My '87 MJ DD 2.5 has had an electrical gremlin. I recently replaced clutch slave, plate and pilot bearing. MJ ran great but a week later it would die for no reason while driving only to restart an hour later. Finally no power to most of fuseblock and ignition switch. In troubleshooting, I removed the windshield wiper tank and moved the wiring harness enough that relays clicked and I then had power to fuseblock. I put wiper tank back in place and again lost power to fuseblock. I was finally able to separate the fuseblock from the firewall only to find this thick black tar on all of the electrical connections. 5 years ago, I had the clutch master cylinder leak onto fuseblock which corroded the fuse connections which was solved by replacing all of the fuses. Could this tar have been dissolved from the brake fluid leakage and gradually seeped into the firewall connector keeping the fuseblock from making a good circuit? I now am trying to clean all of these connections of this tar to see if this is my gremlin. Suggestions? I am approaching 400k on this baby and need her running.