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dgsaz
Samba Member
Joined: November 04, 2008
Posts: 584
Location: Phoenix / San Diego
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 Posted: Wed Sep 04, 2013 1:01 pm Post subject: Wiring Diagram for Oil Cooler Fan |
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Hello all,
Would you have a look at my wiring diagram for an oil cooler fan with a relay and an in-line thermostat switch.
As my oil temp has yet to go much over 180 degrees I'm not sure if it's wired right or it has never gotten hot enough to turn on the fan.
I'm thinking about hitting the t-stat switch with a hot air gun and see if that will cause the fan and indicator light to come on. Then on the other hand it could be wired wrong.
Here's how I have it wired now. Right or wrong, or just not hot enough yet?
Thanks for looking.
dgsaz
[img][/img] |
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risk
Samba Member
Joined: June 24, 2004
Posts: 724
Location: Stumpbroke, Arkansas
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| Posted: Wed Sep 04, 2013 1:16 pm Post subject: |
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| 85 should be ground and 86 is trigger from your thermostat... try it that way and I bet the fan comes on. |
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dgsaz
Samba Member
Joined: November 04, 2008
Posts: 584
Location: Phoenix / San Diego
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risk
Samba Member
Joined: June 24, 2004
Posts: 724
Location: Stumpbroke, Arkansas
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| Posted: Wed Sep 04, 2013 3:16 pm Post subject: |
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| There are a few different ways to wire it up depending on how you are using it.. for your application I think you need to swap 85 & 86. |
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[email protected]
Samba Member
Joined: May 17, 2003
Posts: 4874
Location: Harmony, PA
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| Posted: Wed Sep 04, 2013 3:40 pm Post subject: |
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| Something else to consider is adding a diode to the warning light from your alternator. If the cooling fan is running when you go to shut off the engine, the fan blades spinning to a stop can cause feedback into the charging system. MSD recomends using a 1 amp, 100 volt diode. I think the Radio Shack part # is 276-1103. Just wire it inline of the wire between the alternator, and charging light. The diode should have a stripe on it, and the stripe end goes to the alternator. Another thing to consider is running the thermostat after the cooler, so the cooler has an opportunity to cool some without the fan. |
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bsairhead
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Joined: October 08, 2008
Posts: 4465
Location: viroqua wi.
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| Posted: Wed Sep 04, 2013 3:42 pm Post subject: |
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| 85 is the ground. Edit, Or 86, should not matter |
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dgsaz
Samba Member
Joined: November 04, 2008
Posts: 584
Location: Phoenix / San Diego
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| Posted: Wed Sep 04, 2013 4:10 pm Post subject: |
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| risk wrote: |
| There are a few different ways to wire it up depending on how you are using it.. for your application I think you need to swap 85 & 86. |
Thanks for the answers. I'll try it and report back.
dgsaz |
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risk
Samba Member
Joined: June 24, 2004
Posts: 724
Location: Stumpbroke, Arkansas
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| Posted: Wed Sep 04, 2013 4:58 pm Post subject: |
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| bsairhead wrote: |
| 85 is the ground. Edit, Or 86, should not matter |
Yeah I guess it could go either way.. I have always wired them the same way, 85 to ground and never had an issue. |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20799
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Wed Sep 04, 2013 9:42 pm Post subject: |
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Should work either way unless there is a diode across internal coil of relay..... The relay is just a electromagnetic switch and in most cases does not care what polarity is on 85/86...
But the correct way is...
85 ground
86 12 volts
87 Output
30 + 12 volts input...
http://www.motor.com/magazine/pdfs/042003_07.pdf
To test total circuit, just take a jumper wire and go across the two terminals of t-stat switch, fan should start up.......
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
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Last edited by Dale M. on Wed Sep 04, 2013 9:51 pm; edited 2 times in total |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20799
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Wed Sep 04, 2013 9:48 pm Post subject: |
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| [email protected] wrote: |
| Something else to consider is adding a diode to the warning light from your alternator. If the cooling fan is running when you go to shut off the engine, the fan blades spinning to a stop can cause feedback into the charging system. MSD recomends using a 1 amp, 100 volt diode. I think the Radio Shack part # is 276-1103. Just wire it inline of the wire between the alternator, and charging light. The diode should have a stripe on it, and the stripe end goes to the alternator. Another thing to consider is running the thermostat after the cooler, so the cooler has an opportunity to cool some without the fan. |
Fan is not going to generate enough electricity to keep engine running.... Besides, if wired correctly relay coil 12 volts should be sourced by ignition switch and once key is off, relay contacts "open" and there is no electrical path from fan motor to possibly cause run on condition...
Diode that MSD supplies and shows in its diagrams do nothing to stop run on unless there is a malfunction in MSD box and it puts out a voltage on IGN (control off-on) wire.... Which under normal circumstances it should not do....
