PLEASE NOTE - Some products are not immediately available. If your order will be delayed, we will e-mail you or call you and let you know.
E-MAIL US HERE about availability and we will respond quickly! We ship same day if your order was placed by 1:00 PM EST during normal business hours BASED ON AVAILABILITY.
NEXT DAY SHIPPING NOTE - Please see our Shipping Policy SATURDAY OR SUNDAY DELIVERY IS NOT AN OPTION.

WE ARE CLOSED ON MONDAY, MAY 27th IN OBSERVANCE OF MEMORIAL DAY AND WILL RESUME NORMAL BUSINESS HOURS ON TUESDAY, MAY 28th
ALL ORDERS PLACED THIS WEEKEND AND ON MONDAY WILL BE PROCESSED ON TUESDAY, MAY 28th
THANK YOU TO ALL OUR ACTIVE AND RETIRED SERVICE MEN AND WOMEN FOR YOUR CONTINUED SACRIFICE TO KEEP THIS COUNTRY SAFE AND FREE. MAY GOD BLESS YOU ALL!
PLEASE HAVE A SAFE MEMORIAL DAY WEEKEND FROM ALL OF US AT MY INBOARD MARINE!

Alternators

Some alternators are grounded through the mounting bracket so be sure to clean the mounting surface of any paint, rust or corrosion.

Note: Alternators are bi-rotational & work for right hand or left hand rotations and it is not recommended to paint your replacement

Fun Facts: Marine versus Automotive Alternator

Fuel-efficiency via weight reduction is a primary goal for automotive design. Thus, modern vehicle alternators are made from lighter materials, sized for small batteries and minimal electrical loads. They will not sustain high loads without external airflow for cooling.

Industrial alternator applications require continuous-duty, high-output alternators built to last while operating safely. Marine alternators, for instance, have higher power demands than regular cars and trucks to run lights, radio transceivers, navigating equipment, AC/DC inverters, water makers, pumps, winches and other high-amperage devices. 

Additionally, marine engines are often installed in enclosed compartments to shelter them from moisture and salt spray. This means that marine alternators must be self-cooling at high loads or have an additional cooling subsystem. Marine alternators also comply with strict safety specifications not required of cars.

Marine Alternator Features

In order to meet these demands, alternators built for marine use have features not found in automotive-grade units:

