I don’t know your coach at all, but there is a manual on line for the 2009 Tuscany that includes some schematics that you may find useful, assuming not too many changes to your 2010 model. On page 104 there are a couple schematics related to the fog lights. One shows a secondary relay that is operated when high beams are turned on in your coach.....this relay cuts off the fog lights and turns on what the schematic calls “driving lights”. So this could be the other two lamps you are talking about....or just the low beams on your headlights......not sure, but thought I would respond until another owner in the know, chimes in.
https://www.rvroundtable.com/wp-cont...nersManual.pdf
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