If i jump terminals A and E on the fan relay with a toggle switch will i fry something? Or is that all the relay connects to create the circuit? I have looked everywhere for the fan switch but i cant find it. isnt it by the starter or am i looking in the wrong place? Thanks

------------------
85 Z/28 TPI
Mods: Flowmaster's,Cam,Hypertech Chip

[This message has been edited by Platinum (edited July 27, 2000).]

 

Yes, those are the contacts ("A" and "E") to turn "on" the fan on my '91 camaro.

That's a good way to test the fans (engine can be "on" or "off"). Remove the relay from the socket, and jumper terminals "A" and "E" (note that the only two heavy guage wires are connected to these terminals).

FYI, terminal "E" is +12 all the time via a fusible link. Terminal "A" goes to the fan positive motor.

If you use a toggle switch, ensure it's rated for at least 15-20 amperes (there is over 20 amperes at motor start-up, which is reduced to about 12 amperes at operating speed).

Question - why not just put your switch on the relay coil side? That way, you could use a small switch since it only has to switch less than an ampere (100-200 mA (milliampere))???

[This message has been edited by Stuart Moss (edited July 27, 2000).]

 

So if i run a toggle switch between the 2 will it be ok?

------------------
85 Z/28
Mods: Flowmaster's,Cam,Hypertech Chip

 

Well, "yes", but with a warning.

Because you'll be switching the full current of the fan (12-20+ amperes), you must ensure that your switch will be able to handle it. I would think a minimum rating of 20 amperes.

If you use a lower rating, it may work, but will only be a matter of time before it fails. Because of the high in-rush current of the fans (over 20 amps on my 91 Camaro), even a switch rated for 20 amperes may not be enough.

Why not just switch the fans by grounding the coil of the relay? Grounding terminal "F" will energize the relay coil (terminal "D" is hot with ignition "ON" or "RUN").

I'd use 12 guage wires if you do switch the fans directly.

 

AAGGHHH!!! Just run the green and white wire to ground. Put a switch on that and run whatever dern switch you want. It works great and you ony have to run 16-18 ga. wire instead of your heavy stuff that it will take hold 20 amps. This isn't rocket science here people, and if you would have checked the archives you would have see this .

Lars

------------------
'92 RS 305 TBI
K&N Open Element
Ultimate TBI mod's (thanks Pablo)
Cam[.442"/.465" x 218*/224* @ .050", 10:1 Hypereutectic Pistons
Performer Manifold
Shift Kit, Corvette servo,
and 2800 Stall Trans Specialties Converter,
Gutted Cat, IAT Resistor
MSD Blaster Coil, Accel Cap and Rotor

 

no, it doesnt work for me!!!!! I think that i kill the relay. Now, the fan always run!!!! What i did wrong?

------------------
trans-am 91 3.08 posi 5.0 lb9 5 speed stock