my truck door always says its open i have a 1991 ford ranger

Try spraying WD-40 on the door latch

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spray some silicone or wd-40 in the latch of the door
then open and close the door until the light goes out

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1996 XLT 2.3T "White Lightning" 5/7 dropped, Turbo street toy
2006 FX4 Off Road, DD, work in progress
1985 XLT 2.8L 4x4 "The Black Pearl" (retired but still around)
1987 XL 2.3L 2wd R.I.P.

this is a common problem with rangers....
it happened to me too, just spray the latch with a little wd-40 and open and close the door a couple times.... it should fix the problem, it did for me and many other people that have had this problem
AND its a cheap fix too!!!

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2003 Ford Ranger XLT Ext. Cab
4.0L 2wd
3" Body Lift, 33" BFG A/T
Straight Pipe
more.. just ask

worked for me on my passenger door. it works

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-1995 ford ranger prerunner, 4.0, 4x4, 5-speed, 62k original miles, 2.5 radflo bypass front and 2.5 radflo triple bypass rear, deavers f23, 4.56 gears front and back, 07 seats, 07 mirrors, 35x12.50 bfg a/t, 4" fiberwerk glass front and rear, eagle alloy rims, 6k hid heads, two 8k hid off road lights, 34" led light bar, bed/roll cage/engine cage, 25 gallon fuel cell, cut and extended beams/radius arms
-2000 ford SVT f150 lightning -SOLD Lifted 2001 Ford Ranger EDGE, April's 2012 TOTM

okay, so ive tried every spray out there, lock-tight WD-40 etc and my light stays on alll the time! it even has the dome light come on when i take a sharp turn. idk what to do anymore ha i wish i could just pull the fuse for that door or something

Yeah my light stays on also. Tried the spray and it didn't work either, pulled the fuse for the light but the fuse also shuts down the speedometer. I finally had to take the bulbs out of the dome light and the cab light on the outside of the cab, at least till I can figure out what the heck is wrong with this thing.

Second Gen Rangers have a door ajar light? As far as I know, mine doesn't....

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Remove the door panel, buy a new switch, about $25 at Ford. It goes onto the bottom of the door latch. I had to pay a tech to remove the old one as I couldn't get it loose, but that solved my problem. 2001 ext cab 4 door.

or, save yourself $25 and spray some Wd-40 in there as suggested several times already. it works and its cheap

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I tried WD-40 first, and used a whole can with no success. The switch was just worn out. Jerry D