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 Post subject: Fan relay
PostPosted: Mon Jun 04, 2018 2:56 pm 
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Joined: Wed Feb 22, 2012 3:50 am
Posts: 21
ECU Model: No ECU
Firmware Version: 31
I am going to run my radiator fan via the ecu, but what spec of relay should I be using? Most OEM ones seem to have a diode or resister for fans. Would it be wise to do the same? at the moment I have a stock 4 pin hella 30A one, but easy enough to swap it out if it would be better to have a flyback protected one?

Is there a preferred part number for use as a fan relay?

Thanks

Ian B.


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 Post subject: Re: Fan relay
PostPosted: Mon Jun 04, 2018 5:14 pm 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2901
Location: Norn Iron
ECU Model: No ECU
Any simple automotive relay will be fine


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 Post subject: Re: Fan relay
PostPosted: Tue Jun 05, 2018 12:59 am 
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Joined: Sun May 27, 2018 3:28 pm
Posts: 23
Location: Berkshire
ECU Model: S80 Pro
Distributor: DTA Direct
Firmware Version: 73.01
usually the relay with the diode across the coil wingdings is there to protect the ecu from back emf and electrical noise in the wiring most aftermarket ecu's seem to be able to tolerate this beter than original units


molecular bob wrote:
I am going to run my radiator fan via the ecu, but what spec of relay should I be using? Most OEM ones seem to have a diode or resister for fans. Would it be wise to do the same? at the moment I have a stock 4 pin hella 30A one, but easy enough to swap it out if it would be better to have a flyback protected one?

Is there a preferred part number for use as a fan relay?

Thanks

Ian B.


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