Isuzu D-MAX RC 4JJ1 Upgraded Alternator Kit (BKS-240DMAX)
Upgrade your Isuzu D-MAX RC 4JJ1 charging system with the BKS-240DMAX Upgraded Alternator Kit, built to deliver far more charging capacity for vehicles running demanding electrical accessories. Whether you are powering a dual battery setup, off-road lighting, a winch, an air compressor, a fridge or touring equipment, this high-output kit provides the headroom the factory alternator does not have. The alternator puts out 240A cold and around 217A hot, through a 7PV fixed pulley on a 17mm shaft, with an internal LIN regulator so it talks to the vehicle the way the factory unit does. It is a direct replacement in the original mounting location. The harness matters as much as the alternator. Factory cabling was never sized to carry 240A, and reusing it is the most common reason an upgraded alternator does not deliver what it is rated for. The kit includes upgraded cable with the lugs already labelled, plus a 250A mega fuse and holder on a bracket, so the extra output actually reaches the battery instead of being lost as heat in undersized wire. Check your engine before ordering. This kit is for the 4JJ1. If you have the later RG D-MAX with the 4JJ3-TCX engine, we build the same kit for it: Isuzu D-MAX RG 4JJ3 240A Upgraded Alternator Kit → Identical kit and the same alternator. Only the fuse bracket and the cable lengths differ, to suit the 4JJ3 engine bay. Backed by a 2 year or 25,000km manufacturer warranty.