Norther twin Spal fan wiring?

[71stang99]

I wired this up like so: 1 black wire +12v switched on tied to the MSD switched 12v (old coil wire) 1 back wire tied to the thermostat sending wire 1 green wire to grounded to engine block 1 blue wire tied to 1 side of the fuse block (2 orange wires, 1 to the + battery) Is this all thats required to turn on? I would think it being wired like this (according to instructions) it would always run the fan when the key is in the on position. I turned the key to the on position, should the fans have turned on? I did not try to start as I do not have the distributor in the car. Thanks.

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[Gun Jam]

it kind of sounds like it thermostatically controlled....If so it won't spin up until the car reaches operating temps...then it still might not come on.

-Gun

[71stang99]

Thanks for the reply, that is what I wondering about, here is the link to the instructions:

http://www.hrpworld.com/client_image...pdf_6027_1.pdf

[fakesnakes]

I think you have a couple of potential issues:

1. The black wires are supposed to go to ground, not 12v and are connected to each other inside the relay. You have one connected to your MSD +12v supply and the other to a thermostat (more on that in a minute). If this is an on/off switched thermostat, then as soon as it heats up it will ground this wire shorting out your coil circuit.

2. What thermostat are you using? You can't hook it up to your guage thermostat, it needs a dedicated on/off type that connects to ground based on temperature, not a variable resistance type used on gauges.

3. I don't understand this statement: "1 blue wire tied to 1 side of the fuse block (2 orange wires, 1 to the + battery)". Does that mean that one orange wire is connected directly to the battery? This could be another problem, but I don't know what the orange wires are (Are these the fan +12v leads?).

Here is how I would wire it up:

fuse holder: Battery lug on solenoid
1 black wire: toggle switch with other side to ground (manual fan control)
1 black wire: dedicated on/off thermostat
green wire: ground
blue wire: 12v lead on each fan (one fan per connector)
fan ground: other terminal in connector (one fan per connector)

Now the fans will not turn on until either the preset temprature of the dedicated thermostat is reached or you turn on the toggle switch.

[71stang99]

The orange wire I was referring to is what the instructions called 'fuse holder' All it is is two orange wires with a 30 amp fuse of which one side it wired to the + battery terminal while the other goes to the blue wire listed in the instructions.

The two back wires according to the instruction were to go to a switchable 12v source and the thermostat of which I did not know that it takes a different type of sensor.

So it sounds like it would be easier to buy a switch as replacing the sending unit with a suitable type would negate the factory temp guage in the car?

Thanks,

[fakesnakes]

Gotcha! In that case, let me revise my wiring:

fuse holder: One orange wire to blue wire on relay and other to battery lug on solenoid
1 black wire: switched 12v (MSD lead would work)
1 black wire: dedicated on/off thermostat (if you also want a manual switch, wire a toggle switch to ground and the other side to this wire)
green wire: ground
fan connectors blue wire: 12v lead on each fan (one fan per connector)
fan connectors ground: other terminal in connector (one fan per connector)

As for the thermostat, either locate another coolant port on the manifold (after market manifolds usually have two), connect a tee where you can keep your existing gauge thermostat and add a switched thermostat, or use a remote thermostat.

Here is one for the manifold:

http://store.summitracing.com/partde...5&autoview=sku

Here is a remote adjustable one that uses a probe you insert in the radiator fins:

http://store.summitracing.com/partde...5&autoview=sku

[LCC]

I'm assuming you have it connected to a single wire sending unit, first diagram. So I would test it by putting the key forward (run position) and shorting the sending wire to ground and the fans should go on.

[71stang99]

I followed fakesnakes advice and ordered another thermostat just for the fans that would fit into the manifold, it should be here by Thursday so I can try it then.

Thanks

[71stang99]

Just an update as I had everything put together, during the initial break in on the cam the fans would kick on and off while the guage in the car reads higher then what it did with the stock shroud and fan which is probably ok as it was at idle and I never had the chance to drive it yet. Also the sensor turns off at 180 and on at 200, with a 192 thermostat this shouldnt be a problem would it?

fastsnakes-thanks for the link and input.

lcc-you right as I was able to test them prior to startup by grounding the sensor which makes it easy to add a switch to the system.

[fakesnakes]

It sounds like it is working perfectly. Nice job!