Check the Fuse Chart in the lid of the Fues Box.

No chart, pull the Fuses one even if not burned and check the tip of the Fuse and were it makes contact with the Fues Holder Bracket.

You can use a Test Light to probe around the Electrical Connector to see if it is even getting Voltage but a Digital Volt/Ohm/Multimeter will give you more information. Chea at Harbor Freight Stores.

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84 300D, 82 Volvo 244Gl Diesel