[Healeys] Ignition Circuit

Roger Grace roggrace at telus.net
Sat May 25 10:23:43 MDT 2019

Suggest that you consider powering the fan via a relay (reduces current through ign switch) and also an in line fuse for good practice when adding new circuits.
Also as Perry says the ign warning light coming on is not a complete disaster. It just tells you you are at full capcity and you could probably drive for a few hours if your batt is OK. Sounds like you have an ammeter - just keep an eye on it when using the fan and note the discharge the current -  probably less than 5A - and note too the increased make up charging current after you switch off the fan.rg
----- Original Message -----
From: Patrick & Caroline Quinn <p_cquinn at tpg.com.au>
To: 'Michael Salter' <michaelsalter at gmail.com>
Cc: healeys at autox.team.net
Sent: Sat, 25 May 2019 05:24:07 -0600 (MDT)
Subject: Re: [Healeys] Ignition Circuit


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-->Hello Michael And to obtain a wiring harness for a real Healey would mean that it has to be specially made. Thanks Patrick Quinn From: Michael Salter [mailto:michaelsalter at gmail.com] 
Sent: Saturday, 25 May 2019 9:09 PM
To: Patrick and Caroline Quinn
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Ignition Circuit Hi Patrick,  I would agree that using the fused connection on the "ignition switched" side of the fuse block as the source would be a good idea. The ignition 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 fan system. You may find that the electrical demands of your fan are more than the fuses can handle as the system was not designed with heavy continuous loads in mind. To circumvent that issue you could use the unfused side of the "ignition switched" section of the fuse block as the source and install an "in line" fuse to protect the fan circuit. 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 undertaking.  M On Sat, May 25, 2019, 3:17 AM Patrick & Caroline Quinn, <p_cquinn at 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 controlled by a thermo switch. Worked reasonably well, but drew quite a bit of power but nothing concerning. When on, the amp gauge needle would always hover in the negative. Personally I don’t like thermo switches, so the fan has now been wired 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 illuminated and will not go out. Does that mean that the ignition circuit doesn’t like what I have done? I am thinking of taking the power direct from the incoming side of the ignition switch so that the fan is powered direct from the battery. Would that work? Any electrical whizzes out there? Thanks Patrick QuinnBlue Mountains, Australia Virus-free. www.avast.com_______________________________________________
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