Instrument panel

Hi, Was talking about 3 prong part that plugs in to cluster.not under the hood.
Took fuse block out have power to inst. fuse on one side.

notice a lot of surface rust on backside connections of fuse block.
do have wiring schematic.

Will clean up connections and see what happens.
Thanx

that 3 prong part is a VR, or voltage limiter.