dead-simple fan circuit
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dead-simple fan circuit
I've been playing with this for a while- but all the do-it-yourself fan circuits i found online were too complicated for what i needed. And there's no way I'm going to pay $150 for a fan controller.
So- here's my stab at it.
This is for a single-speed fan, in a non-A/C vehicle.
The only trick- you need the right relay.
It needs to handle enough amps to cover the fan, and either a diode or resistor built in. This one is $15.
http://www.texasindustrialelectric.com/relays_0332209138.asp
Temp senders...Summit sells these for $40. (i'm looking for a way to do this part more cheaply.) Put it in your water neck, or wherever.
Vintage Air 11190-VUS - Vintage Air Electric Fan Set-Point Temp Switches - Overview - SummitRacing.com
So- not counting the small stuff, like the in-cab single-pole switch, and the circuit breaker...this should be a perfectly functional fan control system for $55.
Input appreciated- (just don't laugh at my drawing).
So- here's my stab at it.
This is for a single-speed fan, in a non-A/C vehicle.
The only trick- you need the right relay.
It needs to handle enough amps to cover the fan, and either a diode or resistor built in. This one is $15.
http://www.texasindustrialelectric.com/relays_0332209138.asp
Temp senders...Summit sells these for $40. (i'm looking for a way to do this part more cheaply.) Put it in your water neck, or wherever.
Vintage Air 11190-VUS - Vintage Air Electric Fan Set-Point Temp Switches - Overview - SummitRacing.com
So- not counting the small stuff, like the in-cab single-pole switch, and the circuit breaker...this should be a perfectly functional fan control system for $55.
Input appreciated- (just don't laugh at my drawing).
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
Ok, why do you need the diode? Are you worried about backfeeding?
I have the same basic set up on my pickup, with just a regular relay. I don't have the manual over ride though. I run a dual fan set up, so one is using temp switch, the other fan is the "manual over ride" with just a toggle switch on the dash to operate it.
I have the same basic set up on my pickup, with just a regular relay. I don't have the manual over ride though. I run a dual fan set up, so one is using temp switch, the other fan is the "manual over ride" with just a toggle switch on the dash to operate it.
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the diode is just to prolong the life of the relay- to keep an arc from burning up the terminals when the fan switches off.
a lot of the high-amp-rated relays have them built in. i can't swear its necessary, but it seems like a good idea.
a lot of the high-amp-rated relays have them built in. i can't swear its necessary, but it seems like a good idea.
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From: Northeast LA
You can get a temp controller from Autozone for $18. This is the one I use for my low setting.
Compressor Works/Electric Fan Thermostat (733653) | AutoZone.com
Compressor Works/Electric Fan Thermostat (733653) | AutoZone.com
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You can get a temp controller from Autozone for $18. This is the one I use for my low setting.
Compressor Works/Electric Fan Thermostat (733653) | AutoZone.com
Compressor Works/Electric Fan Thermostat (733653) | AutoZone.com
very nice- if that can be used to provide ground, that'll cut the total cost down to $35. thanks!
Posting Guru
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From: Northeast LA
No problem, I've had mine in my truck for almost a year now and it works great.
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[quote=jsutton;11551015]I'm not sure if it can be wired that way or not.
/quote]
No worries- if it can only provide 12v+, the diagram could be tweaked.
Just wire pin 86 straight to ground, and move the sender & override switch over to pin 85.
/quote]
No worries- if it can only provide 12v+, the diagram could be tweaked.
Just wire pin 86 straight to ground, and move the sender & override switch over to pin 85.
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