Four wires on a cooling fan?

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=59073
Printed Date: May 13, 2025 at 7:33 PM

Topic: Four wires on a cooling fan?

Posted By: boulderguy
Subject: Four wires on a cooling fan?
Date Posted: July 08, 2005 at 1:50 PM

I have a couple fans from PartsExpress, squirrel-cage type. They have four wires each coming off them. HELP!

Red & black, that's easy. Then there's brown, which when given B+, doubles fan output.

Last there's a yellow wire, trial & error hasn't shown me what it does (no effect when given B+ or ground). Any ideas?

Model "gamma30" by Nidec, Japan.

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Replies:

Posted By: xaudiopipex
Date Posted: July 08, 2005 at 10:40 PM

does the fan still work without that wire hooked up?

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Posted By: Mad Scientists
Date Posted: July 09, 2005 at 7:12 AM

Possibly a tach lead or fan speed alarm.. I don't know that hooking up the brown wire to B+ is a good thing..<grin>

https://www.nidec.com/designoptions/options.htm#

Jim

Posted By: boulderguy
Date Posted: July 09, 2005 at 12:50 PM

Looks like the brown wire is a variable input, maybe. Haven't tested that yet. This is one of those great "what does THAT wire do" questions. I'll probably just run it on low speed, I think it's plenty. Thanks for the input.

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Posted By: swamprat323
Date Posted: July 10, 2005 at 6:03 PM

call up partexpress see if they know.

Posted By: compaq
Date Posted: July 20, 2005 at 5:59 AM

One of the other wires could be for an automatic temp sensor to turn the fan one like in most newer cars. Or for a variable resitance switch sort of like a dimmer switch. i dont know but thats the best i can come up

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