Or, if you are good with soldering, you can create a bypass of the bulb failure sensor.

There is some voltage drop / current loss when electrical power passes through the bulb out or bulb failure sensor (at least you do not call it a relay).

I bypassed the bulb failure sensor using instruction by Dave Barton and Art Benstein.

Well, I found the Dave Barton info after the fact. Find it here:

240 uses the red case sensor.

https://www.240turbo.com/volvo240mods.html#bulbfailsens1

I have mismatched parking lights between the left and right so the bulb out sensor indicator dash light is on. The sensor reacts to a current flow imbalance for left and right for left and right low beam, left and right parking light side circuits, and left and right brake lights.

Hope that halps!
--
Beh.