current draw when key is off

[longscore]

Here is what I got.My truck wont keep a charge at all.I disconnected the negative battery wire,and then disconnected the hood light.With the key off and doors closed,i used a voltmeter on the negative terminal and negative battery wire.It was drawing 12.76 volts,and I could stand there watch it discharge.So I put the negative wire back on,and started pulling fuses and testing each circut,key off etc.when i got to the dome/interior light circut,it was drawing full voltage.I pushed little interuptor switch in the door jamb,and the draw only dropped by about a volt,so its live.The questions i have are 1-was there supposed to be a 30 amp fuse in that circut ,and 2-is there a common place for there to be a short in that circut?The 2 wires on it are a pink one an a 12 guage ,black wire with a red stripe.
And is the wiring diagram for the 1993 d250 the same as for the 1992 w250?I cant find the diagram for the 1992 w250 4x4.

[PToombs]

The wiring diagrams are the same as far as I have dug into mine. I have a '92 and and a '93 FSM. I would pull the drivers floor mat and look there, sometimes the wires wear thru and it could be shorting there.

[Mark Nixon]

Does your key "halo" light work?
It could be that the timer has gone faulty.
You might also look into the headlight switch's "dome" function being shorted.

Mark.

[longscore]

Thanks guys.I found it!It was a rub through where the wires run up into the steering colum.Pretty nasty up in there.I never reralised how much of a cluster-**** the wiring in these trucks is. Jeeze,I must be a glutton for punishment!