[Healeys] Ignition Circuit
Patrick & Caroline Quinn
p_cquinn at tpg.com.au
Sat May 25 05:24:07 MDT 2019
And to obtain a wiring harness for a real Healey would mean that it has to be specially made.
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.
On Sat, May 25, 2019, 3:17 AM Patrick & Caroline Quinn, <p_cquinn at tpg.com.au> wrote:
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?
Blue Mountains, Australia
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