Can anyone tell me what this is?

[DylanQ]

It connects to this under the drivers seat.

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The small switch box on the lower right.

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[mararmeisto]

Somebody's re-wired the glow plug starter relay, it looks like.

[DylanQ]

thanks Paul. What would be the purpose of that?

[nxski]

That's the exact set-up I have. I assume it was installed by CVI. They are used to control tge glow plugs manually in case you want them to get a bit more juice, a bit less, etc. I had mine installed because Laurentiu installed glow plugs that were the wrong resistance in my vehicle so the ECU doesn't function properly.

[DylanQ]

Ah that makes sense. It must have been installed by CVI they did service it at some point. Thanks.