Alternator for John Deere 670 770 790 870 970 990 1070 2305 2320
Alternator for John Deere 670 770 790 870 970 990 1070 2305 2320
Alternator for John Deere 670 770 790 870 970 990 1070 2305 2320

Alternator for John Deere 670 770 790 870 970 990 1070 2305 2320

Item #: 400-58016

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DB Electrical alternators are highly engineered for excellence in performance.
  • Built to Beat the Heat: High temperature epoxy and high temperature grease withstand extreme heat
  • Heavy-duty rectifiers and high-quality regulators enhance superior charging performance
  • Most alternators are supplied with final test results and performance curve
  • Direct-fit replacement and easy installation made possible with OEM fitment specifications
  • Factory direct, money-saving alternator typically priced substantially less than OEM counterparts
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  • Product Info
  • Applications List
  • Part Replacement List
  • Policy Information
  • Reviews


DB Electrical Alternators
DB Electrical keeps vehicles of every shape and size moving forward – from mowers, motorcycles and ATVs to automobiles, tractors, pickups and large commercial trucks. We work directly with factories to ensure each component is manufactured to our exacting quality control standards. But because there is no middleman, we can offer these exceptional-quality electrical components at low factory direct prices.

With DB Electrical alternators, you’ll get …

  • Superior Quality Every Time – Our aftermarket alternators deliver performance that’s equivalent to the original.
  • Direct-Fit OEM Replacement Parts – DB Electrical aftermarket alternators are designed for perfect fitment to replace the ones that originally came with your vehicle.
  • Engineer-Tested Excellence – Our alternators go through a rigorous testing program to ensure optimal performance. Most alternators are supplied with their final test results and performance curve.

Reasons to choose DB Electrical for your next alternator:

  • Built to Take the Heat – Most DB Electrical alternators offer high-temperature epoxy, heavy-duty rectifiers, high-quality regulators, top-quality bearings and high-temperature grease for better charging and longer life under high-heat environments.
  • Depth of Inventory – Find both common and hard-to-find alternators for virtually any type of vehicle to travel over road, trail or water.
  • Brand New Alternator – Never settle for a secondhand one. Many places will try to sell you a used alternator for about the price we’ll sell you a new one.

The DB Electrical Advantage – 1-Year Warranty
DB Electrical delivers exceptional value for products that we stand behind with our total-confidence 1-year warranty. Yes, you have a full year to make sure your alternator meets your expectations.

Item Number: 400-58016

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Item ConditionAftermarket Part
Unit TypePM Alternator
Part TypeUNIT
FitsJOHN DEERE 670, 770, 790, 870, 970, 990, 1070 COMPACT UTILITY TRACTORS

Applications List

Select Make & Type
JOHN DEERETractor10701989Yanmar 4TN84 Dsl
JOHN DEERETractor10701990Yanmar 4TN84 Dsl
JOHN DEERETractor10701991Yanmar 4TN84 Dsl
JOHN DEERETractor10701992Yanmar 4TN84 Dsl
JOHN DEERETractor10701993Yanmar 4TN84 Dsl
JOHN DEERETractor10701994Yanmar 4TN84 Dsl
JOHN DEERETractor10701995Yanmar 4TN84 Dsl
JOHN DEERETractor10701996Yanmar 4TN84 Dsl
JOHN DEERETractor2305AllYanmar 24.1HP Dsl
JOHN DEERETractor2320AllYanmar 24.1HP Dsl
JOHN DEERETractor2520AllYanmar 26.4HP Dsl
JOHN DEERETractor4010AllYanmar 18.5HP Dsl
JOHN DEERETractor4100AllYanmar 20HP Dsl
JOHN DEERETractor4110AllYanmar 20HP Dsl
JOHN DEERETractor4115AllYanmar 24HP Dsl
JOHN DEERETractor6701989Yanmar 3TNA72 Dsl
JOHN DEERETractor6701990Yanmar 3TNA72 Dsl
JOHN DEERETractor6701991Yanmar 3TNA72 Dsl
JOHN DEERETractor6701992Yanmar 3TNA72 Dsl
JOHN DEERETractor6701993Yanmar 3TNA72 Dsl
JOHN DEERETractor6701994Yanmar 3TNA72 Dsl
JOHN DEERETractor6701995Yanmar 3TNA72 Dsl
JOHN DEERETractor6701996Yanmar 3TNA72 Dsl
JOHN DEERETractor7701989Yanmar 3TN82 Dsl
JOHN DEERETractor7701990Yanmar 3TN82 Dsl
JOHN DEERETractor7701991Yanmar 3TN82 Dsl
JOHN DEERETractor7701992Yanmar 3TN82 Dsl
JOHN DEERETractor7701993Yanmar 3TN82 Dsl
JOHN DEERETractor7701994Yanmar 3TN82 Dsl
JOHN DEERETractor7701995Yanmar 3TN82 Dsl
JOHN DEERETractor7701996Yanmar 3TN82 Dsl
JOHN DEERETractor790AllYanmar 27HP Dsl
JOHN DEERETractor8701989Yanmar 3TN84 Dsl
JOHN DEERETractor8701990Yanmar 3TN84 Dsl
JOHN DEERETractor8701991Yanmar 3TN84 Dsl
JOHN DEERETractor8701992Yanmar 3TN84 Dsl
JOHN DEERETractor8701993Yanmar 3TN84 Dsl
JOHN DEERETractor8701994Yanmar 3TN84 Dsl
JOHN DEERETractor8701995Yanmar 3TN84 Dsl
JOHN DEERETractor8701996Yanmar 3TN84 Dsl
JOHN DEERETractor9701989Yanmar 4TN82 Dsl
JOHN DEERETractor9701990Yanmar 4TN82 Dsl
JOHN DEERETractor9701991Yanmar 4TN82 Dsl
JOHN DEERETractor9701992Yanmar 4TN82 Dsl
JOHN DEERETractor9701993Yanmar 4TN82 Dsl
JOHN DEERETractor9701994Yanmar 4TN82 Dsl
JOHN DEERETractor9701995Yanmar 4TN82 Dsl
JOHN DEERETractor9701996Yanmar 4TN82 Dsl
JOHN DEERETractor990AllYanmar 4TNE84 Dsl

