Quick Wiring Question...

Phil W

Phil W

Phil W

Soldato
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19 Oct 2002
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Only a simple one, and probably one i could have figutred out myself, but better safe than sorry!

I'm wiring my fan in so its on a switch, so i can flick it on and off as well as it coming on automatically, the fan kicks in quite late and i prefer to be 'in control'.

So, the plug that goes into the fan motor has 2 wires on it, one black and one that is brown/white.

Am i to assume the brown;/white is positive, and the black is earth/negative?

Now, in order to make the switch work, i'm obviously going to have to put another wire in direct from the battery, where do i put this to?

Any help appreciated :)

Phil
 
Right, so i've just been and done a bit of fiddling and temporarily doen the wiring in the engine bay.

I've run 2 wires from the plug that goes into the fan, and then i put another wirre between the switch itself and the positive on the battery terminal.

The fan switches on and off on the switch now :)

A little worried about leaving it on and forgetting about it and coming back to a flat batter, any way of wiring it so it goes off when the ignition does?

Phil
 
surely its better to leave it as it is? you might be able to get some kind of dongle to make it come on earlier, I know you can on some cars.
 
Well no, not really.

The fan won't come on until the temp is nearly into the red, and it worries me at times.
 
Phil W said:
Right, so i've just been and done a bit of fiddling and temporarily doen the wiring in the engine bay.

I've run 2 wires from the plug that goes into the fan, and then i put another wirre between the switch itself and the positive on the battery terminal.

The fan switches on and off on the switch now :)

A little worried about leaving it on and forgetting about it and coming back to a flat batter, any way of wiring it so it goes off when the ignition does?

Phil
Click to expand...

Are you running the current through a relay or directly through the switch?

It is possible to wire it in with the ignition, but it isn't all that straight forward.. Ideally you'd need to connect it all up with two relays to prevent future problems.

1st relay - activated by the ignition which gives power to the 'switch' relay
2nd relay- activated by the switch which gives power to the fan.

Switches can be awfully fussy about having high current running through them
 
If it's thermostatically controlled, you'll be able to get a new sender that alters the point at which it comes on.

This is a much better way than relying on yourself turning it on and off, because, sods law, you won't notice until it's too late anyway or as you say, just come back to a flat battery :)

If it's switched it should be on a relay no question, some of these fans can draw up to 50A (yes...) on startup which is more than a lot of wiring and switching gear can support. Not tricky to wire up :)
 
After a bit of investigating, i have noticed that the car is running the 1.6 Radiator from before the Conversion, so this could also explain why its getting hotter than it should.

New plan is to replace the existing radiator for the proper 2.0 one, and also pop a new sender in whilst the new rad is accessible :)
 
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