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If your socket is getting power then the bulb should light. Are you checking for power with a test light or meter? Is it getting a full 12 volts or more? If you are is the bulb getting a good ground? If all this is good maybe the bulb you are trying is no good. Even new bulbs can get the filaments broken during shipping. Please rate my answer so I am awarded points for it.
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didnt specify vehicle -- generic answer -- recheck bulb new doesnt mean free from defect also check the socket --the light that lights up can be the tail lights some vehicles have one bulb but has 2 filiments [brake tail ]
First, check for good ground on the black wire. If that's good, then you've got a power problem. Power to the left brake light comes from splice BS02. Check the white/tan wire for power from the bulb socket back to that splice. Sounds like there's an open in the wire.
Check the socket for power (with a 12 volt test light probe) to the pin that operates the running light bulb filiment, use the other tailight for a guide or just touch all the pins, one should light the test light up
there must be a short circuit which powers tail lights and brake lights. probably you have a dual filament bulbs which have both brake and tail light together. check for bulb, socket/or bulb housing and harness of that light.
THAT RIGHT IF BRAKE SWITCH BAD NO BRAKE LIGHT WILL WORK.SPRAY ELECTRICAL CLEANER IN BULB SOCKET BULB SOCKET COULD HAVE OXIDATION AND CORROSSION CAUSING POOR CONTACT.
first eliminate the possibility that you have the wrong bulb in the wrong socket. it sounds dumb but going way back to 1157 bulbs there have been two rear tail light bulbs which will fit into the same socket but are electrically different. If you have ever driven down the road following a car which had one bright and one dim tail light, or brake light, then you have seen this in action.
since you have one good tail light assembly remove the bulbs, taking great care not to mix them up and make sure the bulbs are exactly same as in the non working assembly. i mean you have to look closely at the bulb's connection points as they will look very much the same.
if the bulbs are correct then you are looking at buying a new socket, or light assembly if the whole thing is wired into the car.
check to make sure that you have the correct bulb in the correct socket in both left and right tail lights. dual filament bulbs have to contacts on the base of the bottom of the bulb. make sure the socket that you are inserting them into also has two contacts. if that doesn't work then you need to get a test light so you can find out if power is going to the bulb housing and all ground. check all fuses also with amp meter
Look at the backside of the tail light area – it’s wide open. Turn the affected light bulb socket to the left. It’ll take some force, but you won’t break it.
Once it unlocks, you can pull the light bulb out.
Push the new bulb in.
Put the socket back into its place by pushing it in, then turning to the right. It’ll lock back into place.
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