diesellibrarian
SILVER Star
Looking at the electrical diagram for the FJ62, it looks like most of the circuits in the ECU ground to the right front pillar. Most of these actually tie in to a common ground bus located behind the gauge cluster. There are probably 12 or 14 grounds tied into this bus, and when it fails, weird things happen (failure can be due to corrosion or a short circuit burning one or more connections on the bus). The latter is what happened to me, and it caused my dash lights and headlamps to turn off spontaneously while driving. I'll see if I can find a picture of the location of the ground bus. Might be worth checking, anyway.
(Also, putting dielectric grease on threads as mentioned above won't help to get a good ground. Dielectric grease is non-conductive, so if anything it will make for a worse connection)
(Also, putting dielectric grease on threads as mentioned above won't help to get a good ground. Dielectric grease is non-conductive, so if anything it will make for a worse connection)