Hi all, we’ve recently installed 4 new leisure batteries on our narrow boat. All connections are fine and all batteries, including starter battery, are reading over 12v with a multimeter, as well as on our panel in the boat. After putting isolators back on engine started fine. We let it run for 10 mins then turned it off. When we went to start her again, the engine turned over and sounded like it was trying to start but then gave up. The battery light circled in the picture attached stayed on. Diesel level is fine and we haven’t touched anything else. Any ideas greatly appreciated ?