On my Jeep Grand Cherokee 2000almost all the electrical system is not working. Interior lights, locks, windows. Also sometimes all the lights on the Dash board turn on and the Gauges stop working, even the AC compressor. The code that I get from the car computer is P-1686 and P-1687. Do you know what can be the problem?

SOURCE: 1996 Jeep Grand Cherokee Electrical problem

You may want to have the wiring harness inspected. A major section under the fuse box(hood on 96 GC 4.0) may become chafed by a close proximity AC gas hose connector. My mechanic said it was slowly chewing at the harness. It caused me fuel pump problems, but your intermittant problem could be similar.

SOURCE: serpintine belt

This link will take you to a picture of the diagram. If the link doesn't work contact me and I can email you the picture directly.

http://autorepair.about.com/library/illustrations/bl506a-lib.htm

SOURCE: 2004 Jeep Grand Cherokee - problem with power windows/locks

This seems to be the affects of a bad dinamo charging your battery . If you take a appart the dinamo you should fine a part called in mechanic terms "the bones" they look like 2 black magnets with a wire coming out of them . They are not expencive and you should not change your dinamo untill you try this first a car dinamo is very expencive .

SOURCE: 2005 jeep grand cherokee ac blows cold only on drivers side

I agree, these vehicles have a problem with the blend doors and since the accuators hit the door when it opens and closes, it breaks the doors. and it's a huge job to replace them.

SOURCE: The interior lights for my 1996 jeep grand Cherokee Laredo

Hello and welcome to FixYa
The interior lights wont turn off cant because it can't get a conncetion definitely a headlight switch issue common problem for that make
Part # 05137535AA Headlight Switch Probably a dealer item very simple to change this yourself. Hope this gets you going.Please Rate Me. And you can always Ask Me.