IMPORTANT: All CMI Alternators are custom built and may require a short lead time. If you are unsure about fitment or compatibility please use the "Contact Us" tab at the top of this page.
Ample Power recently closed its doors leaving many of its alternator customers without a direct replacement option. We have had many requests for Ample Power replacement alternators so the CMI-HD125-ER has been introduced. It has also been heavily heavily upgradedin the process. The CMI-HD125-ER an exact replacement for the Ample Power small frame alternators, such as the 4023-S, and it's available in a Yanmar 3.15" saddle mount, 2" foot or 1" Motorola style foot mount (please specify mount type when ordering).
Never settling when it comes to performance Compass Marine Inc. has taken the Ample Power small frame platform to a whole new level of quality. Ample Power used 200V 50A diodes, we are using 400V 75A diodes. This means the alternator runs considerably cooler. We have also upgraded to using the finest USA made magnet wire available. It has a much higher temp tolerance rating than its predecessors. We also noticed localized heating for the B+ stud so we now build these with bronze B+ studs as it is significantly more conductive than steel. Once again, helps minimize excess heat developed in the alternator..
The CMI-HD125-ER is the best and most heavy duty small-frame alternator we build. Because we have no middle-man markup, and we sell direct to the end user, the CMI-HD125-ER saves you over $250.00 when compared to 120A Balmar 6-Series. The Balmar 6-Series is an excellent small frame alternator, but not all boaters have this in the budget.
Serpentine Pulley Kit Compatibility:
A major benefit to the CMI-HD125-ER is that it can be used with an AltMount/Balmar serpentine kit with minimal to almost no alignment issues during set up. See image above with a CMI-HD125-ER installed using an AltMount serpentine kit on a Yanmar 4JH3-HTE.
We can package this
alternator with a Balmar MC-614H or ARS-5H regulator or a Wakespeed WS500 or WS100 external regulator.. We strongly recommend
setting the Belt Manager feature to level three or four when setting up
the regulator. It's also mandatory that an alternator temp sensor be
used. Compass Marine Inc. will never make the lofty (bogus) claims Ample Power made about these alternators being constant duty. We choose not to grossly mislead our customers. No small frame alternator we know if is constant duty no matter how much a manufacturer tries to mislead you.
CMI-HD125-ER comes standard with tachometer output (stator tap) for
diesels that run the tachometer sense off the alternator. Not
all engines drive the tachometer from the alternator, but most
Westerbeke and Universal engines
do and many Yanmar engines do as well.