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12v switched power for Radar Detector

N2B8

Member
Nov 24, 2018
130
171
So Cal
BE98B67F-CCCC-40DA-9660-4E003AFB907F.jpeg

Not sure what I’m doing wrong. I plugged in the harness, then tested the red wire but there’s no power. I used the door jam as the negative. I tested the cigarette lighter and there’s power there. Do I need to do anything to enable power to the trailer plug?
 

skydve1

Member
Aug 31, 2021
67
80
Central VA
Not sure what I’m doing wrong. I plugged in the harness, then tested the red wire but there’s no power. I used the door jam as the negative. I tested the cigarette lighter and there’s power there. Do I need to do anything to enable power to the trailer plug?

Try testing red for positive and black for negative. As long as a door is open, or your butt is in the seat, you should have +12v.
 

N2B8

Member
Nov 24, 2018
130
171
So Cal
Try testing red for positive and black for negative. As long as a door is open, or your butt is in the seat, you should have +12v.
Just tried that w door open and in my seat, even put the car in gear. No power. Mine is a 2022 and I wonder if that had anything to do with it. Maybe they have to activate it?
 

skydve1

Member
Aug 31, 2021
67
80
Central VA
Just tried that w door open and in my seat, even put the car in gear. No power. Mine is a 2022 and I wonder if that had anything to do with it. Maybe they have to activate it?

That's odd. It's probably worth sending a message to Service via the app. I know they temporarily left stuff out of the 2022's , like the USB ports, due to shortages. Maybe something related to the trailer brake system is in the same boat.
Good luck!
 

Pics999

New Member
Dec 4, 2021
2
0
Canada
That's odd. It's probably worth sending a message to Service via the app. I know they temporarily left stuff out of the 2022's , like the USB ports, due to shortages. Maybe something related to the trailer brake system is in the same boat.
Good luck!
I was looking to get a harness myself for my 2022 Model Y but it seems you need the software now to make the plug come alive according the my to Tesla app anyways, might be out of luck, damn!
 

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N2B8

Member
Nov 24, 2018
130
171
So Cal
I was looking to get a harness myself for my 2022 Model Y but it seems you need the software now to make the plug come alive according the my to Tesla app anyways, might be out of luck, damn!
I'm curious to see how things work out for folks who install an aftermarket tow package for the new 2022 Model Y. Looks like I'm going back to the center console cigarette power source.
 

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