When the fuses become unlodged in the fusr box the gas gauge needle goes to empty and the car makes a hihh pitch sound. Once i turn it off the car will not start unless i go into the fuse box and repossible allthe fuses then put key in door lock turn key till doors are locked and all the windows go down then completely back up then i unlock doors and car will start again. I have had car put on disgnostic by mercedes and other dealers nothing shows up but car problem continues. This happens daily. The fuses do not blow they just will not stay lodged in the fuse brackets.