Replaces These Part Numbers

ARROWHEADAPM0008, 400-58016
JOHN DEEREAM877957, AM880339

Frequently Asked Questions

Q: Do I need a larger charge wire for a High Output unit?
A: The high amp unit will operate better than stock, but not to its full potential without a larger charge wire. It’s the same reason firetrucks do not use garden hoses. It is IMPARATIVE to have proper charge and ground cables.

Q: Does a High Amp unit cause any damage to my battery or my vehicles charging system?
A: As long as it is installed properly with battery in good condition, then no. A High Output unit works exactly like a factory unit and only produces what is being demanded. No alternator works continuously at full output. Higher amperage is not bad and will not hurt a battery, but high voltage will blow one up.

Q: Will aftermarket underdrive pulleys (crankshaft power pulley) have any effect on my alternator?
A: Yes, underdrive crankshaft pulleys slow all the components (power steering, a/c, and alternator) to provide more power to the rear wheels. In some cases, the charging systems will fall totally on the battery at idle and completely stop charging.

Q: Where is the best place to get a voltage reading of the alternator output?
A: You’ll get the most accurate voltage reading from the back of the alternator at the main charge post that runs directly to the battery. This must be done while the vehicle is running.

Q: Why is the pulley on a high amp alternator smaller than my stock pulley?
A: The smaller pulley advances the power curve of the alternator just slightly, which produces a little more amperage around the idle if needed.

Q: Will I need a smaller belt for my high amp unit?
A: This varies by application because not all belts and belt tensioners are in the same condition. The tensioner will always tell you if you need a new belt or not. If it’s in range, you will not. If it is out, you will. Generally, you will need a belt that is one inch shorter than stock. You should have no problem finding a replacement wherever you buy your parts. V belt applications simply re-adjust your belt tensions to 3/8” deflection.

Q: What is the difference between a one wire, self-exciting and a self-energizing regulator?
A: Nothing. They are all exactly the same. Different manufacturers use different terms for marketing. The only wire to hook up is the charge wire to the battery. This does require modification for the alternator charge light on the dash.

Q: My stock unit used a five-groove pulley, and you sent my high amp alternator with a 6 groove. Why and what can I do?
A: 5 groove overdrive pullies are not produced. Install the belt on the back groove of the pulley closest to the fan or body of the alternator. The fan is internal, and this application will work just fine.

Q: Can your alternator be run in dual or triple alternator applications?
A: Yes. When wired and mounted correctly, the alternator can run in either dual or triple applications.

Q: Will I need a new battery with a high amp alternator?
A: If your battery is in good condition, and in spec of its OEM rating, then no. Your battery should work equally well with either the OEM and a High Amp unit.

Customer Reviews

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