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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.
2002 9-5 Aero Kombi Cosmic Blue
2000 9-5 SE sedan, Imola Red
1990 900S Rose Quartz, Auto
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
Posts in this Thread:
- taillight bulbs replaced with LEDs -> errors, Bruce A, Mon, 12 Mar 2018 09:52:51
- Welcome to the world of LED bulbs!, Larry West , Wed, 14 Mar 2018 08:41:101
- Canbus communications, Bruce A., Tue, 13 Mar 2018 13:32:51
- Re: taillight bulbs replaced with LEDs -> errors, bobc , Mon, 12 Mar 2018 18:16:41
- Re: taillight bulbs replaced with LEDs -> errors, SWEDECAR , Mon, 12 Mar 2018 10:20:16
- Polarity..., Larry West , Wed, 14 Mar 2018 08:32:04 <-- Viewing This Message
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