[Healeys] Ignition Circuit

[Kees Oudesluijs]

Nothing to worry about. The fan is drawing a lot of amps which will 
result in a negative charge hence the ign. light is coming on, probably 
only when idling. Before you most likely had the fan wired directly from 
the main circuit in series with the Amp. meter and not through the 
ignition circuit so the light might not show. You could operating the 
fan using a relay switched on by the under dash switch but getting the 
main current from the battery. It will not solve the negative charge but 
it may avoid the light coming on.

Perhaps the fan is a bit to powerful and drawing more Amps than 
necessary. However the fan is only on for a very short while unless in 
prolonged very heavy traffic and on long and slow steep inclines

The best way is to revert to the old situation with the thermo-switch 
(wired through the ignition circuit and use the manual switch as an 
override switch so when you switch of the ignition the fan will not 
work. These should switch a relay with the main current coming directly 
from the main circuit with the Ampmeter

Use a thermo-switch tot cuts in at say 90-95°C and cuts out at about 
5-10°C over the opening temperature of the thermostat.

Kees Oudesluijs



Op 25-5-2019 om 09:17 schreef Patrick & Caroline Quinn:
>
> 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 Quinn
>
> Blue Mountains, Australia
>
>
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