It's been over a year since I first started thinking about installing a radiator fan switch using an OEM switch and a latching relay. I have had a temporary switch installed near the fan relays for several months which works, but isn't very clean. I wired this up this afternoon, and it works!
After acquiring all of the parts I finally had some time, and started on this project today. I plan to eventually make a DIY guide when I finish, but I wanted to provide an update, because I know a few people are interested in installing manual fan switches.
I started by installing the two switches into the batwing trim piece. This is harder than you might think, I found the best strategy was to place the batwing on the edge of a table (with cardboard underneath to protect the table), and then give the batwing a few good whacks with my hand to get the switches to snap into place. They should sit flush when they are installed correctly.
I am also installing a garage switch to fill the extra switch opening in the new batwing. I cracked open my garage door opener, and used a small wire to determine which two contacts needed to be connected to operate my opener. Once I determined that, I soldered two wires to each contact and drilled a hole in the case to run the wires out of.
On the garage switch pins 1 & 2 connect with pin 4 to open/close your garage. I have pins 1 & 2 wired together so either side of the switch will operate one garage, if you have two garage doors you could wire them separately and each side of the switch would open a different garage or gate. Pin 5 on the garage switch is the night illumination ground (Illumination-), Pin 3 is the illumination power (Illumination+).
You can see that the wire from Pin 3 runs across to Pin 3 on the radiator fan switch. I have two female connectors coming from the garage switch which connect to the Illumination+ and Illumination- from another switch or the cigarette lighter.
The fan switch is wired to the latching relay using the instructions in my previous post. Switch Pin 3 is connected to Pin 3 of the garage switch, and Pin 4 is wired to the 12V switched power from the phone connector.
Switch Pins 1, 2, 5 are wired to the Relay Pins 14, 12, 5, and Relay Pins 8, 9, 10, 13 are grounded, Pin 11 runs to the Fan Relay Pin 85.
Ignoring the Illumination+ and Illumination- which are coming from the garage switch, there are three wires that need to be hooked up for the fan switch and latching relay to work:
-12V Switch Power from the phone connector
-Ground from the phone connector (You could also combine this with the Illumination-)
-Fan Relay Pin 85
The latching relay requires 12V to operate, if you want to test the switch and relay before the final install. Mine worked perfectly when I tested it, and the switch LED illuminated amber to let you know the fans have been turned on. My only concern right now is that the amber LED might be too bright, but I'll deal with that later.
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