that sucks. It is an excellent reference and learning guide and it’s written at the high school level with good, clear explanations. It’s written by a mechanic, for mechanics, actually the author was a heavy equipment mechanic so he puts plenty of stuff relevant to our issues in. His tool (the loadpro leads) also works on 24V systems.
That's great, I find some times explanations are hard to understand for electrical if you're not super familiar with it, so it being easy to understand is huge. I have two electrical problems right now I could already use it for. Finally renting a shop next month so I need to make use of it by doing all of my repairs now.