When I tried to start the 240 a few weeks ago, it cranked but wouldn’t start and it sounded like the battery was low. I put a charger on it for a day and the battery only got up to 12.3 volts. It was 10-years old so I bought a replacement along with new cables. I removed the old battery. I removed the air mass meter and hoses to get better access and removed the negative cable from the body and frame and the positive from the starter. Also disconnected is the positive wire from the battery to the terminal box. I don’t think I disconnected anything else.

Armed with a new batter and cables, I hooked the negative to the body and frame. I connected the positive to the starter. I left everything else disconnected. I hooked the positive to the battery and when I briefly touched the negative to the battery I heard a click, like a starter solenoid. I tried again and held it to that battery a moment longer and the engine cranked.

What the heck?