I am working on installing emergency warning lights into my 2017 F250 and need to have some lights turn off when I am in park. Ford does provide a wire that goes to ground when in park but it needs to be pulled up to VPWR by the 10K Ohm pull up resistor. Now I will admit I am not the best when it comes to this stuff so Im not 100% sure how to do this. I do plan to have the ground activate a relay to change it to 12V.
Here is the description and wiring diagram that Ford gives:
"PCM Pin 6.8L C1551E-19 Circuit No. CET22 Wire Color: Gray/Brown • An output from the PCM that indicates when the Transmission Range Sensor is indicating that the Transmission is in the Park Position. The Low Side driver in the PCM will pull this output to ground when active (Transmission is in the PARK Position). To properly reference this output, the customer supplied external controller/device needs to pull this output up to VPWR with a 10K Ohm resistor. Thus when the output is active, the voltage at this output will be 0 volts. When this output is not active, the output will be pulled up to VPWR by the 10K Ohm pull up resistor."
Any help on this would be much appreciated. I don't want to turn this into an expensive mistake!