Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Is the relay continuing to click after taking care of the loose ground? Or does that still need to be addressed?
Start by removing any evidence of arcing and then re-tighten the loose ground.It isn't very uncommon for the smaller yellow wire to have some discoloration to it.
Without seeing what you're working with I can't say for sure but here is a power distribution circuit that might show you what you're looking at.
Measure the voltage between the engine and the negative battery terminal, the engine and both ends of ground strap and report back. It sounds like you have a bad engine ground.
Add one side of a pair of jumper cables between a good engine ground and the negative battery terminal. Do problems stop or continue? If they persist there is a short to power somewhere on that circuit if I'm understanding you correctly. If the problems stop then you have a bad engine ground. Simply make a new one! :)
Were you able to make any progress on this one?