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THINGONER
Samba Member
Joined: April 13, 2008
Posts: 674
Location: riverside ca
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 Posted: Mon Sep 09, 2013 12:54 pm Post subject: Oil cooler fan power supply |
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| Is it ok to run a power wire to my oil cooler fan from the positive side of my coil or is this a bad idea? I would be using an inline fuse-thank you. |
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jfats808
Samba Member
Joined: December 10, 2007
Posts: 5022
Location: oahu hawaii
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| Posted: Mon Sep 09, 2013 1:13 pm Post subject: |
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Its a switched 12v power line from ignition. Since you are putting on an inline fuse, your good to go. I have hooked up fuel pumps to that same service line. No ill effects.
I installed an ext 6 position fuse block for extra electronics, radio, amps, gauges, etc. If you intend to do the same, might be a good idea to put one in.
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Check your oil levels routinely! |
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THINGONER
Samba Member
Joined: April 13, 2008
Posts: 674
Location: riverside ca
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| Posted: Mon Sep 09, 2013 1:20 pm Post subject: |
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| Ok great news thank you for replying! |
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Northof49
Samba Member
Joined: July 22, 2013
Posts: 1759
Location: Winnipeg, Manitoba, Canada
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| Posted: Mon Sep 09, 2013 1:47 pm Post subject: |
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Any idea how many amps the oil cooler fan draws? Perhaps it should have a heavier gauge wire direct to the battery and a relay if you want it off when ignition is off.
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SRP1
Samba Member
Joined: January 06, 2007
Posts: 4340
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| Posted: Mon Sep 09, 2013 2:13 pm Post subject: Re: Oil cooler fan power supply |
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| THINGONER wrote: |
| Is it ok to run a power wire to my oil cooler fan from the positive side of my coil or is this a bad idea? I would be using an inline fuse-thank you. |
NO....Not a good idea. You will not have enough current to operate both the fan and the ignition. The voltage drop on that line over such a long distance is bad enough as it is, it's just barely enough juice to power the stock ignition and that's it. On top of that the fan can act like an alternator as it spins down, it will back feed the coil and the engine will remain running until the fan comes to a stop unless you install a diode.
The way to wire your fan is to install a fan relay with diode (anywhere near the fan is good) and use a wire from the coil + switched on lead to the relay to activate the relay. All main line power comes directly from the battery and goes directly to the this way (fuses as needed of course). The minimal amount of power needed to activate the relay will not effect the ignition power. |
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THINGONER
Samba Member
Joined: April 13, 2008
Posts: 674
Location: riverside ca
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| Posted: Mon Sep 09, 2013 2:51 pm Post subject: |
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| Ok so instead of going directly to fan run that same power wire from coil to a relay and then power fan from relay-does the relay require more than one power wire? Also where would I purchase this relay?-thank you |
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rays-64
Samba Member
Joined: April 02, 2010
Posts: 343
Location: corona, CA
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| Posted: Mon Sep 09, 2013 3:34 pm Post subject: |
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| I have my fan wired directly to the starter extra terminal with a fuss. The fan does stay running for a couple of minutes after ignition is turned off. |
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SRP1
Samba Member
Joined: January 06, 2007
Posts: 4340
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| Posted: Mon Sep 09, 2013 8:48 pm Post subject: |
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| THINGONER wrote: |
| Ok so instead of going directly to fan run that same power wire from coil to a relay and then power fan from relay-does the relay require more than one power wire? Also where would I purchase this relay?-thank you |
A fused power wire will go directly from the battery to the relay then on to the fan. The relay is nothing more than a high amp switch. The wire from the coil simply triggers the relay which takes very little power to do. Once triggered power travels through the relay and onto the fan. This way the load does not go through your vehicles wiring which is not capable of supporting that type of amperage draw.
Here is a diagram from this site off of a different thread.
The relay is a universal 12 volt 30 amp relay, looks like a black ice cube and.they come in 4 or 5 prong. Does not matter which one you get there both the same in your case. They are available at most any auto parts store. Just ask the counterman for a 12volt 30 amp.relay, you want the one with the mounting tab. If he looks at you like you speak a foreign language just ask for the manager, this is a very common part. A quick search on google.will give you dozens of.sources.
Here's one, but again local parts store is the easiest.
http://m.delcity.net/store/Relay-&-Socket-Harness-Kit/p_72563 |
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THINGONER
Samba Member
Joined: April 13, 2008
Posts: 674
Location: riverside ca
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| Posted: Mon Sep 09, 2013 10:26 pm Post subject: |
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| Ok-thank you! |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20380
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Tue Sep 10, 2013 7:09 am Post subject: Re: Oil cooler fan power supply |
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| SRP1 wrote: |
| THINGONER wrote: |
| Is it ok to run a power wire to my oil cooler fan from the positive side of my coil or is this a bad idea? I would be using an inline fuse-thank you. |
NO....Not a good idea. You will not have enough current to operate both the fan and the ignition. The voltage drop on that line over such a long distance is bad enough as it is, it's just barely enough juice to power the stock ignition and that's it. On top of that the fan can act like an alternator as it spins down, it will back feed the coil and the engine will remain running until the fan comes to a stop unless you install a diode.
The way to wire your fan is to install a fan relay with diode (anywhere near the fan is good) and use a wire from the coil + switched on lead to the relay to activate the relay. All main line power comes directly from the battery and goes directly to the this way (fuses as needed of course). The minimal amount of power needed to activate the relay will not effect the ignition power. |
Ditto....
And wire per sketch....
Dale
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woodoctr
Samba Member
Joined: June 01, 2013
Posts: 254
Location: Ohio
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| Posted: Tue Sep 10, 2013 9:21 pm Post subject: |
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| Yep, that drawing is the same way my rotary conversion is set-up with my oil cooler. I also incorporated an adjustable fan switch so I could control my on and off temp.s. It's the type that uses a probe through the fins. Working with a non-contact laser probe I was really able to fine tune when that fan comes on and off. |
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