I’m actually bidding on a mint condition uk 600, I like those huge old lights. I’m going to try new batteries and see if that works, the fuses look good, but I’m also going to get new ones. I’ll see what it would cost to send them in for repair or new bulbs. I found one of the fuses was blown so it very well could be the bulb. I’m half tempted to see if the new led module will fit in the body and just upgrade them.