High/low speed fan control

Wiring diagrams and questions
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High/low speed fan control

Postby IMA355-2 » Wed Oct 03, 2018 3:27 pm

Hey Guys
Just a quick question
Am I right in saying that pin a8 on a vr v8 auto ecu is the high speed fan control and a6 is the low speed?
Are those outputs switching 12 v or earth ( I believe earth but wanted to double check)
Included a wiring diagram for how I intend to wire the fans in if someone could cast their eye over it.

Cheers legends :thumbup:
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Re: High/low speed fan control

Postby Holden202T » Thu Oct 04, 2018 12:38 pm

im not sure why your trying to do it with 3 relays ?

i would just run a separate relay for each fan.

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Re: High/low speed fan control

Postby immortality » Thu Oct 04, 2018 4:57 pm

I think it's that's how some of the Ford dual fans come from the factory?

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Re: High/low speed fan control

Postby IMA355-2 » Thu Oct 04, 2018 5:27 pm

Holden202t

That definately crossed my mind but they are very noisy at full speed, other option is to turn them on with the low speed control and use another temp sender for high speed control. Then they won’t automatically come on high speed with the ac fan.
I have the engine harness out of the car anyway so adding the wire in for the low speed is no worries :thumbup:

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Re: High/low speed fan control

Postby Holden202T » Mon Oct 08, 2018 1:43 pm

what are you saying you want them both come on at low speed then go faster when the high speed setting applies ?

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Re: High/low speed fan control

Postby IMA355-2 » Mon Oct 08, 2018 4:27 pm

Yeah I’ve had them in the car for ages using a couple of relays to turn on on or both but even 1 on by itself is so noisy coz it’s at full speed. I know how they are wired on fords but the Delco uses ground switching so just wanted to check that it will work whe way I’ve drawn it :thumbup:

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