How do I bench test a 2002 Cadillac Escalade EXT 3rd brake light (off of the truck)? - Page 2
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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, How do I bench test a 2002 Cadillac Escalade EXT 3rd brake light (off of the truck)? in Cadillac Escalade Forums; Yeah that is the correct procedure to test the light. A fuse is always a good idea good job! The ...
  1. #16
    N*Caddy's Avatar
    N*Caddy is offline Cadillac Owners Master
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    Re: How do I bench test a 2002 Cadillac Escalade EXT 3rd brake light (off of the truc

    Yeah that is the correct procedure to test the light.
    A fuse is always a good idea good job!

    The red wire is positive terminal and the black wire is the negative (GND) terminal.
    For the LEDs the polarity is important (LED = Light Emitting Diode) so basically an LED is a diode. And just like a diode it will conduct electricity one way and will be very high resistance (we can approximate it as infinite) the other way. There will be no damages to the LEDs if the polarity is reversed so you can test with confidence if one way doesn't work then just swap the wires (change the polarity) and it will lit.
    98cadillac and 98cadillac like this.

  2. #17
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
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    Quote Originally Posted by N*Caddy
    Yeah that is the correct procedure to test the light.
    A fuse is always a good idea good job!

    The red wire is positive terminal and the black wire is the negative (GND) terminal.
    For the LEDs the polarity is important (LED = Light Emitting Diode) so basically an LED is a diode. And just like a diode it will conduct electricity one way and will be very high resistance (we can approximate it as infinite) the other way. There will be no damages to the LEDs if the polarity is reversed so you can test with confidence if one way doesn't work then just swap the wires (change the polarity) and it will lit.
    Some LEDs can be damaged by reverse polarity hence why I said not to reverse the connections I didn't know it wouldn't harm these

  3. #18
    98cadillac is offline Cadillac Owners Fanatic
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    Re: How do I bench test a 2002 Cadillac Escalade EXT 3rd brake light (off of the truc

    Quote Originally Posted by N*Caddy View Post
    Yeah that is the correct procedure to test the light.
    A fuse is always a good idea good job!

    The red wire is positive terminal and the black wire is the negative (GND) terminal.
    For the LEDs the polarity is important (LED = Light Emitting Diode) so basically an LED is a diode. And just like a diode it will conduct electricity one way and will be very high resistance (we can approximate it as infinite) the other way. There will be no damages to the LEDs if the polarity is reversed so you can test with confidence if one way doesn't work then just swap the wires (change the polarity) and it will lit.
    Thank you for the reply and the details. The fuse was the cadillac man's idea, so thanks to him for that.

  4. #19
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
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    Quote Originally Posted by 98cadillac

    Thank you for the reply and the details. The fuse was the cadillac man's idea, so thanks to him for that.
    It's better to be safe then sorry(I learned that when installing my audio gear in my car(long process)

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