Fresh paint can easily mask underlying metal fatigue, severe body corrosion, or cracked cast-iron housings on a second hand tractor. Look beneath the fenders, along structural chassis rails, and around battery trays for deep rust. Be wary of freshly painted engine blocks, which sometimes disguise weeping oil gaskets or patched casting cracks. https://blogfolders.in.net/article/converting-an-old-tractor-to-a-12-volt-electrical-system-guide