Amazon: Fuse Boxes - Fuses & Accessories: Automotive Online shopping for Fuse Boxes - Fuses & Accessories from a great selection at Automotive Store. Online shopping for Fuse Boxes - Fuses & Accessories from a great selection at Automotive Store. 6 Circuits with Negative Bus Fuse Box for Car Boat Marine RV Truck DC 12-24V, Fuses Included. by WUPP. $20 $ 20 98. See Details. FREE Shipping on How to Wire Accessories to Car Fuse Panels | It Still Works If installing an amplifier, car stereo or other automotive accessory, the user guide or manual should state the proper fuse size to use with the device. In most cases, using a 10-amp or 20-amp fuse should suffice for accessories. The fuse size dictates how much amperage can pass through the circuit before the fuse fails or "blows".