roof marker lights out...help

[upgrade]

Power is supplied from INT PRK Fuse 10A, located in Fuse Block-Left I/P. This leaves with BRN Wire routed to Fuse Block-Right I/P, pin B11 of connector C1. The BRN Wire leaves Fuse Block-Right I/P at pin B of Connector C^. All three lamps are wired hot. The common ground for the Base Crew Cab and Uplevels is G200, located on passenger side of dash.

I have read and re-read this about a dozen times. Is there any way you could please break this down into layman terms and where exactly is this almost inaccessible location.

My situation: I have a 03 Quadrasteer that came w/ led lights inside the marker lamps giving off a piss yellow color. I swapped them out for the factory 194 bulbs. After the swap I noticed the 3-light roof marker and the single light above the driver didn't work. When I replaced the driver side light I noticed it was now foggy so I replaced it. Then I made my way to the 3-light roof marker and noticed all those bulbs were fine. Light above driver is now working fine but middle 3-light roof marker is still inoperable.

[hogdriver]

Where is the fuse block Left I/P located?

[JohnC]

Open the driver's door and look at the butt end of the instrument panel (I/P). There should be a small panel that pops out.