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Compass Marine How To | all galleries >> Compass Marine How To Articles >> Universal Diesel M-25 Alternator Upgrade > Leece-Neville External Regulator Adaptor Plate
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Leece-Neville External Regulator Adaptor Plate
08-MAR-1998

Leece-Neville External Regulator Adaptor Plate

When I got ready to buy I called Leece-Neville and found the name of a local dealer here in Maine. The next day I visited Ron’s Auto Electric and was impressed with Ron’s knowledge.


When I arrived at Ron’s shop I had my old Motorola alternator in hand. After a brief discussion he said “Yuh’ I got just whut ya neehd” and took me upstairs where the shelves were thick with electrical parts and pieces like only a true Maine woods shop could be.


At this point I was convinced this guy could fix anything electric and never need to order parts. Hell, he already had enough parts on hand to re-wire the Pentagon. Deep in my heart however I knew he would not have the external regulation plate I wanted for my set up.


In a very abrupt and direct Maine way he walked over to a wooden shelf, reached out his calloused burly hand and grabbed a 90 Amp 12 volt marine alternator the Leece-Neville 8MR2069TA. This is the identical case as the original Motorola as Leece-Neville/Prestolite bought the rights to the Motorola alternators. It had the regulator already mounted to the back, from the factory, and Ron told me this is the way they ship them no if's, and's or but's. "Ya cahn't buy em any otha way"..


I then asked if he had the plate for external regulation conversion and before I even got the sentence out of my mouth he was holding the external regulation plate in his hand. Yee haa!


He told me that he could install the plate, and my old pulley, and I could pick it up in about an hour. Doing the conversion is actually very easy to do but I took him up on it as it saved me some time.


I then double checked to make sure this alt had the same number of poles for feeding my tachometer. On an a diesel the tachometer is sensed off AC current side of the alternator before the diodes hence the term "AC Tap". He just looked me square in the eye and said "this units got the same darn numbah ah poles as the one in ya hahnd." That was his way of saying this is plug and play....

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Chuck Bullett 16-Jul-2012 13:48
Great story- I grew up in Maine and totally relate. In San Francisco now replacing the 55A Motorola on my Westerbeke W30. While I just settled and bought another Motorola on ePay, this info will definitely be my upgrade path.