Originally Posted by tkeithlu
Hey, Boatbod - Thanks for the update on load testing. I'm a victim of learning
my mechanics in the 1960s, and didn't know electronics
had entered that area. What scares me is diesels becoming electronic - leaving the possibility of a blackbox failure that no at-sea mechanic
can repair. Fortunately for me, I run an old Navy
4-53 main and a Universal M-25 genset.
EPA emissions rules have essentially driven the adoption of fully electronic common rail diesel
engines. They started big (200~400HP) and are getting smaller all the time. These days the largest of the Yanmar
4cyl (4JH) series are there, and it's only their smaller engines under 100HP that have yet to be affected.
By the way, the conductance battery
testers are still a little pricey for an individual to own for personal use, but they are essential equipment
and battery dealers. That said, you can still learn just about all you ever need to know about the condition of a battery by hooking up a digital volt meter to check the "resting voltage" and then watching how quickly the voltage rises as you apply charging current
Any battery that rests at less than "full" (12.7-12.8v) and is subject to a charging current
should either take appreciable current or appreciable time to rise to absorption voltage. If the voltage rise is very quick and/or the charge current very low it indicates a badly sulfated battery that should be replaced. Similarly, any battery that continues to accept significant charge current but never reaches the absorption threshold (or gets very hot when charged) is suspect for a bad cell.