I did not see the Ignition Switch on the list.

You could connect a remote Starter Switch to the Starter (after the Ground and other wire connections have been cleaned).

If it starts OK like that all of the time with the Remote Starter Switch but does not start with the Switch removed; you have another Electrical issue.

In the mean time you can use the Remote Starter to keep you moving.

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84 300D, 82 Volvo 244Gl Diesel