Once the high relay is energized the high speed relay will stop the "positive switch" supply to the low fan relay, thus shutting the low fan off.....

 

The drawing is very crude at best... please save it so I can't take it off the world wide web...lol

 

Ok you can take it off the net now. ROFL I saved it, thank you. I will draw it up in Paint and see if I can clean it up a bit.

You have been a huge help, Wilde Racing. If I'm ever in your area or you're ever in MN I owe you a case a beer.

Edit: Just found new info.

 

Hmm.

Wilde Racing I just found this.

Post #45, then on.
https://ls1tech.com/forums/showthrea...=768900&page=3

 

That is another way to do it using three relays....

 

How would you do it?

 

Both do the samething.....
I would use mine... lol

 

Do you have a relay in mind? I have my Bosch 75A relay, but since I need another I can just pick up 2 of the same kind if my 75A wont work. I noticed mine does not have 87A...just 87. On high, the fan spikes above 100A and runs continuously at 33-34A so at least the high relay has to be up to snuff.

I will be back to check this in about 5 hours. Gotta drive back to school now.

 

Ya, you can always use the diagram you posted.
The heavy duty relays for number 1 and 2, and a standard relay for number 3.

 

Since when does it take 5 hours to make that drive Inch? And wow does this bring back some bad memories. I have made a fan capable of being turned on by an electric signal but bypassed the current problem and made manual adjustable speed fan by using what you would call a resistor pack (think how your HVAC in your car works.)