| Re: [GMCnet] Re: New LED front turn lights not working right... [message #369366 is a reply to message #369364] |
Sat, 02 April 2022 16:05  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
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James Hupy wrote on Sat, 02 April 2022 15:51I got an education on polarity when I converted my GMC 78 Royale's clearance lights on the roof. I bought all new led lights and hooked one of them up and turned the power on, and nada, nuttin', and scratched my head and exclaimed Wth!. So, out comes my trusty Fluke 77 and it told me the story. No rhyme or reason to the wiring. Polarity on all of them was different. So, turn on the power, check the polarity, hook up the led, repeat x 10. Same is true throughout the whole 12 volt system in the coach.
Incandescent's don't care about polarity. Led's definitely do. Now I check first, then proceed.
Jim Hupy
Salem, Oregon
Fortunately, when I mounted the first of the LED clearance lights, I turned it on because I was curious what it would like like. It didn't. Also fortunate was that was one of the few where I could get to the connectors. So I reversed the polarity and it looked good. I mounted the other nine powered up.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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