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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2005 Ford Ranger EDGE
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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 2.3L 2wd Factory "Hurst Special" < getting low
1985 XLT 2.8L 4x4 "The Black Pearl"
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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2001 Ford Ranger Edge single cab 3.0L 5-speed with 3.73's, 32x11.50 BFG A/T, 3.5 inch fabtech spindle lift, AAL, Painted grill black, 5% rear tint 35% side, removed front plate, painted interior to match the truck, rancho shocks, 15x8 eagle alloys Series 054, new seats, rear bumper switched out painted to chrome, flowmaster super 44 catback, bed liner, rail caps, fog light mod's,throttle cable mod,turn signal mod, headlight mod. LED bugman mods! HID 6k headlights and fogs, 06+ tails

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