Check engine light coming on before I start the truck.

[2000_f350]

My ses light is coming on before I start the truck and staying on. Before it would come on and then go out before the WTS light. Now it stays on even after the truck is started. Anybody have a clue about this one?

[NoRalPh]

Yea, something is out-of-spec, it's set a code and the SES is telling you you need to retrieve that code for further diagnostics

Seriously, the light is on for a reason and you have to find somebody with a Professional scanner to find out why (unfortunately, our trucks can't be read with one of those cheap, generic, scanners the Auto Parts Stores use...)

[carolinaboy02powerstroke]

Find someone with an autoenginuity scanner or something of the sort. I have saved myself and friends of mine hundreds with mine.