Unique Products for Your Boat
  • **SALE** AMP-IT 80-ER - 80A Yanmar/Hitachi Alternator - Externally Regulated

    $376.00 $336.00
    Please include engine make, model and belt width. Also please include battery bank Ah capacity and battery type eg: Flooded, AGM or GEL.


    We Do Not Ship Alternators Internationally

    Note:  AMP-IT Alternators (previously CMI branded) are hand built and may require a 1-2 week lead time.
    IMPORTANT: If you are unsure about fitment, or compatibility with LiFePO4 batteries, please use the "Contact Us" tab at the top of this page.

    The AMP-IT 80-ER: 

    This is the first and only Hitachi/Yanmar case alternator we know of that is built for external regulation. We started with the finest aftermarket parts we could source, based on many, many hours of hot run testing, & then we build these from the ground up as a better alternative to the stock Yanmar/Hitachi alternators or the Chinese knock-off units that don't last. You'll not find a better price on a Yanmar specific externally regulated entry level alternator.

    Note: This AMP-IT 80-ER can deliver over 100A under SAE testing criteria but we only rate this as an 80A unit. SAE testing is max output at room temp & 6000 alternator shaft RPM. Not a very realistic rating. The stator & rotor in this alternator have been optimized for a high percentage of the rated output a low RPM..

    External Regulator: 
    If you select the drop down menu you'll see that we can package this alternator with either a Balmar MC-614H or ARS-5H regulator. We recommend setting the Belt Manager feature to level three or four when setting up the regulator. It is also a requirement that an alternator temp sensor be used. We only recommend using Balmar or Wakespeed regulators with the AMP-IT 80-ER.

    AMP-IT 80-ER Specifications:

    This is not a cheaply built re-badged automotive alternator with a dumb internal regulator. This is an Yanmar fit, dual foot, externally regulated 80A alternator intended to replace the Yanmar / Hitachi LR180 series (now discontinued), and other Hitachi's, found on many small Yanmar marine engines.

    We worked with our component suppliers for many months to source the right parts, test them, and ensure the finished product could perform at the price point we desired especially getting low RPM performance where we wanted it. Some of the components we tested for this alternator failed in less than an hour when running at full output.

    This Hitachi cased alternator is hand assembled in the USA, in our own shop, and is built and tested to our own stringent specifications. With no dealers to support, this ensures a quality product at a fair direct to the customer, no middleman price. While  some of the components in the AMP-IT 80-ER are made overseas, we selected only the best performing components available.

    This AMP-IT 80-ER is a tremendous value and fills the gap between a true high performance alternator (see our other alternator offerings) and the factory alternator. It was designed to meet a price and performance niche not available to boaters previously. Get that healthier charging profile you've desired, at a fraction of the cost of our competitors. This alternator is not intended to drive massive AGM banks, massive flooded banks or massive GEL banks but it can if set up & temp protected correctly. If you have a large bank please see the other alternator offerings for heavy duty or extreme use.


    The AMP-IT 80-ER comes standard with a tachometer output wire (stator tap) for Yanmar diesels that run the tachometer sense off the alternator. Not all Yanmar engines drive the tachometer from the alternator, but some do. The AMP-IT 80-ER is set up for external regulation only. It has no internal regulator, although we can build them this way & the price is the same. The vertical plug of the "T" connection is the FIELD terminal to be driven by an external regulator.

    Special features:

    • Built to fit to Yanmar engines that use a 3.15" saddle mount alternator.
    • 80A rated, with good high idle performance.
    • Machine wound stator of 14GA top quality magnet wire means better cooling and higher temperature tolerance.
    • Precision machined rotor and slip rings for greater contact at all RPM.
    • Tighter tolerance of stator/rotor gap for better performance. The specs are better than the very expensive Hitachi branded alternators
    • Rotor is precision balanced to .035 ounce inches. Industry norm is .050 - .090. This means smoother operation and less harmonics.
    • Upgraded higher performance diodes.
    • Brushes are high copper content not run of the mill carbon brushes. This yields superior conductivity and considerably longer brush life.
    • Ready to accept an external regulator (Balmar & Wakespeed regulators are recommended).
    • 1/2" / 13mm Single V-Pulley   (3/8" / 10mm pulley is available upon request)
    • Billet machined pulley, not cheap stamped steel.
    • Isolated ground for steel or aluminum boats or for using a shunt in the negative path..
    • Hand assembled in the USA (Note: some internal components are non US made but carefully chosen)
    • WARNING: Not be used with LiFePO4 batteries unless current limited to 50% of output rating or installed with a Wakespeed WS500 set to not exceed 200F.