As well as my general electrical work – installations, fault finding, troubleshooting & repairs, I specialise in high output alternator upgrades and can significantly improve charging compared with the original factory fitted setup.

Many of these ‘upgrades’ I have developed myself with custom pulleys, shims and adjusting arms. I always use alternators I know peform well, quality tinned cable and heavy duty copper tube terminals. I carry a good selection of Gates Quadpower belts with me. Charging cable runs (positive and negative return through engine) are shortened and cable size increased to minimise voltage drop and improve performance and battery banks can be balanced.


Barrus Shire

The most popular upgrade I do is on the Barrus Shire engine. The factory fitted domestic alternator is a 80amp Japanese unit and it’s expensive, poor performing right across the engine rev range, and unreliable. The upgrade I fit involves using a reliable marine alternator with custom shims, custom high speed pulley, longer belt and various fittings and involves some rewiring. Charging characteristics and performance is totally transformed.


HMI Isuzu

High quality 120amp alternator and custom high speed pulley upgrade. Fits perfectly. Transforms alternator output at all engine speeds. Replaces the original 900021-ALS which is a re-badged 70 amp domestic alternator.


Vetus M4.X

The charging setup on some of this series of Vetus engine has been badly thought out: The original factory fitted alternators have low output right across the engine rpm range. Alternator spec according to Vetus ranges from 40-60 amp (optimistic figures), alternator pulley size is large, crank pulley small and output at tickover pathetic. The replacement cost of this poor performing alternator from Vetus is extortionate. The upgrade I do makes a massive difference.


Barrus 45 & 50

On the late Barrus shire engines they fitted a massive 240amp domestic alternator, Barrus part RDG2019682. Problem is that it was very badly thought out and the does not take advantage of the 240amp alternator. One problem is it’s just not possible for a 6pk pulley to transmit 12V 240A through a rigid alternator pulley. The 175amp upgrade I offer uses a freewheeling pulley. Belt squeal is stopped and alternator output is much improved at tickover and low engine revs. Engine also runs noticeably smoother as a result.


Often poor performance of the original Lister alternator is caused by low alternator speeds (sometimes because alternator is driven from the camshaft and 1/2 engine speed). Over the years I’ve worked on many charging upgrades for Lister engines and contact me to see ehats available for your engine.