Hmm, I'm not sure that will work, the relay is probably calibrated for the draw of one bulb. If you put 2 in parallel that is double the current. Not sure what the relay thinks of that.

If it accepts double the current and still gives a good indication then you would have to lose both bulbs to get a fault. But I'm worried you might smoke the sensor in the relay with double load.

I'm pretty sure every bulb on the outside gets its own channel in the bulb monitor.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech