Auxiliary Underhood Fuse/Relay Box - 1991 300ZX Z32

The Nissan Z32 300ZX utilizes the auxiliary underhood fuse/relay box (Nissan 24330-40P00 or superseded 24330-30P01) mounted on the driver's side strut tower. This ABS plastic enclosure houses critical power distribution for VG30DETT twin-turbo models, including fuel pump, ECCS, and cooling fan relays alongside fusible links. When sourcing from 1990-1996 donor vehicles, verify mounting tab integrity—common failure points after decades of heat cycling and vibration. Inspection should focus on terminal corrosion within the multi-pin connectors and fusible link continuity using a multimeter. Installation requires careful torque on heavy-gauge battery cable terminals to avoid cracking plastic bosses, plus application of dielectric grease to prevent future oxidation and ensure weather seals are intact. Note that while 24330-30P01 and 24330-40P00 interchange physically, VG30DE naturally-aspirated models may lack specific turbo control relay sockets or use different internal bus bar configurations. JDM Fairlady Z units fit but may feature alternate fuse ratings. Always match casting marks "24330" embossed on the housing bottom for positive identification.