fan which is earthed at the side of the radiator.
> =20
> Works well and does not impact on the ignition light. It does of course se=
nd the ammeter needle way into the negative, but it did that before when it w=
as controlled by the thermo switch.
> =20
> I managed to hide the wires so under the bonnet looks like it did when it l=
eft the Donald Healey Motor Company in 1948.
> =20
> Hoo Roo
> =20
> Patrick Quinn
> Blue Mountains, Australia
> =20
> From: Michael Salter [mailto:michaelsalter@gmail.com]=20
> Sent: Saturday, 25 May 2019 9:09 PM
> To: Patrick and Caroline Quinn
> Cc: healeys@autox.team.net
> Subject: Re: [Healeys] Ignition Circuit
> =20
> Hi Patrick,  I would agree that using the fused connection on the "ignitio=
n switched" side of the fuse block as the source would be a good idea. The i=
gnition switch is not fuse protected so by using that as a source you do run=
 a risk of "letting the smoke out" should a short to ground occur in your fa=
n system.=20
> You may find that the electrical demands of your fan are more than the fus=
es can handle as the system was not designed with heavy continuous loads in m=
ind.=20
> To circumvent that issue you could use the unfused side of the "ignition s=
witched" section of the fuse block as the source and install an "in line" fu=
se to protect the fan circuit.=20
> I cannot overemphasize the importance of protecting the fan circuit with a=
 fuse, it very easy to damage a wiring harness and replacing one is a major u=
ndertaking.=20
> =20
> M
> =20
> On Sat, May 25, 2019, 3:17 AM Patrick & Caroline Quinn, <p_cquinn@tpg.com.=
au> wrote:
> Hello
>  Seeking advice from those who understand automotive electrics.
>  My real Healey has an electric fan in front of the radiator that was cont=
rolled by a thermo switch. Worked reasonably well, but drew quite a bit of p=
ower but nothing concerning. When on, the amp gauge needle would always hove=
r in the negative.
>  Personally I don=E2=80=99t like thermo switches, so the fan has now been w=
ired direct and operated by a discreet switch under the dash. Power is taken=
 directly from the outgoing side of the ignition switch so that the fan only=
 comes on when the ignition is on along with the specific switch.
>  Works well, but now when the fan goes on the ignition light is illuminate=
d and will not go out.
>  Does that mean that the ignition circuit doesn=E2=80=99t like what I have=
 done? I am thinking of taking the power direct from the incoming side of th=
e ignition switch so that the fan is powered direct from the battery. Would t=
hat work?
>  Any electrical whizzes out there?
>  Thanks
>  Patrick Quinn
> Blue Mountains, Australia
>=20
>=20
>                                       =09
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Patrick<div>Ideally you should control a re=
lay by that switch, and connect the relay directly to the battery and the fa=
n.&nbsp;</div><div><br></div><div>Per<br><br><div id=3D"AppleMailSignature" d=
ir=3D"ltr">Skickat fr=C3=A5n min iPhone</div><div dir=3D"ltr"><br>2 juni 201=
9 kl. 11:10 skrev Patrick &amp; Caroline Quinn &lt;<a href=3D"mailto:p_cquin=
n@tpg.com.au">p_cquinn@tpg.com.au</a>&gt;:<br><br></div><blockquote type=3D"=
cite"><div dir=3D"ltr"><meta http-equiv=3D"Content-Type" content=3D"text/htm=
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--><div class=3D"WordSection1"><p class=3D"Ms=
oNormal"><span style=3D"font-size:11.0pt">Greetings<o:p></o:p></span></p><p c=
lass=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></span>=
</p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">All fixed and ru=
nning as I wanted it to.<o:p></o:p></span></p><p class=3D"MsoNormal"><span s=
tyle=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></span></p><p class=3D"MsoNormal"=
><span style=3D"font-size:11.0pt">Many thanks to everyone who took the troub=
le to write and let me know their thoughts. Much appreciated!<o:p></o:p></sp=
an></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</=
o:p></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">As mu=
ch as realise that they work, I wanted to remove the thermo switch control o=
f the electric fan. Remember this is a real Healey that dates from 1948 and t=
he under-bonnet switch with its wires and capillary tube just looked out of p=
lace and plain ugly. What I eventually did was to run a power wire from the i=
nput of the combined ignition/light switch, through an inline fuse to a swit=
ch and on to the fan which is earthed at the side of the radiator.<o:p></o:p=
></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nb=
sp;</o:p></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">=
Works well and does not impact on the ignition light. It does of course send=
 the ammeter needle way into the negative, but it did that before when it wa=
s controlled by the thermo switch.<o:p></o:p></span></p><p class=3D"MsoNorma=
l"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></span></p><p class=3D"=
MsoNormal"><span style=3D"font-size:11.0pt">I managed to hide the wires so u=
nder the bonnet looks like it did when it left the Donald Healey Motor Compa=
