OK, so while sitting at work today, when I'm about 5 days away from taking off for school, I've gotten to thinking about to best way to wire up my AUX fan.
Here's what I had originally planned:
I purchased a 30A relay, bunch of 18ga wire, little switch and a red LED. I was going to wire in my relay, using the switch and the low temp setting on the radiator switch, and make it simple - in-line fuse, etc etc. Well, I thought, why not reuse the car's fuses and relays already there, right? Just tap into the current wires.
Something I've thought of is a way to still use the stock relays for the stock AUX fan. even though mine is not stock, it can still run off of the same circuit, I think. By that, I mean run off of the temp switch and everything, while I wire in my own switch that will override the temp switch and run high no matter what.
Basically, there would be no need for my RadioShack relay, since I would use the car's relays to run my fan.
So, here's what I'm thinking now:
First, I'll wire my fan up to the stock car's wiring harness. For the full-speed voltage lead, I'll just send it into the 12v for the fan. For the low speed voltage lead, I'll use the resistor from the stock AUX fan, and then tap into the 12v for the fan. This would make it run slower - correct?
At this point, it should run like the stock AUX fan did - low speed at 91 C and high speed at 99 C, whilst utilitizing the stock 15A and 30A fuses and respective relays for low and high. Now on top of this, I would like to wire in a single rocker switch that will turn the fan on high no matter what. To do this, couldn't I just tap into the high-speed switch wire from the TEMP switch - this would click on the high speed relay and run the fan at high. What happens if the temp switch turns on the low speed relay. Will that really matter? Since electricity follows the path of least resistance, won't the slower-speed circuit (since it has that inline resistor) pretty much be ignored, even though it'd be on? It couldn't blow the fuse since the resister is there, correct?
Now, for my LED, I'd like it to turn on whenever the fan is on. Don't care if it's the switch or automatically - I want it on when the fan is on. I may wire it to the low speed and high speed individually to notify me when it's on high or low. Can you put a resister in line to an LED and run it dimmer - or will the LED just not light up? To get my LED to light up, couldn't I just run a wire from the 12v into the fan? Even though the fan may pull up to 30A, that shouldn't matter for the LED, right? It won't be pulling that current to the LED, correct?
Also - a question regarding the temp switch. This acts as a switch, correct? What I mean by that is, there's 12v going into the switch, then, dpending on the temp, the temp switch will send the 12v to either the low speed relay or the high speed relay. In my case, if the switch it on, the high speed relay will remain on - and that shouldn't cause an issue if the low speed relay switches on too, right?
I know this is probably REALLY confusing. But basically, here's what I need to know:
1. How do I wire my own switch into the stock AUX fan setup to run high all the time (even if the fan switch wants to run the fan on low_. When off - it should act as if there's nothing there - and run low/high respectively.
2. Can I tap the 12v line going into the fan to light up my LED to show me when the fan is running?
3. Does the temp switch operate by sending 12 volts to either the low or high speed relays?
So...does this make a whole lot of sense to anyone? lol
Let me know what you all think!
By the way - for those wondering, I got a 16in electric fan with curved blades for about $60 shipped off ebay about a year ago. Unsure of brand, but pretty sure it moves at least 2500 CFM, maybe even 3000.
Here's what I had originally planned:
I purchased a 30A relay, bunch of 18ga wire, little switch and a red LED. I was going to wire in my relay, using the switch and the low temp setting on the radiator switch, and make it simple - in-line fuse, etc etc. Well, I thought, why not reuse the car's fuses and relays already there, right? Just tap into the current wires.
Something I've thought of is a way to still use the stock relays for the stock AUX fan. even though mine is not stock, it can still run off of the same circuit, I think. By that, I mean run off of the temp switch and everything, while I wire in my own switch that will override the temp switch and run high no matter what.
Basically, there would be no need for my RadioShack relay, since I would use the car's relays to run my fan.
So, here's what I'm thinking now:
First, I'll wire my fan up to the stock car's wiring harness. For the full-speed voltage lead, I'll just send it into the 12v for the fan. For the low speed voltage lead, I'll use the resistor from the stock AUX fan, and then tap into the 12v for the fan. This would make it run slower - correct?
At this point, it should run like the stock AUX fan did - low speed at 91 C and high speed at 99 C, whilst utilitizing the stock 15A and 30A fuses and respective relays for low and high. Now on top of this, I would like to wire in a single rocker switch that will turn the fan on high no matter what. To do this, couldn't I just tap into the high-speed switch wire from the TEMP switch - this would click on the high speed relay and run the fan at high. What happens if the temp switch turns on the low speed relay. Will that really matter? Since electricity follows the path of least resistance, won't the slower-speed circuit (since it has that inline resistor) pretty much be ignored, even though it'd be on? It couldn't blow the fuse since the resister is there, correct?
Now, for my LED, I'd like it to turn on whenever the fan is on. Don't care if it's the switch or automatically - I want it on when the fan is on. I may wire it to the low speed and high speed individually to notify me when it's on high or low. Can you put a resister in line to an LED and run it dimmer - or will the LED just not light up? To get my LED to light up, couldn't I just run a wire from the 12v into the fan? Even though the fan may pull up to 30A, that shouldn't matter for the LED, right? It won't be pulling that current to the LED, correct?
Also - a question regarding the temp switch. This acts as a switch, correct? What I mean by that is, there's 12v going into the switch, then, dpending on the temp, the temp switch will send the 12v to either the low speed relay or the high speed relay. In my case, if the switch it on, the high speed relay will remain on - and that shouldn't cause an issue if the low speed relay switches on too, right?
I know this is probably REALLY confusing. But basically, here's what I need to know:
1. How do I wire my own switch into the stock AUX fan setup to run high all the time (even if the fan switch wants to run the fan on low_. When off - it should act as if there's nothing there - and run low/high respectively.
2. Can I tap the 12v line going into the fan to light up my LED to show me when the fan is running?
3. Does the temp switch operate by sending 12 volts to either the low or high speed relays?
So...does this make a whole lot of sense to anyone? lol
Let me know what you all think!
By the way - for those wondering, I got a 16in electric fan with curved blades for about $60 shipped off ebay about a year ago. Unsure of brand, but pretty sure it moves at least 2500 CFM, maybe even 3000.
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