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All connections good? Battery terminals clean and tight? Was there any modifications to the wiring harness to fit the new alternator. Sorry Strop, I can't remember which Patrol you have. If it has an ECU or ECU controlled alternator, maybe it needs to be reset? No fuses have blown?
Td42tdi 2003 so not ecu, I’ve checked everything even cleaned to earths and checked the battery terminals, only thing new is the sparky remade the wiring harness for the spotties as it was too light he said