Q: Unknown part

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There's an in line relay on the positive battery terminal cable that's grounded to the chassis and it's completely fried so much that it's melted to the case it is in. I need to replace it because it's causing all sorts of electrical problems but I can't find any information on what it's even called or where to get a new one/if it's even supposed to be on the car.

My car has a manual transmission.

There should not be any inline relay on the battery cable. This may be some sort of aftermarket theft system installed and should be removed. I would recommend having a mechanic like one from YourMechanic verify the relay is aftermarket and see why it got melted.

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