Fuse box, battery box. Reference number(s) OE: 1J0 937 617 D, 1J0 937 550, 1J0 937 550 AA, 1J0 937 550 AB, 1J0 937 550 AC, 1J0 937 550 AD, 1J0 937 937 550 AD. 50 AE, 1J0 937 550 AF, 1J0 937 550 AG. If the fuse box corrodes, it prevents field current to the alternator. If you only rely on the battery voltage test, the alternator is tested as a defective alternator. Change the alternator, it still cannot be charged normally. Check the alternator fuse first. The high amp power flows through the fuse holder and then reaches the positive pole of the battery. If the fuse holder has signs of corrosion, thermal deformation or melting of the insulation, the heat also burns the fuse terminals. Check if the fuse box is corroded. If there are signs of corrosion, thermal deformation, melting of the insulation or damage to the fuse, replace the entire fuse holder. Perform a voltage drop test. The voltage drop under load should be close to 0 volts. A voltage drop of more than 0.30 volts indicates too high a resistance. In this case, replace the fuse box.

Technical Details Manufacturer: ‎NSGMXT Brand: ‎GELUOXI Item Weight: ‎320 g Package Dimensions: ‎16.4 x 12.2 x 5.4 cm; 320 g Item model number: ‎1J0 937 550 Manufacturer part number: ‎1J0937617D 1J0937550AD Additional Information ASIN: B01FFF9WEE Date First Available: 27 May 2016