Door Ajar Light Keeps Coming On

I have a 96 Ford Ranger.
It keeps beeping indicating that the door is ajar. When it really is not. This problem comes and goes. Also, recently, the dome light will flick on for a minute. Also, The
headlights flicker on for about 10 seconds the other day, and then came back on.
What do all these problems mean, How do I resolve this problem?
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tim wrote:

This is a common problem with mid-late 90's Rangers. Simple solution is to thoroughly spray the door latches with WD-40 while opening/closing doors. The switch gets gummed up and does not operate properly.
Dealers are well aware of the problem and unfortunately you may have to replace the switches.
Yet another $.02 worth from a proud owner of a 2001 Ford Ranger 4x4 and a 1970 Mach 1 351C @ http://community.webshots.com/album/18644819fHAehGJAjt
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Thanks Grover. I will give this a try.

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Grover,
After trying this it has not beeped yet! You are the man!

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A bill for services will be arriving soon ;-)
Yet another $.02 worth from a proud owner of a 2001 Ford Ranger 4x4 and a 1970 Mach 1 351C @ http://community.webshots.com/album/18644819fHAehGJAjt
tim wrote:

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