[Healeys] Ignition Circuit

[Michael Oritt]

Make that 7 amps--not 78....

Best--Michael Oritt


On Sun, May 26, 2019 at 4:10 PM Michael Oritt <michael.oritt at gmail.com>
wrote:

> Patrick--
>
> If, as you say, the car is always in a state of discharge when the fan is
> running I would be concerned for the state of your charging circuit.  I
> assume you have a generator if you have an ammeter and
> I believe the generators on Healeys are rated at 30 amps which should be
> more than sufficient to keep up with the draw of an auxiliary fan: the SPAL
> site rates their fans as drawing no more than 78 amps (
> https://www.a1electric.com/catalog/cat_spal.htm).
>
> Best--Michael Oritt
>
> On Sat, May 25, 2019 at 4:28 AM Kees Oudesluijs <coudesluijs at chello.nl>
> wrote:
>
>> 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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