zac/terry
I was reading a corolla manual and it said its thermoswitch
operation was such that continuity existed between the terminal
and body/ground below the cut in temperature, going to
discontinuous above this.
Is this the normal operation of a thermoswitch as I would have
thought it would be opposite? Anyway for safety this corolla switch
allows the thermofan to automatically remain on if anything
happens to the wiring (eg switch disconnected, wiring cut).
andrew
From: "Terry Rudd" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Date sent: Wed, 18 Apr 2001 01:57:49 +1000
Send reply to: [EMAIL PROTECTED]
Subject: RE: Thermostat housing L20B ZAC
> >Zac wrote:
>
> >Now I just have to work out how to wire it, does anyone know? Has two male
> >bullet connector thingos on it. I'm sure there is a factory plug for it but
> >female bullet connectors fit on it anyway.
>
>
> Zac,
>
> The wiring method for a thermo fan depends if you are going to use a relay
> to power the fan (recommended for safety).
>
> You can then wire the switch either of two ways:
>
> 1. Power to turn on circuit or
>
> 2. Ground to turn on circuit (recommended for thermo fans and most things as
> the live power wires are generally much shorter and very rarely go through
> the firewall).
>
> I modify the "ground to turn on circuit" shown if you want the thermo fan to
> only come on when the ignition is on. Instead of wiring battery power to Pin
> 86, wire an ignition ON feed from the BR or similar instead. Battery power
> still goes direct to Pin 30 as that's actually the main power (read amperage
> so install an inline 20 amp fuse in this wire) feed to the relay. Your Temp
> switch goes exactly where the switch is shown in the diagram and if you wish
> to have a light come on inside the car when the fan is running, connect 12v
> power (preferably a fused source for safety) to one side of the light and
> then from the other side run a wire to the Temp switch to the same side that
> is connected to Pin 85, so when the switch kicks in the light comes on as it
> gets earthed via the switch at the same time as the relay fires.
>
> This is the safe way to wire a thermo fan ON indicator light inside the car
> as if for some reason the wire going through the firewall shorts it doesn't
> rain sparks, only the light turns on and the fan will run also as it shares
> the earth with the light, but no real harm will be done as there is no
> amperage drawn in these wires.
>
> Note. The pilot light is wired exactly the same way even if you use battery
> sense at Pin 86.
>
> I found this website that has a diagram of both methods and also shows the
> guts of a Bosch mini relay.
>
> Have a read and ask questions.
>
> http://www.classictruckshop.com/clubs/earlyburbs/projects/bosch/relay.htm
>
> regards,
>
> Terry
>
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