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ELECTRICAL CIRCUIT HELP

1964 b body

1964 b body

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Ok here we go. First of all you need to know that I am dumb as a post when it comes to electrical work. My 64 Savoy has a custom built aluminum radiator with an electrical fan. I want to regulate the fan manually with a togle switch. I bought all the new parts I was told I needed to acomplish this task. I installed the parts to no avail, I seem to be wiring it wrong. I first checked to make sure the fan is working manually and it is. I have attached a picture of the circuit I have installed and am hoping one of you guy's can explain to me how to wire it properly.
Circuit.jpg
 
Why wouldn't you want to run a thermostatic switch? It will save you the aggravation of switching on/off all the time
 
You just need a constant hot from any circuit really to run through your switch to the coil on the relay. If you use a circuit that is only live when the key is on that's ok too, you just wont be able to run it with the key off.
Take a fused lead from the battery and connect it to one side of the open contact, then from the other side go to your fan.
Make sure your relay is a 40a and depending on how many apps the fan pulls, I would run a #10awg min.
The switch can be a 14awg. Dont use solid wire!
The switch only controls the relay, the fan gets its power from the battery.
Pretty simple.
 
Run your wire from the switch that turns it on and off to terminal 85 and ground 86, your fused power from the battery goes to 30 and the fan on 87 not 87a.. other fan wire is grounded.

You can also reverse it and wire the relay with 12V to 85 all the time and use your switch to provide the ground to 86 instead like they do in horns.. eliminates the possibility of getting a tingle or shorting it out in close confines.


Screenshot_20210412-090826.png
 
Last edited:
Mike67 said:
You just need a constant hot from any circuit really to run through your switch to the coil on the relay. If you use a circuit that is only live when the key is on that's ok too, you just wont be able to run it with the key off.
Take a fused lead from the battery and connect it to one side of the open contact, then from the other side go to your fan.
Make sure your relay is a 40a and depending on how many apps the fan pulls, I would run a #10awg min.
The switch can be a 14awg. Dont use solid wire!
The switch only controls the relay, the fan gets its power from the battery.
Pretty simple.
Click to expand...
 
1964 b body said:
Does this look right?View attachment 1096637
Click to expand...
Hard to make out the drawing on my phone but it looks like you've got both 85 and 86 grounded, you have to have one side grounded and the other with 12V. Doesn't really matter if your switching the ground or the 12V on and off but you still have to have both present. Here's the 2 options
IMG_20210412_102225297.jpg
 
Last edited:
86 and 85 is your coil that activates the relay and typically are not polarity sensitive.
A thermostatic switch can be implemented easily, they make adjustable ones that have a sensor that goes against the radiator or you can buy one that goes in your cooling system but is not adjustable.
 
THANKS to everybody that replied to my post. I finally figured it out yesterday and gotter done.
 
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