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I am trying to fix an old '76 and while trouble shooting my brake lights I noticed a fat orange wire sticking out from the fuse block. I unscrewed the fuse block from the firewall and the wire was hooked to the heater fuse slot with another wire. My heater works and I was having ground problems with some of the other fuse positions (E-warning/brake light).
Question is, is the fuse block supposed to be grounded? Is this the ground wire? Will it hurt anything if I ground the fuse block with this wire? I know it's not a hot wire, I checked for that too and don't have another Ford to compare with either.
Tried to do a search for this but there are too many people on the site for the server to handle, hopefully one of y'all will answer my question.