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My boat has twin Cummins diesels - model 6CTA8.3-D(M)2 (mechanical not computer managed), fitted with 24V Delco 22Si alternators, one of which, at idle of 600 RPM, delivers highly fluctuating output –cycling from around 15-20 A at 27-28V to 23-24V and 60-70A. Each cycle lasts 5-6 seconds only...