Hi Jamie - I always start with a circuit testing light to see whether the
socket is working or not before replacing a bulb.  If the test light is
properly grounded but not illuminating, then I scrape / scratch the
contacts of the socket to see if corrosion is the problem.  Often you'll
get a flash or the tester will illuminate and then stop.  At the same time
I also see if gently pulling or moving the wiring attached to the socket
makes a difference with the circuit.  If there is no illumination then I'm
checking the grounds.  You can also ground the socket with an alligator
clip to see if that helps at all to see if it is a grounding problem.

Another issue could be the wire terminals are corroded or broken - look at
the ends where the terminals attach - see if there is power coming to the
terminal using the circuit tester.

Bruce

On Wed, Mar 15, 2023 at 2:39 PM Jamie Auch <jamie@kookymathteacher.com>
wrote:

> Dear list,
> I went to replace my taillight bulb on the passenger/ right side of my
> 1990.
> I replaced the bulb but still have no light. I do have brake and turn
> signals. Where do I start problem solving? Thanks.
> -Jamie Auch
>  The Kooky Math Teacher
>
> Sent from my iPhone