OK I wired up the fan running 2 relays and thermo switch. But I would also like to run a toggle switch to turn it on for heavy traffic times so it won't get to hot. How do I wire the switch? wire from fuse panel to switch and then to what the fan hot or the thermo switch hot?
Hard to be sure with out seeing how you wired it....... but I think that if you were to wire a toggle switch parrallel to the thermal switch it'd work just fine. ie.... the thermal switch would turn it on, or the togggle would bypass the thermal and turn it on.
go to the wire that is the 12v side of relay going to the fan.. pull a 12 hot from fuse panel to sw, out of sw to that wire on the fan side.. done !!!! u don't worry bout the sw and relay be'n on the same time either.. 12v is 12v no matter where it comes from and the fan don't care..
A switch in parallel with the sensor can be light-duty, a new dedicated switch has to be able to handle the initial fan load (similar to the rating on the relay). Wire size should match the load too.
both solutions above will work. the only problem i see is that if the switch is left on, with the engine off, you will kill the battery in short time. i am assuming your temp sensor uses a ground to turn your fan relays on and you have the relay control circuit wired like eodguy's picture in a non switched circuit. the only thing i would add is the switch to ground that bypasses your sensor and make sure that the coil circuit (wire 85) is switched
You really don't need to add a switch to your cooling system. If you have a thermoswitch that's set for say 185, then the fan will be running if the temp is above 185. If you get in heavy traffic and the temp goes above 185, the fan's gonna be on and you can't flip a switch and make it more on. If you are going to be driving in heavy traffic that makes your car run too hot, then you need more radiator or more fan.
now that is funny.
and i agree with your thoughts about the switch
some guys just want control
me? i use the thermal switch on my truk fan
eodguy, need to change your pic to have the thermal switch in parallel with the grounded switch before he sees it
and lets the smoke out of the wires
i know you know what to do and got hurried making the artwork
So this is how it is wired right now. Using a relay I have main power from power block to#30 86 goes to fuse box 85 goes to thermoswitch 87 goes to fan. So now I what switch goes to fuse box and then to 85?
If you do that you'll "let the smoke out of the wires" as Ogre would say......that line cracks me up.
I redid the dia to what you said your wires were going....... If your setup is wired like the new dia. all you need to do is install a toggle from a ground and the hot side of the thermal sw. (I have the gnd tied back to the thermal sw gnd but it can be any gnd)
i like your last pic eodguy and have my thermal switch wired that way with the relay, no manual switch
if i added a manual switch i would do like eodguys last pic
just make sure your fuse box wire 86 is switched with your ignition,
this way if you leave the manual switch on, your fan will turn off with your ignition
there is no added value to having your fan run without the motor running and circulating coolant
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