I haven't tested my '82 X1/9 yet, which of course has a Bosch alternator.
Not the "best" but seems to be better than my load tester so far. I bought one of these "TopDon" battery/charging testers on Amazon. The other plus, these Denso alternators are small and compact for their level of performance. They have been in the cars for years totally problem free. All of the vintage cars here have been converted to Denso 90A alternators, that have GOOD charge and system voltage regulation as these modern alternators are designed for electronics intensive modern cars. Vintage cars like the exxe are specially prone to problems with their alternators (yes, later 1500cc/5sp exxe have Bosch alternators and they can and are often a problem). IMO, this has been the cause of SO many battery problems (AGM batteries tend to be more charge-system voltage sensitive, get this wrong, they fail). If the charging voltage at the battery is less than 13.5 volts at idle or running, the battery will be unhappy and likely never be properly charged. Many times problems with batteries are rooted in problems with the alternator or charging system. Something to consider with any battery, what is the condition of the moto's alternator and charging circuit?
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