Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747
Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747
Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747
Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747
Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747
Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747
Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747

Alternator For Caterpillar 312F, 312E, 313FL, 314ECR, 316EL Tractors; 400-12747

Item #: 400-12747

30-DAY RETURN POLICY

If your order arrives and it’s not exactly what you want, you may return it within 30 days for a refund. We know that people sometimes order a part and then discover it’s not exactly the one they need for the repair. We understand and want to work with you. Just make sure the item is in its original packaging and in good condition free of damage.

When a returned product comes back to us, we’ll check it over to make sure it’s in ‘Like New’ condition and free from damage such as dents, scratches, cracks, abuse, defacement or indication of removed screws/fasteners or seals. Return processing may take up to 5 business days from the time your product is received by DB Electrical.

To return a product, simply click here to start the process.

Order today to get this price.

$237.93
Next Day Air Shipping for
Order today and ships out next business day.
Order in the next hrs mins secs
Mechanics Choice: OEM performance at a money-saving price.
  • 100% New aftermarket unit built to meet OEM specifications
  • 1-year warranty protects you after your purchase
  • Factory direct pricing with no middleman markup delivers exceptional value
Check if this fits your vehicle
HOW TO FIND YOUR FITMENT
Two ways to ensure proper fitment
DO YOU KNOW YOUR
OEM PART NUMBER?
Look for your OEM part number below or use our search tool.
LOOK FOR YOUR
MAKE/ MODEL/ YEAR
Enter your make/model/year below to find the right part.
  • Product Info
  • Applications List
  • Part Replacement List
  • Policy Information
  • Reviews

Overview

Item Number: 400-12747

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Item ConditionAftermarket Part
DescriptionAlternator
FamilyDelco 13SI
Volt24
Amps85
Regulator Clock3:00
Rotation DirectionClockwise
Mount Hole ID 110.700mm
Mount Hole 1 TypeUnthreaded
Mount Hole ID 212.600mm
Mount Hole 2 TypeUnthreaded
Mount Hole ID 310.700mm
Mount Hole 3 TypeUnthreaded
Mount Hole ID 412.600mm
Mount Hole 4 TypeUnthreaded
Mounting Ear Thickness3.150"/80mm
Mounting Ear 2 Thickness3.150"
Mounting Ear 2 Thickness80mm
Mounting Ear 3 Thickness3.150"
Mounting Ear 3 Thickness80mm
Mounting Ear 4 Thickness3.150"
Mounting Ear 4 Thickness80mm
Fan LocationInternal
Regulator LocationInternal
Terminal ID 2B+
Terminal 2 SizeM8x1.25
Terminal ID 3D+
Terminal 3 SizeM5x0.8
Terminal ID 4W
Terminal 4 SizeM5x0.8
PolarityNegative
Number Of Grooves8
Groove OD2.370"
Groove OD60.200mm
Pulley TypeSolid
Pulley Outer Diameter2.543"
Pulley Outer Diameter64.600mm

Applications List

Select Make & Type
MAKE TYPE MODEL YEAR ENGINE
Caterpillar 312E
Caterpillar 312F
Caterpillar 313FL
Caterpillar 314ECR
Caterpillar 314ELCR
Caterpillar 315FLCR
Caterpillar 316EL
Caterpillar 318D2L
Caterpillar 318EL
Caterpillar 318FL
Caterpillar 320D2GC
Caterpillar 320FL
Caterpillar 323FLN
Caterpillar 323FOEM
Caterpillar C4.4
Caterpillar C7
Caterpillar C7.1
Caterpillar CP54B
Caterpillar CP54BLRC
Caterpillar CS54B
Caterpillar CS54BLRC
Caterpillar CS64BLRC
Caterpillar M315D2
Caterpillar M317D2
Caterpillar M320D2
Caterpillar M322D2
Caterpillar M322D2MH
Caterpillar M324D2MH

Replaces These Part Numbers

Arrowhead400-12747
Caterpillar321-8932
Delco8600366

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

WARNING: California’s Proposition 65

Recommended Products

Keeping customers satisfied for over 35 years.

Customers keep returning because we keep delivering total satisfaction. Our key to success is selling parts that fit and perform like the originals. It's why so many mechanics make us their top choice.

  • Find The Right Part

    Use our advanced part finder or search by part number to find your part.

  • Same-Day Shipping

    Orders placed by 2pm EST will ship that same day.

  • Fast, Free Delivery

    Orders over $50 shipped FREE to the 48 adjoining U.S states.

  • Expert Advice

    Need help choosing your part? Please contact us for help.

Back To Top