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Polarity...
Posted by Larry West [Email] (#1140) [Profile/Gallery] (more from Larry West) on Wed, 14 Mar 2018 08:32:04

In Reply to: Re: taillight bulbs replaced with LEDs -> errors, SWEDECAR [Profile/Gallery] , Mon, 12 Mar 2018 10:20:16
Alert me when someone posts in this thread:

Incandescent bulbs don't care about polarity, or where the current enters, and where it leaves.

LEDs, on the other hand, only work with current flowing in one direction. One side of the LED must see the +12v (hot), the other must see ground.

For bayonet bulbs, polarity is fixed. Hot and ground are always in the same place.

For wedge bulbs, you need to get the polarity of the LED replacement right. If the LED does not turn on when installed & activated, remove it, turn the base 180 degrees, and reinsert.

Had to do this on my 2002 9-5 for the City (globe) lights, and license plate lights. They all work perfectly.

_______________________________________ Current: 2002 9-5 Aero Kombi Cosmic Blue 2000 9-5 SE sedan, Imola Red 1990 900S Rose Quartz, Auto Past: 1999 9-5 LPT Combi 1999 9-5 LPT sedan 2002 9-5 Arc 1990 900 5-speed 1986 900 turbo Convertible 1991 9000 turbo 1980 99 GLi 1986 900 turbo 1986 900 S 1991 900 turbo 1984 900 turbo 1976 99 GL


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