ny in 1948.<o:p></o:p></span></p><p class=3D"MsoNormal"><span style=3D"font-=
size:11.0pt"><o:p>&nbsp;</o:p></span></p><p class=3D"MsoNormal"><span style=3D=
"font-size:11.0pt">Hoo Roo<o:p></o:p></span></p><p class=3D"MsoNormal"><span=
 style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></span></p><p class=3D"MsoNorma=
l"><span style=3D"font-size:11.0pt">Patrick Quinn<o:p></o:p></span></p><p cl=
ass=3D"MsoNormal"><span style=3D"font-size:11.0pt">Blue Mountains, Australia=
<o:p></o:p></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt=
"><o:p>&nbsp;</o:p></span></p><p class=3D"MsoNormal"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&q=
uot;">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fa=
mily:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Michael Salter [<a href=3D"=
mailto:michaelsalter@gmail.com";>mailto:michaelsalter@gmail.com</a>] <br><b>S=
ent:</b> Saturday, 25 May 2019 9:09 PM<br><b>To:</b> Patrick and Caroline Qu=
inn<br><b>Cc:</b> <a href=3D"mailto:healeys@autox.team.net";>healeys@autox.te=
am.net</a><br><b>Subject:</b> Re: [Healeys] Ignition Circuit<o:p></o:p></spa=
n></p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p><div><p class=3D"MsoNormal=
">Hi Patrick,&nbsp; I would agree that using the fused connection on the "ig=
nition switched" side of the fuse block as the source would be a&nbsp;good i=
dea. The ignition switch is not fuse protected so by using that as a source y=
ou do run a risk of "letting the smoke out" should a short to ground occur i=
n your fan system.&nbsp;<o:p></o:p></p><div><p class=3D"MsoNormal">You may f=
ind that the electrical demands of your fan are more than the fuses can hand=
le as the system was not designed with heavy continuous loads in mind.&nbsp;=
<o:p></o:p></p></div><div><p class=3D"MsoNormal">To circumvent that issue yo=
u could use the unfused side of the "<span style=3D"font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;">ignition switched" section of the fuse block a=
s the source and install an "in line" fuse to protect the fan circuit.&nbsp;=
</span><o:p></o:p></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;">I cannot overemphasize the i=
mportance of protecting the fan circuit with a fuse, it very easy to damage a=
 wiring harness and replacing one is a major undertaking.&nbsp;</span><o:p><=
/o:p></p></div><div><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p></div><div><=
p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;san=
s-serif&quot;">M</span><o:p></o:p></p></div></div><p class=3D"MsoNormal"><o:=
p>&nbsp;</o:p></p><div><div><p class=3D"MsoNormal">On Sat, May 25, 2019, 3:1=
7 AM Patrick &amp; Caroline Quinn, &lt;<a href=3D"mailto:p_cquinn@tpg.com.au=
" target=3D"_blank">p_cquinn@tpg.com.au</a>&gt; wrote:<o:p></o:p></p></div><=
blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0=
cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm"><div><div><p class=3D"MsoNo=
rmal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello<o:p=
></o:p></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margi=
n-bottom-alt:auto">&nbsp;Seeking advice from those who understand automotive=
 electrics.<o:p></o:p></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt=
:auto;mso-margin-bottom-alt:auto">&nbsp;My real Healey has an electric fan i=
n front of the radiator that was controlled by a thermo switch. Worked reaso=
nably well, but drew quite a bit of power but nothing concerning. When on, t=
he amp gauge needle would always hover in the negative. <o:p></o:p></p><p cl=
ass=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:aut=
o">&nbsp;Personally I don=E2=80=99t like thermo switches, so the fan has now=
 been wired direct and operated by a discreet switch under the dash. Power i=
s taken directly from the outgoing side of the ignition switch so that the f=
an only comes on when the ignition is on along with the specific switch.<o:p=
></o:p></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margi=
n-bottom-alt:auto">&nbsp;Works well, but now when the fan goes on the igniti=
on light is illuminated and will not go out.<o:p></o:p></p><p class=3D"MsoNo=
rmal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">&nbsp;Doe=
s that mean that the ignition circuit doesn=E2=80=99t like what I have done?=
 I am thinking of taking the power direct from the incoming side of the igni=
tion switch so that the fan is powered direct from the battery. Would that w=
ork?<o:p></o:p></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;m=
so-margin-bottom-alt:auto">&nbsp;Any electrical whizzes out there?<o:p></o:p=
></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bott=
om-alt:auto">&nbsp;Thanks<o:p></o:p></p><p class=3D"MsoNormal" style=3D"mso-=
margin-top-alt:auto;mso-margin-bottom-alt:auto">&nbsp;Patrick Quinn<o:p></o:=
p></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bot=
tom-alt:auto">Blue Mountains, Australia <o:p></o:p></p></div></div></blockqu=
ote></div></div><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2">
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