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What is the name of a default closed switch?

Motor Vehicle Maintenance & Repair Asked by Nathan DeWitt on July 23, 2021

I have a 2005 Ford Excursion. It has a parking sensor which beeps when it senses something close to the rear bumper. When pulling a trailer, it beeps every time I put it in reverse. I can turn it off, but it turns itself back on each time I shift into reverse.

My brake controller wiring harness knows when a trailer is plugged in. I would like to tap into this wire, and when it is hot turn off the parking sensor. When I don’t have the trailer, I would like the sensor to work as normal. I prefer not to have a rocker switch because I will often forget to turn it on/off.

What is the name of the component I’m looking for? I want the parking sensor wire to be closed when the input is 0V, and open when the input is 12V.

One Answer

A relay will do what you want.

Get one with 5 terminals as that has contacts changing to “open to closed” and “closed to open” on power, and that is the functionality you want.

Answered by Solar Mike on July 23, 2021

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