I traded a diesel engine from a wrecked truck for this Big 40. The outside looks great, and it ran great. The seller overhauled it, putting a new front on it, so I don’t know what the serial number was. When they were refinishing to sell it, some parts got more attention than others, and they practically spray painted the entire guts, wiring, etc. I am trying to diagnose an issue because now because it won’t start. I plan to get a new battery. The alternator is new. I stick the key in and push the button, but I here a small click, and nothing; once it clicks once, it won’t click again. I welded with it the night he dropped it off, so I know it has worked, but the wiring looks rough. I want to get a book for it, and I have been trying to locate engine info. He said someone told him it was a 76. All I know is that that the engine has CWC F400A-612 on the bottom, and the top has F400A-531. Can anyone tell me anything about this welder? Does the starter sound bad? How can I find out what year it is, etc.? Many thanks for any assistance. There's also another number K156. I didn't take a picture of the top of the engine. I tried to upload pics of the welder, but it says they're too large. IMG_0496.jpg