[Healeys] Ignition Circuit

Perry healeyguy at aol.com
Sat May 25 06:11:16 MDT 2019

The ignition (no charge) warning light does not have a ground like most lights on our Austin Healey or Healey’s but ground through the “D” connector on the dynamo when no charge is being produced (engine not running, ignition on, warning light on). When the appropriate charge is being made by the dynamo it negates the power feeding the other side of the no charge warning light and the light goes out.   Kind of counterintuitive. 

Sent from Mail for Windows 10

From: Patrick & Caroline Quinn
Sent: Saturday, May 25, 2019 3:17 AM
To: healeys at autox.team.net
Subject: [Healeys] Ignition Circuit


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?


Patrick Quinn
Blue Mountains, Australia 

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