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Mechman high output alternators · Authorized dealer
A built 4Runner usually wears a winch bumper, a light bar, rock lights and an onboard air compressor, with a radio on the dash for trail chatter. Each one draws from the same charging system. A Toyota 4Runner high output alternator gives your trail rig the output to run them. This page covers 2003-2023 4Runners with the 4.0L V6 and 4.7L V8.
Trail loads come in bursts. Airing back up with an onboard compressor at the end of the day draws heavy current for several minutes. A winch pull draws even more, and most owners winch with the engine running so the alternator can help the battery. Rock lights, a light bar and a fridge add steady load on top. A Toyota 4Runner high output alternator shortens the time it takes to recover between those bursts, so the battery is ready for the next pull.
Enter your truck in the Make, Model, Year and Engine search above and you will land on one of three fitments. The 2003-2009 4.0L V6 and the 2003-2009 4.7L V8 use different series, and the 2010-2023 4.0L uses a third. Confirm your engine on older trucks, since both were offered in the same years. Then pick output:
On a dual-battery rig, the 320 amp unit gives both banks more charge for every hour on the road.
Both ratings are Mechman high output alternators, sold here by an authorized Mechman dealer.
Pair your Toyota 4Runner high output alternator with a vibration-resistant battery from our AGM batteries and a Big 3 kit from our amp wiring kits. On a rig that winches often, the Big 3 matters as much as the alternator, because thin factory cables limit how much current reaches the battery. Several of these series also appear on the page for Toyota's full-size pickup, and Tundra owners have their own page built around work trucks. Find other Toyota and Lexus fitments in our Toyota and Lexus alternator collection.
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