 Switched Positive, Switched Positive |
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| simonjb |
 Dec 24 2017, 03:01 PM
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#1
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KiwiMan  Group: Members Posts: 563 Joined: 18-October 16 From: Stamford, Connecticut Member No.: 20,505 Region Association: North East States 
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Hi
I am installing a Derale oil cooler # 15950 with a Derale fan controller # 16749. The wiring for the controller calls for a switched positive to the Yellow wire off the relay. See picture. I know my coil is a switched positive - But is there another switched positive inside the relay box in the engine bay ?, or is the coil the best option?  |
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| euro911 |
Dec 24 2017, 03:31 PM
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#2
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Retired & living the dream. God help me if I wake up! Group: Members Posts: 8,851 Joined: 2-December 06 From: So.Cal. & No.AZ (USA) Member No.: 7,300 Region Association: Southern California
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| Spoke |
Dec 24 2017, 04:32 PM
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#3
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Jerry Group: Members Posts: 6,992 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(simonjb @ Dec 24 2017, 04:01 PM)  I know my coil is a switched positive - But is there another switched positive inside the relay box in the engine bay ?, or is the coil the best option? The coil wire is the only wire accessible from either main connector. Pin 86 on the power supply relay (also pin I on the fuel injection ECU connector shown in the bottom left) is also a switched power lead. |
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| 76-914 |
Dec 24 2017, 10:31 PM
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#4
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,513 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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George, do the instructions say anything about NOT locating the fan controller in the engine compartment? MY Derale unit lasted about 2 years before it shorted out internally. It did not mention that but when I switched over to Dakota Digitals unit it was mentioned in their instructions. I feel the engine heat is what ruined my Derale unit but can't prove it. (IMG:style_emoticons/default/beerchug.gif)
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| Bartlett 914 |
Dec 26 2017, 09:42 AM
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#5
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
My oil cooler came with a thermostat. I installed the thermostat on the outlet side of the cooler and had this control the fan. I used an unswitched circuit with a series fuse. The fan will run after stopping until the temperature is lower. I put the sensor on the outlet because the oil from the engine will always be hot enough to trip the thermostat. The oil cooler will remove some heat without the fan. I let this work until the fan is needed
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| IronHillRestorations |
Dec 26 2017, 10:06 AM
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#6
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I. I. R. C. Group: Members Posts: 6,732 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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As long as you are just using the coil wire to activate a relay, that's going to be the easiest way to go.
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| simonjb |
Dec 26 2017, 10:44 AM
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#7
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KiwiMan Group: Members Posts: 563 Joined: 18-October 16 From: Stamford, Connecticut Member No.: 20,505 Region Association: North East States
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Thanks guys. I think I'll go with the coil. My unit came with a thermostat as well, but its not adjustable. So I am going with an adjustable thermostat that requires the relay etc.
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