Asking the H4O brain trust - Problem with my 2002 Tahoe. The 25A fuse blows when energized, resulting in no backup lights. I thought that it could be the third brake light, it was acting funky also, so I am replacing that today. I checked the bulbs and sockets for the BU lights. It worked for a couple of seconds, then popped.

I asked on one of those on-line "ask GM tech" places; wasted $25, he said check the blue connection behind the right rear wheel. I did that; now what? Now I turn to the forum! Should have done that first, but just wasn't thinking.