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Woops -- not rectifier, I understand the symptoms indicate a failed regulator,

On reviewing my documentation of symptoms re, what I termed “alternator overcharging’, I was struck by me recording, many times that my 24.6V batteries were being charged at ~70 Amps at a votage below 24.6 - which of course is impossible. When I was taking the clamp meter readings I did not...

Hi ttmott, Thanks for those comments. The fluctuating AC possibly simply mirrors the fluctuating DC value. I'm thinking the closed circuit (short) between the sensor terminal (No.2) and the Batt connection is a certain indicator that the Alt is bad- despite being new. Is that (short ) also a...

Thanks to those who have offered me advice on how to solve - what appears an unusual problem of massive overcharging by an alternator on one engine in my twin engine boat. Briefly recapping: my boat has twin Cummins diesels - model 6CTA8.3-D(M)2 (mechanical - not computer managed), fitted with...

Further t

Thanks for posting. I also have that diagram. However it doesnt correspond to my engines. The local Cummins branch here in West Australia concede they have no diagram for my engines. Worse, they have my engine numbers listed as the computer managed model! I did further testing yesterday on...

Thanks fo reply. Planning to test the voltage of alt in AC mode tomorrow. Also if Alt warning light comes on when I turn ign key - & efore I start the engine.

Thanks for that suggestion. I'll do that end of week when next at boat. What about using diode function on a multimeter. Today I checked the original 24V Delco 22Si - with it uninstalled - sitting on bench - with the red probe on the casing and black on the Batt terminal and got a reading of...

Hi ttmott, thanks for your interest & replying. No I havent been game to do that yet. I recall you suggested that connection previously. However, after today's internet searching I see that arrangement on Delco 22Si is used by many people and your comment reinforces the merit of doing that. I'm...

I did post this item before, in early March 2024. I’ve done extra testing – details of which Ive included below -and so posting again. All discussion greatly appreciated. Thanks in advance. My boat has twin Cummins diesels - model 6CTA8.3-D(M)2 (mechanical - not computer managed), fitted with...

Thanks for your interest ttmott. My reply in bold. 1 - Not the "exciter" wire bur rather the actual grounding of the alternator case to the engine and batteries. (The Delco has a dedicated ground connection. I have used it and have installed a back up neg/ground cable to cater for poor...

Hi ttmott. Thanks for prompt reply. My response in bold It almost sounds like an intermittent grounding issue to the engine block and batteries. (I presume you’re concluding that from the fluctuating voltage difference between the exciter wire at the alternator connection and battery terminal –...

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...