02 Jeep Grand Cherokee Limited/ intermittent electrical issues
My 02 Grand Cherokee Limited started experiencing some type of electrical problem the other day. The gauges will go go up and down, the relays will all click on and off and the idle fluctuates but continues to run. After a whil, it will stop and everything will start working properly. Then when I hit a bump or make a turn it may happen again. It is clearly a short or bad ground but I am trying to isolate the possible location. The problem seems to effect all electrical functions of the vehicle simultaniuoulsy, however, the vehicle does not quit running. Sometimes all of the gauges will work until I try to turn on the headlights or heater. Then everything will turn on and off very rapidly. Today on my way to work it was working fine. I stopped for a coffee and when I returned to the jeep it was messed up again and I could not turn on the lights or the heater without causing the problem. When I turned them off the gauges returned to normal operation and I went on my way. I decided to pull over and check some things to see if I could get it working again. as I came to a stop and put the vehicle in park the heater came alive and it seemed as if everything was working properly. When I got out and looked at the vehicle I noticed that the driver side headlight was not lit up and also the driver side turn signal did not work at all when I flipped the switch, no signal, no sound, no indication. Also at that time the RPMs were fluctuating. It may be like this for a while and then later it will either stop working completely or start working completely. Yesterday I noticed that the situation was reversed. ALl of the driver side lights worked and the passenger side was out. I pulled the bottom of the dash apart and vigerously inspected the wiring lol. I hit things and manipulated wires while it was working and could not get it to fail. I stopped for a cigarette break and while I was standing next to the vehicle it started malfunctioning. I could not get it to stop as I went through the harnesses and bundles again. About 10 minutes after I finished I was sitting in the driver seat contemplating my next move when everything came alive and started working again. I am feeling like this situation has got to be related to the wiring/ground for dashboard components. I just can not seem to find the faulty connection. I also have been unable to locate the common ground for the dash. The jeep has a 4.7l engine, fully loaded. The stereo system from when I purchased the car is aftermarket. The power for the stereo is run directly to the battery and is never effected by any of these symptoms. I have also noticed that the headlights are aftermarket HID lights. I have tried disconnecting them from the power to see if the problem persisted and it did not make a difference.