  • Spark screens that meet U.S. Coast Guard standards to eliminate the alternator as an ignition source
  • Double-insulation to eliminate electrical shock in wet conditions and prevent sparks
  • Dual fans and large heat sinks for self-cooling under high, continuous loads
  • Stainless steel bearings, corrosion-resistant metals and heavy-duty coatings
  • High output at low RPMs to match marine diesel engine operating conditions
  • Battery sensing regulators for high-efficiency battery charging and detection of battery cell failure.
    Alternator 100 Amp PCM Marine 5.7L - 6.0L With 6 Groove Pulley OEM RA097009
    16%
    $373.33 $445.40
    100 Amp 12 Volt Original PCM Alternator with 6 Groove Pulley PCM Alternator 100A for most  5.7L and 6.0L engines OEM Not Aftermarket! PCM Part...
    Alternator 55 Amp Internal Regulator GM Yellow Lead PCM And Indmar 1/2" V-Belt Pulley Alternator 55 Amp Internal Regulator GM Yellow Lead PCM And Indmar 1/2" V-Belt Pulley
    17%
    $236.00 $283.34
    GM Alternator 55 Amp 12 volt with yellow lead RA097006A Replaces the old 51 Amp Style Alternator with a 1/2" pulley! Replaces 51 Amp Up...
    Alternator 55 Amp Internal Regulator Yellow Lead PCM And Inmar <b>3/8" </b>V-Belt Pulley Alternator 55 Amp Internal Regulator Yellow Lead PCM And Inmar <b>3/8" </b>V-Belt Pulley
    7%
    $259.40 $278.19
    Alternator 55 Amp 12 volt with yellow lead - RA097006 Replaces the old 51 Amp Style Alternator with a 3/8" pulley! Replaces Indmar 75-5024 &...
    Alternator 70 Amp 5.7L DELCO-BOSCH-6.0L Factory Original PCM And Indmar RA097007C
    19%
    $298.76 $370.00
    New 70 Amp Delco Style Marine Alternator With Serpentine Belt Pulley Fits 2004 & Prior PCM - Most PCM 2005 and up had a 100...
    Alternator 70 Amp DELCO Remy Style Inboard Alternator Late Model OEM ARCO 20820
    9%
    $284.97 $312.86
    Late model 70 amp Delco Remy style alternator with 2 in. mounting foot and 65 mm serpentine pulley fits various marine engines. New 70 amp...
    ALTERNATOR 70 AMP DELCO REMY STYLE INBOARD ALTERNATOR OEM ARCO 20825 ALTERNATOR 70 AMP DELCO REMY STYLE INBOARD ALTERNATOR OEM ARCO 20825
    21%
    $232.00 $291.92
    Late model 70 amp Delco Remy style alternator with 2 in. mounting foot and single V-Groove pulley fits various marine engines. New 70 amp 12...
    Alternator 70 Amp DELCO V-Belt Pulley PCM - Indmar OEM 57-5010 Alternator 70 Amp DELCO V-Belt Pulley PCM - Indmar OEM 57-5010
    24%
    $295.00 $389.95
    OEM Indmar Delco Style 70 Amp Alternator With a V-Belt Pulley Indmar and GM marine engine applications If you need alternator with serpentine belt pulley...
    ALTERNATOR 75 AMP UPGRADE INDMAR LT1 - LTR REPLACES 55 AMPS WITH 75 AMPS ALTERNATOR 75 AMP UPGRADE INDMAR LT1 - LTR REPLACES 55 AMPS WITH 75 AMPS
    13%
    $262.55 $301.19
    Mando 75 amp marine alternator with 2 in. mounting foot and 6 groove serpentine pulley Fits Mercruiser marine engines too. New 75 amp 12 volt...
    Alternator 95 Amp ARCO Marine Alternator PCM - Indmar 6 Groove Pulley OEM
    17%
    $286.90 $346.61
    New 95 amp 12 volt marine alternator with 6 groove pulley Fits 2007 Mastercraft X-Star + more! PULLEY INCLUDED! Internal regulator negative ground Alternator 95A...
    Alternator Kit 100 Amp Retro Fit 5.7L GM Engine RF097009B
    21%
    $389.95 $493.85
    100 Amp Alternator Retrofit Kit 5.7L GM For 5.7L GM Engines Retro fit kit, upgrade your 70 Amp GM alternator to the better 100 Amp Alternator...
    Alternator Kit 100 Amp Retro Fit 6.0L GM Engine RF097009C-6.0L
    14%
    $370.07 $427.88
    100 Amp Alternator Retrofit Kit 6.0L GM For 6.0L GM Engines THIS IS A SPECIAL ORDER ITEM. NON-RETURNABLE Retro fit kit, upgrade your 70 Amp GM...
    Alternator Kit 100 Amp Retro Fit PCM GT40 EFI And Carbureted Ford Engines OEM RF097009A
    17%
    $406.94 $489.06
    100 Amp Alternator Kit GT40 EFI & Carbureted Ford Engines Originally designed for the GT40 EFI engine Will work on Carbureted Ford engines Just use your...
    Alternator Mando 55 Amp Serpentine Grooved Pulley Indmar LT1 - LTR Replacement Alternator Mando 55 Amp Serpentine Grooved Pulley Indmar LT1 - LTR Replacement
    19%
    $241.66 $298.97
    Mando 55 amp marine alternator with 2 in. mounting foot and multi-groove serpentine pulley fits Mercruiser marine engines. New 55 amp 12 volt marine alternator...
    Alternator Mando Marine Inboard Alternator OEM ARCO 60065
    23%
    $224.84 $293.00
    Mando Inboard Marine Alternator New 65 amp 12 volt marine alternator Single groove pulley included Internal regulator 2-inch mounting foot Includes red battery sense and...
    Alternator Upgrade Kit 70 Amp V-Belt Style Original Indmar 495107
    4%
    $377.00 $394.44
    70 Amp Alternator Upgrade Kit - OEM INDMAR Alternator Upgrade Kit includes 70 amp Delco V-belt alternator with pulley, harness jumpers and all necessary hardware...
    ALTERNATOR UPGRADE KIT 90 AMP V-BELT STYLE PRESTOLITE ORIGINAL INDMAR 495105
    2%
    $595.00 $606.80
    90 Amp Alternator Upgrade Kit - OEM INDMAR For V-Belt Style Prestolite Alternator
    Bolt For Bottom Starter Mount OEM# PCM-R009167
    22%
    $7.70 $9.90
    Bolt used to mount GM new style P.M. starter - 3/8-16 X 4.33" You will need 2 of these
    Bolt For Bottom Starter Mount OEM# PCM-R009167-A - Special Shank
    49%
    $6.62 $12.95
    SPECIAL SHAFT - SEE PICTURE - Bolt used to mount GM new style P.M. starter - 3/8-16 X 4.33" You will need 2 of these
    Idler Pulley 8.1L Idler Pulley OEM R065040
    12%
    $19.91 $22.65
    Idler Pulley 8.1L Idler Pulley 8.1L Idler Pulley
    Idler Pulley LT1 Engines Replaces NLA Indmar Idler Pulley Idler Pulley LT1 Engines Replaces NLA Indmar Idler Pulley
    30%
    $73.05 $104.99
    Idler Pulley LT1 - Replaces the NLA Indmar Pulley
    Items 1 to 20 of 27 total