Installing fan relay

Dennis,

Almost. Power should go to 30, not 87a. 87a is unused. And yes, the other fan wire goes to ground.

If your existing switch completes the circuit to ground, then 85 should go to one terminal on the switch. Connect power to 86 (as well as 30).

Or you could rewire your switch so that power goes to one switch terminal and the other switch terminal goes to 86 on the relay.

John

Thanks John,

Ok, based on what you said I should:

Connect power (from battery side) to 30
Connect the switch wire to 85
Connect power to fan to 87
Relay ground to?

Per the instructions (Perma-Cool Relay)for the relay:

Connect power (from battery side) to 30 (red wire on connector)
Connect to switch to 86 (white wire on connector)
Connect power to fan to 87 (orange wire on connector)
Connect relay ground to 85 (black wire on connector)

To repeat,the switch completes the ground.


Sorry I just don't want to fry anything.

Dennis,

Connect power to 30 and 85 (fuse this wire and connect to accessory side of ignition switch)
Connect switch to 86
Connect fan wire to 87

Switch completes the circuit to ground.

John

Here's what I did:

Connect 85 to Switch used to complete circuit to ground
Connect 86 and 30 to positive power source (off ignition side)
Connect 87 to fan positive side
Connect fan negative side to ground

I followed the following diagram (ground completes circuit)



Works great.

Thanks again.

Dennis

Dennis
I love that wiring illustration..Great job!

I did mine just a little drifferent..I used two relays (one for each fan), and include a fuse-able link right off of the Poss-Battery lead...
The Prince of Darkness always finds you..

Well, my relay idea lasted about 15 minutes. I took it out for a test drive and when the car got up to temp. I through the switch and the car shut down! The gauges (cyberdyne) and the gen light would not come on, but the engine would crank. So I'm not sure what's up. I managed to get the car home...with a giggle of the ignition switch the gen and gauge lights came on and it fired.. got it home but as I pulled into the driveway bam...the ignition shut off.

I'll start looking at the ignition switch itself, but I think I have a problem with the load on the ignition circuit when the electric fans come on. My gauges would read odd values and blink when both electric fans were running. That's why I tried to add the relay to the aux electric fan controlled by a switch on the instrument panel.

Can anyone comment on this? I understand I should use relays to move the load of the fans off the circuit, can someone give me the site on how to do this?

Thanks.

quote:

can someone give me the site on how to do this?

As is so often the case, you need to go to Mike Dailey's site, www.panteraplace.com.

http://panteraplace.com/page109.htm

If you haven't yet bookmarked panteraplace, do it now.

Larry

Dennis,

There is a terminal block for the ignition switch wires above and to the right of the steering column. This is another possible problem item.

John

My problem turned out to be a bad wire connection to the aftermarket ignition switch.

I installed a new ignition switch. For the moment I've also moved the electric fans off the ignition circuit and have run them directly to the battery via a fused wire and a relay for each fan. One fan comes on using the thermostat in the radiator. The other I can control with a switch in the cockpit.

I forgot to consider the thermostat controlled fan running when the car is off while the engine is still warm, so I need to re-think this part.

Dennis,
Both of my fans are wired to run after the engine shuts down. They run for a few to 5 or 6 minutes. This has not caused me any problems. Many new cars are wired this way. Looking forward to seeing all you guys again.
Forest

I just like the idea of being able to control one of the fans at my discretion. If I get caught in traffic I can turn on the extra fan BEFORE the car gets hot.