This covers 90A 24v Charging - Fault Finding
Part 4 v4.2.1 is a major 3-year revision of an article that has been evolving for 12 years.
For those who have read Part 4 v4.1 before the significant changes are on pages 5 ,6, 9, 10, 13, 20-25, 30-34, 51-68
https://www.dropbox.com/s/y7yr2jjujgxuldo/ALL%20CHARGED%20UP%204%20ver4-2.1.pdf?dl=0