wiring in a elec fan
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    Official RnS Addict 34 boy's Avatar
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    wiring in a elec fan

    For reasons I am going to fit an electric fan, the question I want to ask is would you wire it staight to battery through a temp controller and let it run untill it cools down when engine is switched off or run it through the ign so when engine is turned off fan will cut off.
    Thanks
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    Official RnS Addict brading's Avatar
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    IMHO I would run it through a temp controller, you would need to run it through a relay as well.

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    Official RnS Addict 34 boy's Avatar
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    Hi brading yes both ways will be through a temp controller and fused just thinking when engine turned off let the fan run on or turned off with ing.
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    I'm Not Jed Clampett stueeee's Avatar
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    I would wire it via the ignition. The 16" fan on my truck takes 25A when it's running; for the same reason it's wired via a relay so that the fan's thermo switch doesn't take the fan's electrical load.
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    Gym Junkie chrisvs's Avatar
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    I'd wire it through the ignition with a relay, if you need it to run on after switching off use a delay timer like this one:

    12 volt Timer relay. Configurable time & delay on or off.: 74205
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    Official RnS Addict brading's Avatar
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    This is how to wire it up with a relay not sure how you would add in the Timer relay though. As for a timer relay would look at a Durite 0-740-XX one think they might be cheaper.


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    Official RnS Addict stu460's Avatar
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    Unless you run an electric water pump, running on when the ignition is off won't do a great deal for the engine unless you get some syphonic flow. Better to wait while it's idling and let the fan switch off before turning the ignition off.

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    Official RnS Addict 34 boy's Avatar
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    Thanks all, yes brading thats how I was going to wire it in, the thermostat wont have a big amp draw so should be ok to wire into the ign feed, found a 70 amp relay new lying around so will use that, all other parts ordered just waitng for them to turn up.
    As I run a diymino I did not want the fan to run on after switch off have small batt as well
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    Rust Obsessive J1MMY's Avatar
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    Please excuse the hijack but I was nosing through with the intention of asking about electric fans - may I ask what engine you've got and fan/rad size?

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    Administrator blackpopracing's Avatar
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    Interested in the timer delay as I'm running mine direct from battery supply at present and it always runs for about 5 mins after parking up with around a 25A draw - not too good for the battery!
    I'd like to limit it to 60 seconds or 2 mins ideally max - is there a delay relay available for these periods?

    How would it wire in to the circuitry above?

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