Re: High mounted brake light comes on with headlights
<email@example.com> wrote in message
>I have a 1990 240DL wagaon.
> I had a brake light go out last week, bought a new bulb...no biggie.
> Next day the bulb warning light on the dash went on again....this time
> its weird.
> If I brake, all 3 brake lights go on as they should - but so does
> warning light on dash.
> But if I turn the headlights on, the warning light comes on....and the
> high mounted brake light is on, whether I'm braking or not.
> I have tied wiggling sockets, replacing other two bulbs.....I removed
> and reseated the fuse and the problem went away for about 10 minutes,
> then came back.
> Any tips what to look for?
Try removing the tail light bulbs, then seeing if the problem is still there
(I bet it isn't). Then try the bulbs one at a time to determine which side
is causing the problem. Then, swap the bulbs to see if the problem stays
with the side or with the bulb.
If the bulb is doing it, replace the bulb. It will either be the wrong type
(single filament instead of dual) or will be internally shorted by a broken
piece of filament. If it stays with the side, look at the socket connection
to the shell of the bulb and the ground connection to the socket. A
voltmeter or test lamp helps, but it can be done without.