>> One ought to use the correct brake light bulb or the car's cruise
>> control may be adversely affected.
>
>Out of curiosity, TG, what is the effect on the cruise control?
>Mine tends to be jerky; maybe that's just old technology.
The circuit is set up for the resistance of a decent bulb, Use
a crappy one and neither it nor the cruise will work right.
The choppy cruise is a broken solder joint. Take it out and
resolder EVRYTHING on that board and 99% it'll perfect again.
Use German bulbs. The dealer has them and they're cheap.

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