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License Plate Light Not Working...save me from a ticket!

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Old 08-20-2011, 11:23 PM   #1
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License Plate Light Not Working...save me from a ticket!

Got pulled over the other day b/c my license plate bulbs weren't working...got a warning. So I ordered some led's from superbrightled's, popped em in today...and the license plate lights still dont work! Checked the 10a tail fuse and everythings good. What else should I check? Any other fuses?

Seems that i've had re-occuring bulbs burning out...when I first got the truck in march a headlight went out, couple weeks later a tail light, then half the dash went out, and also a climate control knob light burnt out. And now the tail light bulbs?! Anybody have any idea whats up?
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Old 08-21-2011, 06:56 AM   #2
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Is any power going to the LEDs? Stick a volt meter in there and check.
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Old 08-21-2011, 07:35 AM   #3
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Some times the circuit ampacity wont support an LED bulb, or the stock plug has opposite polarity than the LED bulb and will not power it. If you don't have a multimeter, your next step is to purchase the OEM bulbs and replace them, then go from there.

If you do have a multimeter, test DC voltage at the plug like Jsutter said. I would also measure resistance to ground.
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Old 08-21-2011, 09:49 AM   #4
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Ill try and have someone get me a multimeter today...there's nowhere to buy one in town lol. What does measuring resistance to ground do?
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Old 08-21-2011, 07:17 PM   #5
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Measuring resistance to ground tells you wether or not your circuit is shorted to ground. For example, if you have a worn or bare +12v wire that is touching the frame, you'll measure 0hms to ground, demonstrating a short.

You can get a cheap, basic multi-meter supporting all the features you need to work on a 12v DC circuit at Autozone or Advanced Auto Parts.
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Old 08-21-2011, 10:05 PM   #6
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So I borrowed a multimeter...got power. Then put the bulb back in and checked once more...and the light came on? So I pulled the other bulb out and started bending the metal pins a bit and put the bulb back in and after some wiggling it came on. Sweet! lol thanks everybody.
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