Alternator for Marine Applications Replaces Prestolite
Alternator for Marine Applications Replaces Prestolite
Alternator for Marine Applications Replaces Prestolite
Alternator for Marine Applications Replaces Prestolite
Alternator for Marine Applications Replaces Prestolite
Alternator for Marine Applications Replaces Prestolite
Alternator for Marine Applications Replaces Prestolite

Alternator for Marine Applications Replaces Prestolite

Item #: 400-20012

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.

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DB Electrical marine alternators excel for powering watercrafts.
  • 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
  • Plated fans, pulleys and hardware protect against rust-producing dampness
  • Marine alternators meet SAEJ1171 certification for use on boats and jet skis
  • Factory direct, money-saving alternator typically priced substantially less than OEM counterparts
Check if this fits your vehicle
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  • Product Info
  • Applications List
  • Part Replacement List
  • Policy Information
  • Reviews

Overview

DB Electrical Alternators
DB Electrical keeps watercrafts moving forward with quality aftermarket alternators. 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.
  • Corrosion Resistance – Plated fans, pulleys and hardware offer protection against rust-producing dampness.
  • Flame Arrestor Screens – Where applicable, alternators come with these screens to meet Marine SAEJ1171 Certification as laid out by the SAE.
  • 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: 400-20012

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Critical Note
Item ConditionAftermarket Part
Part TypeUNIT
Voltage12
RotationCW
RegulatorIR
FitsMARINE APPICATIONS
Delco 10SI Style Conversion Unit to Replace Prestolite and OMC units

Applications List

Select Make & Type
MAKE TYPE MODEL YEAR ENGINE
OMC100 100H1972, 1973
OMC120 120H1967, 1968, 1969
OMC120 120H1969, 1970, 1971, 1972, 1973, 1974
OMC120 120H1975, 1976, 1977, 1978, 1979, 1980, 1981
OMC140 140H1973, 1974
OMC140 140H1975, 1976, 1977, 1978, 1979, 1980, 1981
OMC155 155H1967, 1968, 1969
OMC155 155H1969, 1970, 1971, 1972
OMC1551966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974
OMC165 165H1972, 1973, 1974
OMC165 165H1975, 1976
OMC170 170H1974
OMC175 175H1975, 1976, 1977
OMC185 185H1967, 1968
OMC185 185H1978, 1979, 1980
OMC190 190H1974
OMC190 190H1975, 1976, 1977
OMC200 200H1967, 1968
OMC200 200H1979, 1981
OMC210 210H1967, 1968, 1969
OMC210 210H1969, 1970
OMC215 215H1971
OMC225 225H1972, 1973, 1974
OMC225 225H1975, 1976, 1978
OMC230 230H1979, 1980, 1981
OMC235 235H1971
OMC235 235H1975, 1976, 1977
OMC240 240H1978
OMC245 245H1972, 1973, 1974
OMC245 245H1975
OMC250 250H1979
OMC260 260H1979, 1980, 1981
OMC5.0L 8cyl 305ci 5.0L G1980, 1981
OMC5.7L 8cyl 350ci 5.7L G1980, 1981
OMC7.4L 8cyl 454ci 7.4L G1980, 1981
OMC80 80H1967, 1968, 1969
OMC80 80H1967, 1968, 1969
OMC90 90H1970, 1971

Replaces These Part Numbers

ANDRE NIERMANN0247271
API MARINE20030, 20031, ALT30
ARCO MARINE40152
ARROWHEADADR0120, 400-20012
BARSANCO140-7317
DIXIEMA-505
EMS7320N
J&N Electrical Products400-20003R
LESTER7315, 7317, 7320, 8901
MES MOTORCYCLE & MARINE3140M-D, 7315, 7317, 8901
OMC381166, 381519, 383433, 383443, 384233, 981186, 981187, 985964
PRESTOLITE51-271, 51-284, ALK5206, ALK6207, ALK6210, ALK6210A, ALK6222, ALK6222A, ALK6222AY, ALK6222AYS, ALK6222Y
SIERRA MARINE18-5964
WAI1-2834
WILSON90-06-1020M

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

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