If the fuse holder contact is gone, you need a new one. Im not sure if you can just buy one, or a whole new fuse box. If you have to buy a new fuse box, I would get one from a junkyard if you want to save money. Also, I recommend replacing all the fuses with glass type fuses with metal end caps. They dont corrode as easy unlike the stock fuses which have the fuse material on the outside.

For the alarm, if you want to disable it, locate the alarm system control module and cut the wires or whatever has to be done to disable it.

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1985 Mercedes 190E 2.3(Sold)