1987 v10 dome light, horn not working. I've got hot going to dome and checks out fine, ran continuity with multimeter on ground, and get a decent reading, assuming i'm reading multimeter correctly. I thought ground(orange/white running to dome) may be corroded running through door threshold, so I cut it by fuse box, pushed on horn...and nothing, so i assume that ground is fine....Checked ground cluster behind instrument panel, detatched , inspected connections, everything looks fine, no corrosion.... checked door/dome light switch on driver side, looks perfect