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Keep your battery charged with a reliable Alternator from FridayParts. Enjoy fast delivery & global shipping.
When you're running long days in the field and your alternator starts acting up—dim lights, slow cranking, or that warning light that won't quit—you need a reliable replacement that'll keep your operation running without breaking the bank. This MAHLE-manufactured 70-amp alternator delivers the dependable charging power your tractor needs, whether you're pulling a disc through tough soil or powering hydraulics on a loader all day long. What You're Getting Solid 70-amp output that handles modern electrical demands without overworking the charging system 14-volt design maintains proper battery charge and keeps all your electrical systems running strong MAHLE quality construction engineered specifically for agricultural applications Direct replacement that fits multiple brands—saves you time hunting for brand-specific parts Built for Real Farm Work This alternator works across a wide range of tractors from utility models up to larger row-crop machines. Whether your Massey Ferguson is running a bush hog, your Ford New Holland is pulling implements, or your Case IH is doing loader work, this unit keeps the electrical system healthy through whatever work you throw at it. Made to Last MAHLE doesn't just rebadge generic alternators—they engineer them for the tough conditions farm equipment faces. The sealed housing keeps dust and moisture out, while quality bearings handle V-belt tension without premature wear. The internal voltage regulator maintains steady output whether you're idling while hooking up implements or running at PTO speeds. Installation Notes Before installing your new alternator, check why the old one failed—worn belts, corroded connections, or a bad battery can kill alternators prematurely. Clean the mounting area and verify proper belt alignment to prevent future problems. After installation, test the system with a voltmeter; you should see 13.8-14.4 volts at moderate RPM.
Kits listing this number
Sold as a complete set — a repair kit for 3933142M91, or a set that includes it. The price shown is for the set.
If you're tired of that old generator barely keeping up with your electrical demands, it's time for an upgrade. When you're running lights for early morning chores or powering modern accessories, that vintage generator just can't deliver the juice you need. This complete conversion kit transforms your tractor's charging system from outdated to dependable, giving you the power to run everything from work lights to GPS units without worrying about a dead battery. What You're Getting Complete kit with alternator, mounting brackets, and all hardware needed Modern alternator that charges properly at all RPMs, not just high speeds Built-in voltage regulator eliminates those troublesome external regulators Higher amperage output supports additional electrical accessories Universal design works with hundreds of tractor models across multiple brands Built for Real Farm Work This kit fits a wide range of tractors from Massey Ferguson, Ford, Case IH, International, and other brands that came with generators from the factory. Whether you're running a utility tractor around the barnyard or a bigger machine in the field, this conversion gives you the reliable charging power modern farming demands. Made to Last Farm equipment takes a beating, and this alternator is built to handle it. Heavy-duty bearings rated for agricultural use stay sealed against dust and moisture. The solid-state internal regulator eliminates the contact points that always seem to fail in old mechanical regulators. Quality brushes and slip rings keep delivering consistent power season after season. Installation Notes This universal kit replaces hundreds of different part numbers, so chances are good it'll work on your tractor. Installation typically takes 2-3 hours with basic tools. You might need to drill new mounting holes or adjust bracket positions compared to your old generator setup. The built-in regulator simplifies wiring - most jobs only need the main output wire and a switched ignition connection. Take your time with belt alignment and tension for long alternator life.


