a capacitor. Take a cheap tester and try different slots on the fuse box and play with your ignition to see when it goes into accessory mode and the tester lights up. Go to the dealer and get a wire pin for your car(a 8 inch wire that slips into the fuse box slot)the goes into your fuse box and a 5-30 amp fuse(depending on your amp). just connect your power wire to the new wire going to the fuse box (should be an empty slot in your fuse box). My Arctic Silver 1998 740IL with Xenon PDC NAV Comfort & Convenient package
TV/ MP3/ DVD/ AUX/ DSP/ SES(voice recognition) CPT8000 with Sharkfin Antenna & rear side airbags