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Compass Marine How To | all galleries >> Welcome To >> Leece-Neville 8MR Series Alternator External Regulation Conversion > Done
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This 90 amp alternator is now ready to be installed and wired to an external three stage regulator. If installing this alternator and using it on a large flooded bank, AGM or GEL batteries you will want an alternator temp sensor.

Please be aware that Leece-Neville offers a number of different 8MR alternators that look the same but that are quite different. For example some have a 2" foot with no "universal adjustment ear" and some have a 1" foot with a large hole designed for a spacer or a 1" to 2" spacer/shim.

The real challenge is finding pulleys to fit these alternators & they do not come with pulleys or spacer/shims. Some are a 17mm shaft & some are a 5/8" keyed shaft. Both usually used cheap stamped steel pulleys not billet machined pulleys. Finding a billet machined pulley that can handle the loads better, than stamped steel, is quite difficult.

90A - 8MR2069TA = 17MM Shaft & 2" Foot with 10mm Bore

90A - 8MR2070TA = 5/8" Keyed Shaft & 1" Foot with 1/2" Bore

105A - 8MR2401UA = 5/8" Keyed Shaft & 1" Foot with 1/2" Bore

These are decent little alternators but they are not a true high output continuous duty alternator. They can be quite reliable but when pushed hard will not last as long a as a purpose built high performance alternator.

You can build one of these for about $385.00 or half the price of a true high output marine duty alternator.. Once converted in this fashion the alternator will be a "P Type" or positive field alternator and can be used with external regulators such as Ample Power, Balmar, Xantrex & Sterling. My personal preference for external regulation is, hands down, Balmar.

*WARNING* - These alts, when converted for external regulation, MUST use alternator temp sensing or preferably Amp Manager or Belt Manager if using Balmar regulators to keep them from over heating. These are good alternators but they are NOT a true high performance alternator and thus must have proper protection from overheating events.

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