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I put my truck in 4wd High. It engages and works but my 4wd High light does not come on. The light comes on when I put the key in and start truck. The 4wd Low indicator light works when I have it in 4wd Low.
Mine is doing the same thing. I researched here and I believe it's the iwe switch. I ordered it for under $30 online and should have it in a day or so, I'll keep you posted.