I have a 1981 231/253 conversion, which I've owned for 7 years. It a great airplane. The one problem I have always had and never taken care of
is the gear indicator on the floor. I always need a flashlight to see the green line.
Now that I'm in annual, I told my mechanic that this MUST be resolved. Either the bulb is out, or the glass is so dirty that I can't see anything.
I stopped by the shop the other day, and they told me the problem was solved. They found out that the bulb was 24 volts in my 12 volts system
Unbelievable. Simple fix. They just installed a 12 volt bulb, and now as you can see, I can see:)