My wait to start light/water in fuel light dosen't come on. Not a real big deal I don't guess, but would like for them to work.I pulled that panel out and it is plugged in but haven't went any further with it yet.

 

This is on the 89? The non-IC motors have a different heater grid set-up. The modules don't actually turn on the "Wait to start" until about -14*C or -5*F. I know this because I noticed the same thing, and was concerned about it. So over the winter when it was about -15*C I did not plug in the truck and then went out in the morning to see what would happened...sure enough the wait to start came on and the grid heaters hummed and buzzed away.

What I find with my 89 set-up is that the grid heater cycles in short burst while warming up. The module is warming up the intake air temperature. Usually does this or 1-3 minutes of so.

 

Sweet, wasn't too worried about it since I'm in Florida but do feel better about it now. Thanks

 

that's only on the first 8000.every modue is serial numbered on the back.after that number they come on at 59*

 

my 90 d350 is like cows its got to be really cool befor my lite comes on, but my 91.5 d250 comes on all the time long in the mornings& real short the rest of the time.