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This evening I was out trying to troubleshoot the LF clearance light on my mil semi trailer. I ended up pulling the whole light assy as it was very corroded. When pullling the wire harness out I found a second wire in the harness. Since I had the test light up there and was hooked to the tractor, I tried to figure out what the wire was for. I had an idea but didn;t want to get my hopes up. Low & behold I turned the BO lights on and the test light came on. Seems that my semi trailer is wired for BO markers as well. I guess that means I'll be needing 4 more marker lights. That brings the total I need between the semi trailer and pipeline truck to 26. Got 12, 14 to go.