Guys,
I want to create a fan over-ride switch that will turn my fans on regardless of what the sensor says. How do I do this.... I am sure its very easy but how do I wire it up by the fan? Also, I was looking into a fuel cut-off switch, but I was reading about how the fuel pump's gallonage is dependant upon how much power the pump gets. I would imagine that splicing and adding a switch would reduce the current even more and bottom line it would it be better to install an ignition kill? If so what do I need to do?

 

I know you all know...... No one can help?

 

This is very easy to do, but you need a factory manual to find the correct wires. Here's how I do them on Honda's: On the back of the block (not sure where its at on a GSR, hence the need for a factory manual) there is a thermo-switch. This is the switch that turns on the fans when the engine reaches a certain temp. This works by completing the ground to the fan relay when the swith is at the proper temp.

The thermo-switch has two wires attached to it. One comes from the fan relay and the other just goes to a body ground. You want to cut the one that comes from the fan relay and splice in a new wire, while still keeping the original wire connected to itself. Think of it like a "T" fitting in a vacuum line setup.

Now, feed this newly added wire into the cockpit of the car and connect it to the switch you are going to buy. Wire the other end of the switch to a good chassis ground.

Now, every time you flip the switch, the fan will come on, and if you forget, the fan will still come on when the motor gets hot enough to trip the thermo-sensor.

 

Steve,
Thanks for the reply.. Appreciate it. I will look it up in my helms tonight. Does anyone have any ideas or thoughts about a fuel cut or kill switch?

 

You have the Helms, it's all in there. Check around the Main-FI relay (it's called that or something close.) It's where the pump is powered from. Best to put a switch on the coil side of that relay so you don't run high current through the switch.

 

You can create a kill switch for any part of you car using a similar approach. Find the relay that controls ,the fuel pump, starter, ecu, etc. and cut the ground wire to the relay. Put a swith on that ground wire, in line, and you now have a kill switch. Simple and easy.

 

I'd toggle the fan via the ECU pinout, this way you utilize the factory relay and chit, cleaner install also.

 

Yack,
Can you elaborate more? What exactly do you mean? Are you saying to splice into the ECU signal wire to the thermo switch?

 

there is a one conductor wire at the ECU (not sure the label, maybe "FAN" or something, check you helms) it's either active low or high, not sure which (need my book infront of me)

very,very low current and the install keeps the engine bay clean,etc...

 

jacks car always looks clean......it's a show car!! (that's going to roll me at summit)

 

OK I am looking at my Helms as we speak and it appears as though there is one yellow/green wire that connects to the ECT. Would I splice this wire? This seems to be the signal wire not the ground.... Can anyone help? Yack or Steve?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CXr &raquo;</TD></TR><TR><TD CLASS="quote">there is a one conductor wire at the ECU (not sure the label, maybe "FAN" or something, check you helms) it's either active low or high, not sure which (need my book infront of me)

very,very low current and the install keeps the engine bay clean,etc...</TD></TR></TABLE>

Back from the dead but I was wondering if anyone knew which color wire it is on the ecu on a 94 LS?

 

To quote the person you quoted

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">check your Helms</TD></TR></TABLE>