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I'm starting to plan a refresh on battery / charging / start wires and thought this info on the factory wire sizes might be useful to others. This was collected from the factory wiring diagram for a 2002 F-series pick up 7.3 powerstroke with factory dual alternators.
Please feel free to amend/add/correct.
Last edited by steelandspeed; Jan 12, 2024 at 11:14 AM.
Reason: Update
Keep it simple...
2/0 everywhere
Except...
Alternator feed is likely still way oversized at 1/0 but is nice and chunky to the eyes.
Starter feed 2/0 works, 3/0 maybe (MAYBE) better, but it is rush current to a small connector and does not make much difference.
DO NOT SOLDER THIS STUFF..
Proper crimpers on crimp fittings with adhesive heat shrink.
