Ive searched alot and cannot find a deffinate answer really. I have the 3.8 taurus fan and I want it hooked up to a toggle switch. This is a track only car so im not worried about forgetting to turn it on while in traffic or what not. My question is how do I do this without starting a fire. Everything I read says what didnt work for people. What will work? THANKS.
ELECTRIC FAN ON TOGGLE SWITCH
- Thread starter CONCRETEWARFARE
- Start date
Use the toggle switch to activate the switching leg of a Bosch 75amp relay.
That's how i do mine.
Use 10G wiring off the POS side of the starter relay to the 75A relay, and then onto the fan. Then use 18g wiring for the switching side of the relay. Tap into a Ignition ON power source (or constant if you want to run the fan with the car off) and then install a toggle switch and then wire it to the relay.
The switching side of the relay sees virtually no load..maybe 1A tops. So you are safe there.
That's how i do mine.
Use 10G wiring off the POS side of the starter relay to the 75A relay, and then onto the fan. Then use 18g wiring for the switching side of the relay. Tap into a Ignition ON power source (or constant if you want to run the fan with the car off) and then install a toggle switch and then wire it to the relay.
The switching side of the relay sees virtually no load..maybe 1A tops. So you are safe there.
That's how i run mine except i run the controller unit that has the heat sensors that goes into the radiator hose....because every damn time i've ran a toggle i end up forgetting that it's on and run my battery down.
My Taurus fan is hooked up pretty much the same way.
Mine is a a two speed fan so I have two relays. The low speed relay is hooked into a ignition on source and the high speed is on a switch.. For a DD I think this is the best way, other than a controller, since you don't have to worry about accidentally forgetting to turn the fan on. But for a track only car just a switch with a relay would be fine.
Mikie
the ahead of you horseman
Not to hijack the thread, but I wanted to do an e fan like the taurus unit. Can you use relays and wire it up basically to the accesory fuse so that it runs on high the whole time the car is running? This eliminates the toggle all together.
Any ideas?
Any ideas?
Yes, do what i just posted, except skip the toggle. You will still need a good sized relay like the bosch 75A. Then tap into the hot wire on the low coolant sensor switch for the switching leg of the relay.
Anytime the key is in the on position, the fan will run. It won't run in ACC.
I usually run with my fan on all the time. Only time i shut it off is when i make a 1/4mile pass. I turn it off, make my run and on the return road flip the switch back on.
My cooling system works so well i don't need the fan on most of the time, but i run it anyway. One of these days i will wire it up with a temp-actuated switch, and a 3-way toggle to switch between "constant on" "OFF" and "temp switch activated". I have the wiring all schemed up lol
One thing i want to do is a warning light. I can't figure out how to do this electrically though. I have an Autometer mechanical temp guage in my a-pillar and i want to mount a yellow LED next to it. If the fan is not spinning, i want the LED to illuminate. If the fan is on, it shuts off. I could wire it up so that any voltage on the power wire would open up a normally closed relay and turn the light off, but if the fail fails, the light would not go on. I need to figure out a way that i can sense the current draw to turn the fan off. No current draw, light goes on.
onefstsnake
New Member
I pretty much wired mine like jrichker said.
Just one 30A relay wired to the fan/batter/and ground.
Then a wire that runs to a toggle to turn it off and on with.
I really like this setup but wouldnt recomend it if other people drive the car. Wouldnt want to have someone forget to flip the fan on...
Just one 30A relay wired to the fan/batter/and ground.
Then a wire that runs to a toggle to turn it off and on with.
I really like this setup but wouldnt recomend it if other people drive the car. Wouldnt want to have someone forget to flip the fan on...
You got good advice and took it - kudos to you. Electrical systems that have unrated parts used (10A switch and 18ga wire running a 40amp fan) is probably the most frequent casue of fires in cars that have been electrically modified in this hobby.
onefstsnake
New Member
Isnt a relay somewhat like a fuse?
If you put 60A through a 30A relay its not going to work very long.
No a relay is not a fuse. You can't garantee the relay will fail and break the connection. The contacts could weld shut from the overcurrent and now you have a potential fire
87Mustang351
Member
87Mustang351
Member
Similar threads
