Te taniwha

Thanks for all of the responses and information - I will apply this next week when i visit the boat at MK

Hopefully this reply will go to rusty69 and administrator - When measuring the starter battery volts, i disconnected all other wiring and put a 300ohm resistive load across it expecting to see a serious drop in volts..not so.and the battery isolator connections appear solid..... I have checked the connections for security but not the voltage measurements - Thanks for that - I would hope that with so little use any hardware would not fail - However !! The voltage reading on the control console indicated 12.2 after the glowplug heating light goes out. NOTE - the gauges in the console have some condensation inside - surely not a wiring problem? What is it that makes the clicking / claking noise when it first failed - sound like a relay contact.?? Can you recommend any web site for information on the correct wiring for the battery charging, connections to the alternator and starter motor - I have some info but dont fully comprehend. I am back at the marina next weekend and will try all recommendations thanks

My son purchased a wide beam boat prior to Covid to live on in a Marina.. It has never been used on the canals and has 6.3 hours engine usage. Approx 2 months ago - March - There was a problem with the Invertor, which after resetting came clear, and the leisure batteries appreared fully charged. Tried the engine which fired up and was left for 30 minutes to run. Late afternoon i decided to try the engine again - Nothing apart from a clicking noise.. Checked the 100aH battery with a charger and noted that the voltage was 14.4 volts and current drrawn 500mA steady. added my car battery and tried again - Engine tried to rotate but failed. Battery voltage during start process was about 12.2volts. Surely not the starter motor. Any suggestion please - The canals are calling If any information is missing my apologies - Complete newby