 12 volt source for cooler fan, where to tie in power |
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| simonr |
 Jun 28 2011, 04:18 PM
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#1
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Member  Group: Members Posts: 65 Joined: 11-July 10 From: Indianapolis Indiana Member No.: 11,925 Region Association: None  |
Just installed a fan equipped oil cooler. I need to power the fan with an ignition switched 12 volt power source. Where is the best place to do that? Thanks for the help. Im hopefully looking forward to cooler temps
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| Mike Bellis |
Jun 28 2011, 04:46 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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add a relay powered from the battery and use the coil + to switch it on/off.
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| simonr |
Jun 28 2011, 04:50 PM
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#3
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Member Group: Members Posts: 65 Joined: 11-July 10 From: Indianapolis Indiana Member No.: 11,925 Region Association: None |
I just want to find a wire to patch into
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| Cap'n Krusty |
Jun 28 2011, 05:12 PM
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#4
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Like somebody already said, hot from the battery to a relay, trigger from the coil. Ground it through the thermoswitch you installed in the oil line so the cooler only runs when you need it. Don't want to EVER overcool the oil.
The Cap'n |
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| Series9 |
Jun 28 2011, 06:22 PM
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#5
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Lesbians taste like chicken. Group: Members Posts: 5,444 Joined: 22-August 04 From: DeLand, FL Member No.: 2,602 Region Association: South East States |
First, where is the cooler installed? How about a picture?
Second, is there an oil thermostat installed? |
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| yeahmag |
Jun 28 2011, 06:22 PM
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#6
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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My fan is low enough amps that I tied in to the fuel pump with a thermostat inline to trigger it.
Like this: http://www.etrailer.com/Radiator-Fans/Derale/D35022.html |
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| Mike Bellis |
Jun 28 2011, 06:46 PM
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#7
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
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There is no circuit on a 914 that can handle the extra load from a fan. I'm assuming your fan draws 5 amps or more. Install a relay and be done.
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| simonr |
Jun 28 2011, 07:22 PM
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#8
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Member Group: Members Posts: 65 Joined: 11-July 10 From: Indianapolis Indiana Member No.: 11,925 Region Association: None |
Relay it is !!
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| simonr |
Jun 28 2011, 07:22 PM
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#9
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Member Group: Members Posts: 65 Joined: 11-July 10 From: Indianapolis Indiana Member No.: 11,925 Region Association: None |
what is the type of relay I should use. Im new to relays
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| Mike Bellis |
Jun 28 2011, 07:28 PM
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#10
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
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| simonr |
Jun 29 2011, 05:02 PM
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#11
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Member Group: Members Posts: 65 Joined: 11-July 10 From: Indianapolis Indiana Member No.: 11,925 Region Association: None |
I got everything wired up but only can find a 12v 30 amp relay . the thermoswitch says it has a 15 amp max continuous. can I still use this relay. It seems all the relays a 30 amp I cant find a 15 anywhere
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| Jeffs9146 |
Jun 29 2011, 05:08 PM
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#12
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Ski Bum Group: Members Posts: 4,062 Joined: 10-January 03 From: Discovery Bay, Ca Member No.: 128 |
Thats MAX amps it will work fine as long as the source is properly fused!
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| Cap'n Krusty |
Jun 29 2011, 05:09 PM
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#13
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
That's "capacity", meaning you can us "up to" 12V-30A pretty safely. I use 40A for most applications, cause they're readily available from Bosch and other VW/Audi and Porsche parts suppliers.
The Cap'n |
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| ArtechnikA |
Jun 29 2011, 07:58 PM
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#14
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
I bought one of these: ThermoSwitch Relay for a non-Porsche application.
The thermoswitch is adjustable, the relay is 40A, it has output leads for two fans, and includes the remote thermo sensor. Price is right. It also includes an 'override' lead that's traditionally wired to an AC clutch but can be used for anything you like. |
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| iamchappy |
Jun 29 2011, 08:14 PM
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#15
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It all happens so fast! Group: Members Posts: 4,893 Joined: 5-November 03 From: minnetonka, mn Member No.: 1,315 Region Association: Upper MidWest |
I ran my oil cooler thermostat from unswitched relayed power, that way it will run on after the car is turned off until it is cooled, usually only takes a minute or so.
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| SLITS |
Jun 29 2011, 08:18 PM
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#16
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
(IMG:style_emoticons/default/agree.gif)
I run mine thru a thermostat controlled, fused switch directly from the battery. |
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| Drums66 |
Jun 30 2011, 11:29 AM
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#17
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
QUOTE(SLITS @ Jun 29 2011, 07:18 PM)  (IMG:style_emoticons/default/agree.gif) I run mine thru a thermostat controlled, fused switch directly from the battery. (IMG:style_emoticons/default/idea.gif) |
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