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ...
Last edited by Dale M. on Thu Sep 05, 2013 4:29 am; edited 1 time in total |
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jason
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Joined: August 07, 2002
Posts: 3462
Location: Garage
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| Posted: Wed Sep 04, 2013 10:10 pm Post subject: |
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| I do mine backwards, do all the triggering with the ground legs and the fan will stay on after the car is turned off. |
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jason
Samba Member
Joined: August 07, 2002
Posts: 3462
Location: Garage
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| Posted: Wed Sep 04, 2013 10:16 pm Post subject: |
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| My fan usually only comes on after shutting the motor off. I think it has something to do with the motor not blowing the air to cool. It's usually only a minute or two. |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20799
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Thu Sep 05, 2013 4:33 am Post subject: |
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IF fan is running after car shuts off, its because of two things, temperature rise at t-stat because oil is no longer flowing and not cooling t-stat and control circuit for fan (relay) is not wired for control by key switch, its wired direct to battery which is not necessary or desirable...
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20799
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Thu Sep 05, 2013 4:45 am Post subject: Re: Wiring Diagram for Oil Cooler Fan |
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| dgsaz wrote: |
Hello all,
Would you have a look at my wiring diagram for an oil cooler fan with a relay and an in-line thermostat switch.
As my oil temp has yet to go much over 180 degrees I'm not sure if it's wired right or it has never gotten hot enough to turn on the fan.
I'm thinking about hitting the t-stat switch with a hot air gun and see if that will cause the fan and indicator light to come on. Then on the other hand it could be wired wrong.
Here's how I have it wired now. Right or wrong, or just not hot enough yet?
Thanks for looking.
dgsaz
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Actually T-stat should be on out put side of cooler.... IF cooler is doing its job of cooling oil with out fan running then t-stat does not need to trigger fan into coming on by temperature of hot oil coming into cooler, fan only needs to run if COOLER is not capable of cooling oil to below t-stat temp because there is not enough ambient temp change in cooling coil of cooler by natural air flow through cooler IE: cooler buried someplace deep in vehicle where there is no natural air flow.......
And as I mentioned above, control circuit should be under ignition switch control, there is no reason for fan to run if oil is not flowing through cooler...
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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jason
Samba Member
Joined: August 07, 2002
Posts: 3462
Location: Garage
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| Posted: Thu Sep 05, 2013 8:37 am Post subject: |
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| Dale you are correct, key does not not actuate fan. I prefer not having extra hot wires all over. I also don't see a problem with the fan on after the car is off, my new car does it. |
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jason
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Joined: August 07, 2002
Posts: 3462
Location: Garage
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| Posted: Thu Sep 05, 2013 8:39 am Post subject: |
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| Also make sure your fuse is as close as possible to the battery. |
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Dale M.
Samba Member
Joined: April 12, 2006
Posts: 20799
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Thu Sep 05, 2013 12:30 pm Post subject: |
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| jason wrote: |
| Dale you are correct, key does not not actuate fan. I prefer not having extra hot wires all over. I also don't see a problem with the fan on after the car is off, my new car does it. |
And the cooling fan conversion I put on my JEEP specifically has relay (fan) controlled with ignition switch..... Go Figure....
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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mondshine
Samba Member
Joined: October 27, 2006
Posts: 2812
Location: The World's Motor Capital
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| Posted: Thu Sep 05, 2013 4:41 pm Post subject: |
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Try this:
Good luck, Mondshine |
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dgsaz
Samba Member
Joined: November 04, 2008
Posts: 584
Location: Phoenix / San Diego
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| Posted: Wed Sep 11, 2013 4:52 pm Post subject: |
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| risk wrote: |
| 85 should be ground and 86 is trigger from your thermostat... try it that way and I bet the fan comes on. |
Ok, I finally got around to troubleshooting the wiring. When I split the relay and took a good look at the internals I realized that the ground from the 86 terminal was run to the thermo switch and the 85 terminal was running to ground.
If I would have followed my own diagram it would have worked, but noooo....
I write this off to the mirror image when the relay is split. Right is left and left is right. That and I'm a part time dyslectic just a pinch of adult ADD.
Tested the new set up with a jumper at the thermo switch and both the fan and indicator light work.
Now all I need is a good blast up the I-5 and see what happens when I pass 180 degrees.
Better late that never.
dgsaz |
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Ellis' Bug
Samba Member
Joined: November 15, 2006
Posts: 650
Location: Phoenix
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| Posted: Thu Sep 12, 2013 1:35 pm Post subject: |
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Sorry guys but I'm a little electrically challenged. I have one side of the t-stat grounded..... and my fan isn't coming on.
Can someone re-do the drawing above so that it is correct...... or is it already correct?
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