I want to put an LED in an automotive circuit to "read" the position of a potentiometer that is internal to a 12v motor. The motor, which opens a valve in the climate control heater, has an internal 4.7 kOhm potentiometer which delivers a signal to the climate control ecu. I will no longer be sending that signal to the ecu but rather would like to use it to dim an led or other bulb. I would like it to run on 12v nominal, I would prefer not to have to reduce it to 5v. If I just hook the power supply up to 12v and run the ground through the motor's potentiometer will the led/bulb dim as resistance is increased? A relatively gradual dimming from open to close would be nice but even if it is much more abrupt that will still accomplish what I want.
Brian

 

The owners of All About Circuits have elected not to allow discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

This thread is against the AAC forum rules, Chapter 6, as seen here:

6.Restricted topics.The following topics are regularly raised, are considered “off-topic” at all times and will result in your thread being closed without question:

• Any kind of over-unity devices and systems
• Automotive modifications
• Devices designed to electrocute or shock another person
• LEDs to mains
• Phone jammers
• Rail guns and high-energy projectile devices
• Transformer-less power supplies

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Here is a site that may provide you with some assistance: Electro Tech Online

Good luck