JMC:

Can you find these single throw double pole 40 amp relays anywhere?

Do they all look like this?

Does the fan controller go to the "87a" tab on both these relays?

Sorry, my wiring skills are low average at best.

 

http://www.princessauto.com/locations There are two stores in Calgary.
Every time I am in the Windsor store i pick up a few relays. The harness is included. Yes for the most part they all look like the picture. Only the Kill switch is wired to the 87a terminal. As the Troyer kit uses two controllers I ran one wire from the hot in run power source to the #30 terminal then from the 87a terminal to the two yellow wires on the fan controllers. I have edited the Kill Switch diagram to show two fan controllers. This should eliminate any confusion.

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I know where Princess Auto is. I try to avoid going there because I always come home with way more stuff than I went in looking for.

I think that clears it up for me. Thanks.

Now I am just waiting for the fans to arrive.

 

I cannot afford their tools. They are certainly cheap but the constant return trips and wasted gas to get them replaced is more expensive than buying a quality tool in the first place.

Regards

Jean Marc Chartier

 

www.parts-express.com search for 'relay', it'll come up. It's like $1.50 for a regular or $3 for a water-proof (which you may want in the engine compartment).

 

JMC:

I went to princess auto and they only have 40 amp single throw single pole relays. I even checked their website and that is all they show. Is this what you used? What is the difference between single pole and double pole?

The link kuruption posted (thanks kuruption) does indeed have the single throw double pole 40 amp relays and they are water proof but I will have to order them and pay shipping which will most likely cost 4 times what the parts do. I went to several other places around here and could not find anything.

I also assume the switches must be rated for 40 amps as well correct? All I can find around here are in the 16 amp range.

Thanks.

 

Sorry for the confusion about the relays. I didn't see that you wanted double pole relays. Princess Auto doesn't have double pole relays. May I ask why you want a double pole relay?


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I don't know what I want LOL.

I just saw you had single throw double pole 40 amp relays listed at the top of the wiring schematic you posted so that is what I was after.

So the single throw single pole relays at Princess Auto are the ones you used? I thought your store out east may have had more relays to choose from than mine here.

Where did you find the 40 amp lighted switches?

 

Hey grizz... true, shipping can be a PITA... but I figured you would want to pick up something else too? Like, they also sell wire, crimp connectors, various types of taps, switches, etc... everything you would need. You would probably want all of these things to hook up a switch... and probably some wire loom to so you aren't running bare wires.

You shouldn't need a double-pole model relay, though... but I believe that most good (e.g. Bosch) relays will also be double-pole since manufacturing a double-pole is just as cheap as doing a single-pole. So, you can buy a double-pole relay and just not use the second pole.

BTW, I am not affiliated with parts-express... just a fan... good price, good selection, and excellent customer service.

 

Just so you know, the amp draw depends on what the circuit is powering. A simple indicator light will only draw a few amps. The coil circuit on the Relay also draws less than 5 amps. If you notice my diagrams only use a 10 amp fuse for the switches. BTW the relays I have pictured are SPDT relays. The Terminal in the middle #87a makes it a Double Throw. The Kill switch the way I have it wired needs a SPDT relay so it can power the circuit when it is turned off. Turning on the Kill switch kills the power to the fans. The Fan on relays need only a SPST relay. The middle 87a terminal is not used for them. The closer to the fans you can place the relays the less power loss to the fans there will be. Mine are placed on the firewall next to the starter relay switch.

JMC

 

Ok so the switch does not need to be 40 amps.
That is good news. I can find one of those anywhere now.

The relays are all very confusing to me.
You are now talking about SPDT relays to me that is single pole double throw. I was talking about STSP or single throw single pole (what princess auto carries) or STDP single throw double pole relays (the kind you said to use in your diagram). I guess I will need to educate myself further on relays before I attempt the wiring of these switches. I might just wire in the fan on switch for now as I don't really thrash my truck around in the mud (I have a quad for that). I bought 3 of the STSP relays from Princess Auto as I thought on Friday that is what you used now I am not sure. Maybe when the fans arrive I will have figured this sh*t out.

 

Count the terminals on the relay. 4 = SPST 5 = SPDT.

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I see the image now. 12 volts comes from battery to Pin 87 and Pin 87a then flows to 30 to go to the fan. A rather ingenious way of saving Wire. I might just rewire mine that way.

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It would eliminate any possibility of the diode inside the controller creating too much heat and burning out if the fan is in ON OVERIDE for extended amount of time. May not be an issue with the new controllers. Would be a good saftey measure to ensure no damage is done.

 

Thanks 4rd4life. I am going to try the fan on switch this way too.

I think my confusion about the relays is different people/places are calling the same relay by different names and I am getting hung up on the terminology. I see that the ones I picked up from Princess Auto are 5 plug relays. So I think that problem is solved.

Has anyone received their fans from the group buy order yet? My card had not even been charged the last time I checked.