The black walnut-sized sounds like a CUBE RELAY, commonly used for SAFETY switching on slides/ jacks, or other devices or lighting/ trailer lights. Common= 30a MAX contacts. You can even find a few in FUSE/RELAY Boxes for the chassis, for items such as FUEL PUMP, BUT you can also see similar (sometimes smaller, sometimes not) mounted on CIRCUIT BOARDS.
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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