EXACTLY how to wire fan to fuel pump relay

[240marcuSX]

I do know that there have been a ton of threads about wiring electric fans, but none that I have seen are specific enough for me.

my electric fan has a blue and black wire.

1. I connect the black wire (ground) directly to an unpainted metal surface of the frame, correct?2. I take the blue wire and splice it into the wire coming off the relay for the fuel pump, correct? By splicing, I mean stripping a little bit of the wire, and wrapping the stripped blue wire around it, and then soldering.

How exactly do I #2?Do I strip part of the wire and splice in the blue wire before or after the relay? Is my idea of splicing right?

Then I solder it up, and wrap it with something and Im done right?

Sorry that Im such an idiot about this, Ive only done minimal electrical work, most of which being cleaning up bulky harnesses that the jerk before me mangled up in my car.

Thanks alot.

[neverlift]

I personally would NEVER run a fan or anything off the fuel pump power or relay. Might just make you run lean. Your idea of soldering is about right. You should look for another power source or get an inline fuse and/or relay and a toggle switch. You dont want the fan to run constant, definately not over 55mph or highway.

[Shift_Kouki]

Its easy enough to rig an electric fan to a thermostat... that should keep the fans from running at high speed. You can also do this in stages so that the fans recive different voltage bassed on coolant temperature... but thats a tad more involved to explain and i have a cold and my head feels like baloon... but a lot of personal computer fans do this.

I dont know where i would run the power from for the fans as i have not ditched my clutch fan just yet.

Neverlift.... why is the pic in ur sig dead?-- nice pic of the front there, glad to have it back
Modified by Shift_Kouki at 4:00 PM 9/17/2006

[neverlift]

I'm apparently too stupid to do it correctly. haha yeah it just wouldnt work on day and I was like f*** it,so it never got fixed. So many interesting threads to read and whore in.

[DjPantsSpecR]

the absolute easiest way to pull this off is this:

pull the fuse from the fuel pump. now you should jumper in another fuse at this point, but you can get away with not doing this....

now with that blue wire, extend it and just wrap it around that fuse and put it back in. and like you said, ground to ground.

then after it works, get out of your car and feel the air moving. its possible to wire this thing up backwards. i run one of my cars witht he fan backwards for almost a year until it was 100 out, then it overheated a little....

the fan doesnt do anything useful over 25mph. so a thermo is the way to go, but if youre looking for piece of mind, ive run this on both 240s for more than a year. unfortunately, the fan is never my #1 priority, something else always breaks first.

and if something goes wrong in the electrical system, and by that i mean if the wire shorts out, you wont go lean. you wont go anything. the car will shut off because it will blow one of the large engine control fuses, and the car will stay on, but your motor wont.

good luck and enjoy some free'd up power. Shift_Kouki, please disregard any of this information because i dont provide useful information in threads....

[neverlift]

whats up dj

oh yeah I fixed the sig,maybe they will let me leave it this time

[S13 240SX]

the absolute easiest way to pull this off is this:

pull the fuse from the fuel pump. now you should jumper in another fuse at this point, but you can get away with not doing this....

now with that blue wire, extend it and just wrap it around that fuse and put it back in. and like you said, ground to ground.

then after it works, get out of your car and feel the air moving. its possible to wire this thing up backwards. i run one of my cars witht he fan backwards for almost a year until it was 100 out, then it overheated a little....

the fan doesnt do anything useful over 25mph. so a thermo is the way to go, but if youre looking for piece of mind, ive run this on both 240s for more than a year. unfortunately, the fan is never my #1 priority, something else always breaks first.

and if something goes wrong in the electrical system, and by that i mean if the wire shorts out, you wont go lean. you wont go anything. the car will shut off because it will blow one of the large engine control fuses, and the car will stay on, but your motor wont.

good luck and enjoy some free'd up power. Shift_Kouki, please disregard any of this information because i dont provide useful information in threads....

can you explain this with pictures please?/ cuz i need to run fans too... right now my fan is wired up to my fuel pump fuse but its making my car shuft off werid when i go to turn the key to off... like i shut my off pull the key out, but engine stays running for like 2 seconds then everything shuts off.. but it starts up noramll...

[DjPantsSpecR]

weird. and this jsut started happening after you did this?

try switching your fuse 180 degrees (so the wire is plugged into the other slot) and make sure youre not shorting anywhere. and make sure your ground is on a nice unpainted surface.

[S13 240SX]

well my fan ground wire.. i have it grouned to the raditor supoort brackets.

[neverlift]

is the ring or u terminal touching bare metal? thats what he means.

[DjPantsSpecR]

yeah, and those brackets arent bare metal. i mean take a wire brush and remove paint to get that good ground, and see if it helps at all.

[matt4pl]

go to the autoparts store, buy a thermo controler, wire it up, be done, you can adjust when the fans turn on, great if you have a varying climate like in chicago, adjust for winter/summer/track or w/e. wiring it to any stock powersource is just a bad idea because you're pulling more current through wires not rated for it. i did w write-up on installing fans the right way, its in the articels section, but its for s14 only

[edgartheace]

Dont runyour fan straight off your fuel pump, instead use the fuel pump signal to activate the a/c fan relay, so that you only sap a small amount off current from the pump to activate the fan relay, if you already cut the wires just put a relay in line with the feul pump wire, then use the relay to deliver power strait to the fan. If you use a relay from an auto parts store run a wire from the battery to pin 30, then connect the fans blue wire to pin 87, put the remaining two wires in line with the fuel pump wires. This was the set up I had on my fan before I upgraded to a temperature controlled 16" fan. Let me know if I confused you, so that I can post some pics tomorrow for you.