WTS light lit waaaay too long.....

[towcat]

This is on the company truck. '97 f450.
The WTS light stays lit for at least 1minute in 90deg outside temps.
Company parts changer has replaced the GP's and GPR. The little black box/relay doohickey near the fuel filter has been changed too.
Is there a temp sender that senses the water temp in these trucks for the cold idle curcuit or is there something else wrong? I can't dig too deep into the truck since it's not mime and the union forbids me going under the hood other than to check the oil and water
any suggestions?

 

[Double-S-Diesel]

oil temp sensor , map sensor, or baro sensor

 

[towcat]

I think I'll plug in my brick later on today to see what's up.
thanks for the suggestions.

 

[Double-S-Diesel]

those are the things that control wts light and glow plugs on, but dont be suprised if the Oil temp reads -51

 

[geonc]

but dont be suprised if the Oil temp reads -51

A shorted/ defective oil temp sensor will throw the start circut into Alaska start mode for sure...how does it run at operating temp Calvin?