Yes, you are correct about the various lighting systems are trying to ground through themselves from rear to the front grounds.
The is a rear lamps junction but my database does not indicated where it is located. Try to locate this junction box and check if it is contaminated thus causing grounding problems.
The main ground connection for the junction box which joins all the various circuit grounds is at left side of fuel tank. Check it too if you have not done so yet.
You can try attaching a remote ground from any of the lght grounds to test if it resolves the problem.
Monday, January 4th, 2010 AT 9:16 AM