Basically ford truck/excursion/whatever + dome light stays on = wd40. Figure 4. The worst thing that can happen, and it happened to me, is that the control box located in the right rear well (near the wheel) has gotten wet and is shorting out. The most common cause of this problem is when someone other than the driver uses the dome light or dimmer switch. I am working on a 1997 blazer four door. 2002 F250 SuperDuty Lariat PSD 7.3 Crew Cab 4x4 302,000+ miles. That is an easy DIY fix, as is replacing the door switches. i have replaced both front door plunger switches, the dome light on/off wheel and the interior lights and accessory module under the dash and all fuses are good. If the WD-40 fix does not turn off the light, we recommend having a mechanic take a look. A faulty dome light switch can prevent your dome light from turning on or off. The door doesn't have to be wide open for the light to come on. I was skeptical the first time I tried it. the dome lights still won't turn off unless i … When your car interior lights stop working, the best place to start is also the easiest fix. Is it possible that fixture needs to be R and R? A repair shop might do one of the following to fix it: Replace defective door switches or electrical components: One or more of your door ajar warning light switches may be broken or worn out, or could be causing a short in the system. When you push on the lens cover the aft light comes on and goes off fine. It sounds obvious, but having an open door is one of the most common culprits of a "door ajar" light. Start with the Dome Light or Dimmer Switch . An easy way to diagnose this is to turn your dome light switch to "ON" position. The dome light stays on all the time. Now the new dome light stays on when set to "door," and actually caused a total drain of my battery since I didn't catch it at first. I have made sure switch is off---At first light would stay on for period of time then turn off normally. Yay. Plug n play. Check to make sure that all doors are closed completely, as a door that's open just a slight amount can trigger this light… This can leave the interior lights in a state where they no longer come on when you open the door. The dome switch itself has been known to fail. Then the time for turnoff became longer and longer and now it simply stays on. The forward bulb on the drivers side stays on while driving. Inspected it and found out that the bulb was toasted and so was the actual dome light assembly, so I ordered a used dome assembly off of eBay and replaced it. Now its the first choice and not the last resort to fix one doing it. Check the wires connecting to your dome light lamp by removing the light bulb, pulling the connector out, and checking for any corrosion. 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