LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

manual fan switch

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Old Mar 3, 2003 | 10:26 PM
  #16  
Prorac1's Avatar
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From: Martin Mi
i agree, i was just making sure that i wasnt losing my mind, lol. I am using the hot to activate the relay, is this dangerous? im by no means a genius, so educate me, but when i grounded the relay the way some people do i blew a fuse, so i did it this way. as long as its not dangerous, im cool with it.
Old Mar 3, 2003 | 10:30 PM
  #17  
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Originally posted by Prorac1
i agree, i was just making sure that i wasnt losing my mind, lol. I am using the hot to activate the relay, is this dangerous? im by no means a genius, so educate me, but when i grounded the relay the way some people do i blew a fuse, so i did it this way. as long as its not dangerous, im cool with it.
You are not activating the relay, you are bypassing it. That is why it is not a good idea. All the current to run the fan is going through your wiring and the switch.

If you were blowing fuses, you were doing something wrong. The wiring shown on the main page is completely benign and is only connecting ground to ground. There is no 12v involved because you are splicing into the ground wire that activates the relay.

The main reason I have heard of people using that method (the way you did it) is that it will not throw a code on OBD2 cars. The wiring diagrams on my Tech Page will accomplish the same thing, but with the safer relay activation method.

Last edited by shoebox; Mar 3, 2003 at 10:36 PM.
Old Mar 3, 2003 | 10:51 PM
  #18  
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From: Martin Mi
ok, thank you, i think i understand now, but i still dont understand where that 6 prong connector in the diagram is by the computer. I found one connector, but it had A LOT of wires in it. The first way i tried it was to tap into a diffrent blade on the relay and GROUND that one, that is when it blew the fuse. Thank you for the help, it is much appreciated, im just a little hard headed at times, lol. Thanks Prorac1
Old Mar 4, 2003 | 12:47 AM
  #19  
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It is a 10 way connector. (the upper connector in the pic)

On your 1994, it is located near the base of the RH hood support, nearer the pcm. You can use a red Scotch connector to bridge your ground wire to the wire(s) in the harness. Just protect them from the elements.
Old Mar 4, 2003 | 07:24 AM
  #20  
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im sure this is a stupid question but does this mod really help? i mean are you just wireing 1 fan to the switch and leaving the other one automatic? Or are you wireing both fans? what if you forget to turn them on one time? i know to some these are stupid questions just bare with me.
Old Mar 4, 2003 | 07:36 AM
  #21  
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Originally posted by 94droptopz
im sure this is a stupid question but does this mod really help? i mean are you just wireing 1 fan to the switch and leaving the other one automatic? Or are you wireing both fans? what if you forget to turn them on one time? i know to some these are stupid questions just bare with me.
If done correctly, it is a supplementary way to turn the fans on and does not affect norman fan operation.
Depending on the year car and how it is done it can be made to work with the key off or only when it is on. That invites a different question: "What if you forget to turn them OFF?"
Old Mar 8, 2003 | 05:50 PM
  #22  
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From: Bremerton, WA
Originally posted by ET3Partridge
Switches are not really designed to handle the inductive load of a pair of fans, it will probably work just fine the way you have it set up, with the exception of excessive current traveling back through the switch, which is a fire hazard.
Inductive load!? Please. A switch could give a flying f&#k about what type of load is downstream of it. It does care about how much current it is interrupting or supplying (as you have almost correctly stated). As far as your comment about switches not interrupting current paths.... WTF else do they do?!?!? Even if a switch is connected to a relay, it STILL is interrupting current, and the relay coil being powered is STILL an INDUCTIVE LOAD.
Originally posted by ET3Partridge
I am an Electronics Technician in the Navy, so I can field most electrical questions you guys have.
I would not claim that if I were you. You seem a little too cocky. It's doubtful you would impress many people if they knew you were still in training and have no concept of what your actual job will be. Even if you do have experience with electrical systems in cars, you didn't get it from the Navy (unless thay added it since I was in nuke A school in '98.)
Sorry if I'm being a *****, but you should think about what you write on here, don't pretend to be something you're not (yet), and try not to write stupid comments about "inductive load" just to make yourself look smarter.
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