How do I tell if my gem module is bad or fuse box? How do I tell if my gem module is bad or fuse box? - Answered by a verified Ford Mechanic got an electrical issue no power to inerior lights or wipers checked related relays and fuses all ok could a faulty GEM affect this ford 1998 pickup F150 ( GEM ) MODULE LOCATED ON 1998 ford f150 gem module | eBay Find great deals on eBay for 1998 ford f150 gem module. Shop with confidence. Skip to main content. eBay Logo: 98 Ford F-150 F-250 4x4 BCM GEM Multifunction Fuse Relay Box F85B-14B205-NA BY (Fits: 1998 Ford F-150) Pre-Owned. $179. F85B-14B205-PA TESTED 1998 Ford F150 GEM MULTIFUNCTION MODULE #A1053* See more like this.