IMPORTANT: If you are unsure about fitment or compatibility please use the "Contact Us" tab at the top of this page.
NOTE: All CMI Alternators are custom built and may require a short lead time.
Yes the 105A alternator costs about the same as the 90A alternator
because the stators, rotors and components cost us nearly the same. Some
builders would rather grossly mark up a 15A increase in output but we
This alternator fits most engines that require a 1" or 2" foot alternator. It does not fit Yanmar engines.
This is the only Leece-Neville / Motorola case alternator we know of that is available & already set up for external regulation. What sets this alternator apart from an off the shelf unit are the components chosen to upgrade, tweak it and make it ready for installation. High copper content brushes, high output diodes, fit-kit & a custom billet machined pulley set this unit apart.
CMI-105-ER includes a custom billet machined 3/8" belt pulley (not cheap
stamped steel), an upgraded high copper content brush assembly,
external regulation conversion, heavy duty rectifier, and a 1" to
2" spacer/bushing kit so it will fit either 1" or 2" mounts and accept
either a 3/8" or 10mm pivot bolt.
None of these items come standard with any "off the shelf" 8MR you'll find. These features are all added by Compass Marine Inc. so you have a ready to run unit. Even if you were to source the parts and build this alternator yourself you simply can't beat this price.
For the sake of it we ran the costs for a DIY build (6/28/18 pricing):
Leece-Neville 105A Marine Alternator - Best Price on-line $253.00 + shipping
5/8" ID X 3/8" Belt Billet Machined Pulley - Best Price on-line $36.99 + shipping
1" to 2" Fit Kit - Best Price on-line $26.29 + shipping
External Regulation Conversion Kit - Best Price on-line $43.95 + shipping
Total = $360.23 + Shipping (from multiple vendors) + Your Labor
Bottom line? The CMI-105-ER is a STEAL!!!!
We can package this alternator with either a Balmar MC-614H or ARS-5H 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.
is not a cheaply built re-badged automotive alternator with a dumb
internal regulator. This is a marine alternator spark protected with a
single 1" or 2" foot. The 1" to 2" spacer is included and is $26.00 in
additional components alone.. This 105A externally
regulated alternator is intended to replace the stock alternators found
on many Westerbeke / Universal diesel engines, Caterpillar or Cummins
engines and will replace most any Delco 10SI or 12SI frame alternator. It will fit any engine that uses an 8MR style alternator or Delco 10SI or 12SI.
This alternator 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.
The CMI-105-ER comes standard with tachometer output studs (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. The CMI-105-ER is set up for external regulation only. It has no internal regulator. You will need an external regulator to install this alternator.