It's the little things that become so very challenging. Replace the house batteries? I'm on it! There is no doubt it is going to be hard, so I adopt an "I can" mindset, creatively use available resources, bend my knees, and muscle up. Done!
No wonder this diesel engine was constantly overheating, half the water jackets were partially to fully closed with calcium built up over years. Lack of use results in water sitting idle in your diesel engine.