Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956
Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956
Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956
Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956
Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956
Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956

Alternator For John Deere 9670 STS, 9770 STS, 9870 STS AH212040; BOS-1986A00956

Item #: BOS-1986A00956

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Overview

Item Number: BOS-1986A00956

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Item ConditionAftermarket Part
DescriptionAlternator
Lester12796
Volt12
Amps200
Mount Hole ID 110.500mm
Mount Hole 1 TypeUnthreaded
Mount Hole 2 TypeUnthreaded
Fan LocationInternal
Regulator LocationInternal
Terminal ID 2B+
Terminal 2 SizeM8x1.25
PolarityNegative

Applications List

Select Make & Type
MAKE TYPE MODEL YEAR ENGINE
John Deere Auto and Light Truck310SK TC JD 4.5L 102HP Ds
John Deere Auto and Light Truck410K TC JD 4.5L 106HP Ds
John Deere Auto and Light Truck9570 STS 414 Diese
John Deere Auto and Light Truck9570 STS 414 Diesel , Diese
John Deere Auto and Light Truck9670 STS 548 Diese
John Deere Auto and Light Truck9670 STS 548 Diesel , Diese
John Deere Auto and Light Truck9770 STS 548 Diese
John Deere Auto and Light Truck9770 STS 548 Diesel , Diese
John Deere Auto and Light Truck9870 STS 824 Diese
John Deere Auto and Light Truck9870 STS 824 Diesel , Diese
John Deere Auto and Light TruckS650 6-950 Diese
John Deere Auto and Light TruckS660 6-950 Diese
John Deere Auto and Light TruckS670 6-950 Diese
John Deere Auto and Light TruckS680 Hillmaster 6-1250 Diese
John Deere Auto and Light TruckS680 STS 6-1250 Diese
John Deere Auto and Light TruckT550 JD PT 6.8L Diese
John Deere Auto and Light TruckT560 JD PT 9.0L Diese
John Deere Auto and Light TruckW540 JD PT 6.8L Diese
John Deere Auto and Light TruckW550 JD PT 6.8L Diese
John Deere Auto and Light TruckW650 JD PT 9.0L Diese
John Deere Auto and Light TruckW660 JD PT 9.0L Diese

Replaces These Part Numbers

Arrowhead400-24137, B0124625030
Bosch0124625030, 0-124-625-030, 0124625030315
J&N Electrical Products400-24137
John DeereAH212040, AH229090, AXE17691, SE501826
Lester12796

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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