coozer
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 posted on 17/2/07 at 09:42 PM |
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Fan Circuit.
Anyone got a wiring diagram for a fan circuit? Obviously has to stay on after the ignition is off and I would like to put an override switch in.
Diagram, relay needed? fuse size? etc etc..
Cheers,
Steve
1972 V8 Jago
1980 Z750
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rusty nuts
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| posted on 17/2/07 at 09:51 PM |
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For what they cost fit a relay, easy to fit an over ride switch to operate relay although you shopuldn't need one . Fan switches are available
in loads of temperature ranges
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stevec
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| posted on 17/2/07 at 10:36 PM |
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Its not a very good sketch but I did mine like this with a 40 amp relay and a 15 amp fuse.
Fuse may be better after relay, any suggestions anyone?
[Edited on 17/2/07 by stevec]
 
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wilkingj
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| posted on 18/2/07 at 09:11 AM |
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quote:
Originally posted by rusty nuts
For what they cost fit a relay, easy to fit an over ride switch to operate relay although you shopuldn't need one . Fan switches are available
in loads of temperature ranges
Its always best to fit a relay. The start-up current on an inductive motor shuch as a fan is very high for a split second or so.
Also if you didnt use a relay, you would want a serious switch on the dashboard that would also be able to take the full current of the Fan motor
including the start up current.
Just my 2d worth
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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coozer
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| posted on 18/2/07 at 10:36 AM |
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Thanks guys. I'll get cracking on that one...
1972 V8 Jago
1980 Z750
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wilkingj
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| posted on 18/2/07 at 01:05 PM |
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quote:
Originally posted by stevec
Fuse may be better after relay, any suggestions anyone?
[Edited on 17/2/07 by stevec]
Always fuse the live side / feed. I would put the fuse in the feed as per your diagram.
It prevents any problem if the relay goes faulty inside and shorts out etc. I know thats a bit unlikely, but tis the principle of fusing the feeds to
devices.
Also make sure the wiring can take the current. In you diagram the feed powers the relay (negligble current) and the Fan, (significant current). No
problem with wiring that way, but make sure all wires are suitable for the current in that part of the circuit.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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stevec
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| posted on 18/2/07 at 01:52 PM |
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wilkingj. Thanks for the confirmation.
The fuse on mine is as the diagram and the wiring is more than man enough for the job.
The wire to pin 30 is heavy duty with a light duty bridge to pin 85. And heavy to the fan.
I just had one of those doubting moments last night when I posted the reply,
Stella Artois syndrome I think
Cheers.
Steve.
[Edited on 18/2/07 by stevec]
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designer
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| posted on 18/2/07 at 11:16 PM |
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Why bother with an override switch?
Wire the fan through a permentant supplied fuse and leave the rest to the radiator switch.
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bob
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| posted on 18/2/07 at 11:33 PM |
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Override switch
Sometimes its nice to get the fan on early in traffic during the summer months especially if using older engines which had a permanent fan running on
a belt originally.
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