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Join Date: May 2006
Location: Rocklin, CA
Posts: 803
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LED is on when fan is off?
I just wired my SPAL oil cooler fan to a relay and a switch in the cabin. I successfully wired the fan to turn on and off, but the LED on the switch is on when the fan is off and off when the fan is on. Shoudn't it be the other way around? There has to be a simple solution, but I'm stumped. Any ideas?
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09-09-2006, 08:01 AM
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Re: LED is on when fan is off?
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09-09-2006, 10:25 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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This situation is what I anticipated ... when I suggested in the other thread that you post a pic of the instructions on the back of the display card for that switch!
You can always operate a relay from either a ground or power signal ... but the lamp or LED in an illuminated switch almost always requires a switched power signal to correctly display the state of the operated device!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' Last edited by Early_S_Man; 09-09-2006 at 12:50 PM.. |
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09-09-2006, 12:47 PM
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Join Date: May 2006
Location: Rocklin, CA
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Early S Man. To ease your frustration, the box didn't have a schematic. However, I decided that I was just going to live with it. So, I proceeded to button everything up, which entailed disconnecting the three wires to the switch. In time, I connected the wires again and wouldn't you know it, I gave her a try and the LED light turned on when the device turned on! Maybe your right, ruf-Porsche; the wires needed to be switched and I inadvertently did!
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09-10-2006, 12:42 PM
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Throw it on the ground!
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 2,566
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Quote:
Switch Connections: "Line" - to fan relay pin #30 (common-hot) "Load" - to fan pos lead (via snap-on wire splice) "Ground" - to ground (chassis) From right to left: Line, Load & Ground (extra pigtail connectors from test wiring on initial ground wiring plan trying to get LED to work)  
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Mark 1987 911 Coupe Granite Green Metallic My Cousin's Wife's Sister's Husband is a Lawyer. |
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04-08-2007, 04:27 AM
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Join Date: May 2006
Location: Rocklin, CA
Posts: 803
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Nice work, and it looks good too! Having control over the cooler fan makes one feel more powerful.
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04-08-2007, 07:54 AM
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Throw it on the ground!
Join Date: Aug 2006
Location: Atlanta, GA
Posts: 2,566
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I do feel better having control over the fan. Interesting notes about the LED and switch location I chose.
(1) The LED is bright (very bright) consider this when choosing switch location as it may be annoying at night (2) I can see a reflection of the LED in my side mirror, WTF  (3) The potentially annoying aspects of the bright LED really should be a "non-issue" becasue (a) the fan will not be run that often and (b) it will be used mostly during the day.  Nevertheless, a very satisfying and useful project!
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Mark 1987 911 Coupe Granite Green Metallic My Cousin's Wife's Sister's Husband is a Lawyer. |
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04-08-2007, 02:28 PM
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