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  1. #21

    Re: Indicator Light- 12v or 120v?

    If you are sure the wires coming from genny are 120vac, and the light is rated for 120vac then polarity doesn’t matter. AC current is both positive and negative. The led being a diode will block all the current in the wrong polarity. The resister will reduce the voltage to something the led can work with.
    Thanks,

    Tony

    2008 Cheoy Lee Bravo 78 "Bella Sophia"
    1989 78' Hatteras CPMY #311 "Bella Sophia" (sold)
    2007 Everglades 290cc “Bada Bing” (sold)
    2006 Advanced Outdoors 28cc (sold)
    2003 Melges 24 "Bada Bing" (sold)
    2023 HCB 42 “Bada Bing”

  2. #22

    Re: Indicator Light- 12v or 120v?

    Thanks Tony and all others who helped.

  3. #23

    Re: Indicator Light- 12v or 120v?

    A footnote on this subject. While DC LEDs will illuminate on AC input voltage as indicated by Tony, they will do so with reduced brightness and may appear to flicker to the human eye. This is why AC versions of LEDs are sold which add an AC to DC rectifier in the indicator, yielding full brightness flicker free illumination. Best to match the LED to the input voltage characteristics.

    Pete

  4. #24

    Re: Indicator Light- 12v or 120v?

    Problem solved. I was able to trace out the old feed wires to good old fashion red and black. All wired up and working fine with genset still decomissioned.

  5. #25

    Re: Indicator Light- 12v or 120v?

    Quote Originally Posted by JLR View Post
    Problem solved. I was able to trace out the old feed wires to good old fashion red and black. All wired up and working fine with genset still decomissioned.
    That's strange. Red and Black would indicate DC as would red and yellow. Black and white would normally be AC. Are you sure this light is fed with AC?
    Sky Cheney
    1985 53EDMY, Hull #CN759, "Rebecca"
    ELYC on White Lake--Montague, MI

  6. #26

    Re: Indicator Light- 12v or 120v?

    X2 with sky.
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  7. #27

    Re: Indicator Light- 12v or 120v?

    It seems that way. Also, I accidentally touched the leads together in stripping the feed wires and sure enough, it tripped a breaker on the AC panel. Thereafter, just to be sure, I shut down the AC panel and disconnected the boat from the dock and had no current running through these wires. But, boy, what a spark when they touched. Scared the heck out of me.

  8. #28

    Re: Indicator Light- 12v or 120v?

    What size breaker is on it?

    Is it just the indicator light on it?
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  9. #29

    Re: Indicator Light- 12v or 120v?

    Spark tested. Maybe not the best process I can think of.

    For future projects get a meter and double check first. I never work on live wires.
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  10. #30

    Re: Indicator Light- 12v or 120v?

    No. the breaker was labeled fly bridge outlets as I recall. Also, needless to say, the light is on whenever the boat is plugged in or when the genset is running because it is lit now when the boat is plugged in. The light that I removed was definitely 120 volts as is the new one I installed.

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