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Morning,

I am trying to find the current draw that the radiator fans draw, just so I can select adequate cable.

I've measured resistance across the three fans (wired in) as I don't have an ammeter. I'm getting 1 ohm. Which gives 10amps, and 120watts  (40watts per motor) 

Can anyone confirm if this is to specification. I would look on the motors but they are buried under the car and my jack currently needs replacing....

 

Thanks

J

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If I understand this correctly you have measured 1 Ohm for all three fans? If that's so then you have measured the total resistance of 3 fans in parallel which means each fan is 3 Ohms. Assuming the a

Spitball estimate would be 5-10 amps per fan, continuous running, with brief spike well above upon starting.

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On 25/04/2020 at 10:05, woozie said:

Morning,

I am trying to find the current draw that the radiator fans draw, just so I can select adequate cable.

I've measured resistance across the three fans (wired in) as I don't have an ammeter. I'm getting 1 ohm. Which gives 10amps, and 120watts  (40watts per motor) 

Can anyone confirm if this is to specification. I would look on the motors but they are buried under the car and my jack currently needs replacing....

 

Thanks

J

Hi James,

On my car they each have a 10A fuse so the motors certainly draw less than that. Probably 5 or 6A each.

You need to use wire that is rated above your fuse rating so 15 - 20A automotive wire should be fine for each motor.

Regards, Andy.

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On 25/04/2020 at 10:05, woozie said:

Morning,

I am trying to find the current draw that the radiator fans draw, just so I can select adequate cable.

I've measured resistance across the three fans (wired in) as I don't have an ammeter. I'm getting 1 ohm. Which gives 10amps, and 120watts  (40watts per motor) 

Can anyone confirm if this is to specification. I would look on the motors but they are buried under the car and my jack currently needs replacing....

 

Thanks

J

If I understand this correctly you have measured 1 Ohm for all three fans? If that's so then you have measured the total resistance of 3 fans in parallel which means each fan is 3 Ohms. Assuming the alternator kicks out 14V then each fan would pull 4.667A (and as somebody pointed out more at start up) giving a total of 14A for the three.

Edited by Paul Coleman
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Thanks you For All for your replies. I’ve noticed they never had relays, which is what I am fitting. Yes Paul,  I've wired them parallel so taking the reciprocal gives 4amps - thanks for confirming! 

cheers all 🤗

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