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Posted by: roydjt Dec 21 2015, 01:01 AM

When I say "brake light" vs "tail light" in regards to the rear lights, the dual filament bulbs perform both purposes. When the headlights are on, one filament is illuminated. When you step on the brakes, the other filament is illuminated. As for your third brake light, that's an LED cluster, so a change in resistance of the system (like a short across the other circuit) would cause them to illuminate much more dimly. Your bulbs should have two contacts on the base, like the photo below. The contacts may be round or oval shaped.


-Roy