Help! Wire and bulb melted during an attempt to upgrade to LED. - Defender Source
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Old July 12th, 2010, 12:21 PM
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Carl Jonsson
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Help! Wire and bulb melted during an attempt to upgrade to LED.

I need someone to tell me why my the wiring for my rear window wiper button light would melt when I tried to replace the regular bulb with a teeny-tiny LED bulb? Both are small Wedge type car bulbs. The LED one is polarized, I'n not sure what that means. The wire and the bulb melted in about 5 sec but the fuse didn't blow. Shouldn't the fuse blow? Did I short circuit it somehow? Not sure what to do, I could swear I had picked the right bulb (12v, wedge, car bulb, etc).

Help.
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  #2  
Old July 12th, 2010, 01:07 PM
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Tom
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Quote:
Originally Posted by Manimal View Post
I need someone to tell me why my the wiring for my rear window wiper button light would melt when I tried to replace the regular bulb with a teeny-tiny LED bulb? Both are small Wedge type car bulbs. The LED one is polarized, I'n not sure what that means. The wire and the bulb melted in about 5 sec but the fuse didn't blow. Shouldn't the fuse blow? Did I short circuit it somehow? Not sure what to do, I could swear I had picked the right bulb (12v, wedge, car bulb, etc).

Help.
Carl,

LED (Light Emiting Diode) is polarized, meaning it must be installed in the right polarity -+ to function..
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Old July 12th, 2010, 01:57 PM
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David Marchand
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Also check to make sure the contacts are located in the same place. Not all wedge bulbs have the same contact setup.
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Old July 12th, 2010, 03:49 PM
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Carl Jonsson
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Will do.

If installed incorrectly shouldn't they just not work? Any idea why there was a meltdown?

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Originally Posted by dmarchand View Post
Also check to make sure the contacts are located in the same place. Not all wedge bulbs have the same contact setup.
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Old July 12th, 2010, 07:28 PM
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Andrew Najarian
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I am not sure why you experienced a meltdown, but I have found that the LED bulbs usually come with the contacts such that they will short out if you don't modify them. I saw this after installing one that didn't work, but I didn't have a meltdown...

IIRC, the LED's come with contacts on both sides of the base and the Rover sockets are designed in such a way that both sides of the bulb are connected to both contacts if you don't modify them.
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Old July 12th, 2010, 11:33 PM
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Carl Jonsson
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Andrew.

I think you are right! The two wires exit, one on each side, then bend around to go up around the other side almost all the way up to meet the exit of the other. This does not seem to be the case with the Rover bulb. I'm going to snip them and give it another try.
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