Amperage Of A Fan Switch And Fan Motor

[dave205 19]

As above really?

[Simes 248 2 Cars]

Depends what fan?

 

Easiest way to find out for yourself is to measure the current with a multimeter.

Another way would be to look in the shunt box and see what fuse is in there for the fan.

I've just bought a new fan and it draws around 7A the fan switch is the thermistor in the rad.

If you're considering a switch for manual override, use a relay. Then you can switch at a lower voltage.

[BlueBolt 156]

I'll second the use of a relay, if that is your plan, after melting 2 or 3 switches myself using a live feed for it previously...

[Anthony 1,003]

Easiest way to find out for yourself is to measure the current with a multimeter.

Be careful with this, as multimeters will only handle so much current and a radiator fan may pull enough to risk damage (or at least popping the internal fuse) depending on the fan type and what the multimeter is rated to.

[welshpug 1,657]

standard fan is 230 watts,

 

bit of googling digs this up:

 

The mathematical formula for this product is volts (v) times amperes (i) is equal to watts (w) or (v * i = w). Applying algebra to this formula for finding amperage is equal to watts divided by voltage or ( i = w / v)

Read more: How to Calculate Amperage Draw | eHow.com http://www.ehow.com/how_5328646_calculate-amperage-draw.html#ixzz1nFhNNjs3

 

 

so 230/12=19.16 amps.

 

more realistic running voltage is nearer 14, so 230/14=16 amps.

[Rippthrough 98]

They can draw a lot more inrush current on startup too.

[dch1950 37 1 Cars]

The maximum current draw (at start up) is as calculated above. Once the motor gets to speed the generator effect comes in to play and the applied voltage is reduced which for a constant (coil) resistance lowers the operating current draw.

Dave

[dave205 19]

The fan im going to fot is 80w/12v so approx 6.6 amps, the original fan is fused at 30amp is it just a case of changing the fuse? The fan switch however is not fuse'd so im not entirely sure what to do with it? I want to run a single fan with out the twin speed relays, and seen as the new fan draws less amps hopefully i wont have to run a relay to switch it.

 

Help and ideas?

[dave205 19]

Also does any one know what cable goes on to the fan switch on a 1600 gti? What colour plug and cables is it?

 

Also does any one know what cable goes on to the fan switch on a 1600 gti? What colour plug and cables is it?