One thing you could do is take the fuse out and check it for small cracks. I've read here that there are often cracks that aren't visible without a very close inspection.

Do the relay prongs look dirty? If your car isn't starting I would check the plugs first, they are usually more likely to go than the relay.

If you have checked the plugs with a multi-meter, bear in mind that even when the plugs test OK, they frequently aren't. When I changed my plugs a few weeks ago the old ones tested fine but several weren't working well. The new plugs made a huge difference.

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Ralph

1985 300D Turbo, CA model
248,650 miles and counting...