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Brake Lights...Help!

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So I recently was informed that my right brake light is not operating properly. The running light comes on, but when I apply the brakes the light on the right side shuts off completely. I checked the dual filiment bulb, and both filiments are intact.

Now here's the really weird part, when the engine is off (AC off) and I apply the brake, IT WORKS! :gasp:

I'm not great with diagnosing electrical issues, could it be the brake light switch? I have checked all fuses associated with the rear lights and they are all intact. Any help would be great!

1999 Impreza Outback Sport
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· Premium Member
(formerly) 03 H6 OBW , (presently) 06 WRX Sportwagon & 2021 Honda CR-V
19,680 Posts
are the filaments VERY close to touching? If you swap sides with the bulbs, does the problem follow the bulb?

· Registered
'99 Outback 2.5 GT auto & '97 LegOB w/ grossly insulted 2.5
141 Posts
Sounds like early to mid '60s full size Chevy 'winky tail/brake light syndrome'; caused on those by corrosion in the lamp socket(s), which were two-piece. I generally start on the ground side, checking for voltage drops at the grounds, when weirdness such as this rears its head.
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