Do you know how many amps that relay is rated for?
You are fusing the fan power wire as well right? You want to use a slow-blo type MAXI fuse for that.
The fuse on the battery-to-terminal-30 wire is in essence fusing the fan.
What gauge is the load-side wire going to that relay socket? It's probably not rated for 60 amps. You might end up using that small relay as a slave to drive a large relay.
If you are good with electrical stuff (90% of the people here aren't), build your own controller. The numbers on the diagram (#86, #87, etc) refer to the numbers on the bottom of a typical automotive relay.
Note that the temp sensor in the diagram needs to match the thermostat in your engine. The preferred arrangement is to have it open 5 degrees above the thermostat.
ok, i know i have beat this thread to death but i am hoping u guys can please help me one more time.
i want to have a light come on when my fan is on . according to diagram above i need to wire it into the fan power wire. is this the only way to do it because i am new to electical stuff and i have never wired one wire into another that goes to a power source?
can i use 87a on the relay or will that only light up when the fan is not on?
if the only way to do this is wiring the light into the fan power wire can someone please explain how to do this.
thanks for all the help with my begginer questions.
87 (not 87a) is the power from the relay to the fan (by the diagram above) so you can hook your LED + to that.
Wiring the (+) leg of the LED into the fan relay #87 will ensure the LED is indicating the fan is ON since the LED will be only drawing current when the fan is ON. That's what you want to see on the dash when it's lit.
All you're doing is taking an LED (preferably the number listed above from Rat Shack since it's made for 12VDC and doesn't need a resistor), soldering (preferably) a wire to the short leg (-) and a wire to the long (+) leg (LEDs have one leg longer than the other). Connect the wire from the short leg of the LED to ground (ground behind the dash, frame, whatever). Connect the wire soldered to the long leg of the LED to #87. Obviously you'll need a few feet of wire to go from the fan's relay to the location on the dash where you'll install the LED. The wire can be pretty small since it's not carrying any current. Make SURE the wire from the fan relay to the LED is wrapped, covered, heatshrunk, whatever, no bare wire or connectors touching anything. LEDs are cheap so buy more than one just in case you cook one.
You could put it inside the connector for the 87 wire before you solder the wiring connector. It could also be done at the fan-motor end when doing the freewheeling diode.
And I'd already mentioned that you could merge them in the electrical connector itself. That's simpler, and in my experience, taps don't like heat or vibration for extended periods of time.
The diode is not critical but it helps maximize relay life.
Right. Don't over complicate it flashbackyou could even peel back some of the insulation along that 10 gauge and solder it in anywhere. Just wrap it back up good with some heat shrink or cold shrink. You'll do fine
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?