Agreed, sounds like a bad ground. Voltage is one thing; but enough current to crank is another, and definitely something that will be adversely affected by bad ground continuity.
— Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > On Aug 13, 2019, at 12:39 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > Clean all the ground connections. > > Dennis C. > > On Tue, Aug 13, 2019 at 12:26 PM Wade Glew via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > Hello listers, I would appreciate any advice you might have on my electrical > issue du jour. > > Mine is a C&C 33 MK II and I have a Link 20 battery monitoring system. Bank > 1 (house) is 4 Trojan T-105 (225 AH) 6V deep cycles about 5 years old. Bank > 2 is a 12V starter battery dated 2005. I look after my batteries pretty well > and the system seemed to be operating normally. I have a True Charge 40 > battery charger. One morning after several days out sailing, drinking lots > of cold beer from the fridge and lots of music playing) and running the > engine very little, the engine would not start. Starter turned slow, felt > like no battery power. I had the Master Switch on 1 so I turned the switch > to Battery 2 at which point all 12V electrical activity on the boat stopped > working altogether. Prior to switching to Bat 2, the Link 20 showed my > starter battery at 12.4V with estimated time on battery remaining at 225 > hours. I put a portable battery pack onto my starter battery and it read > 12.4 V from the battery. However, powering up the battery pack and > connecting to my starter battery allowed me to start the engine. > > I went back to harbour and replaced my starter battery with a brand new 1000 > cranking amps 12V battery. I charged by shore power overnight then left for > a few more days on the water. > > Now, the current circumstance is this. > When connected to shore power and Main Switch set to Bat 1, I see normal > charging voltages to both battery banks. > When under engine and Main Switch set to ALL, I see normal charging to both > batteries. > After sitting overnight on anchor, I see both Bank 1 and Bank 2 are resting > at about 12.5 V. Both banks show plenty of reserve on the Link 20. When I > try to start the engine it feels again like I have low battery power. The > engine barely turns when I set the Main Switch to either Bat 1 or ALL and > won't start. If I change the switch to Bat 2, all 12V electrical activity on > the boat instantly stops. If I put the portable battery pack onto my starter > battery with the switch in the ALL position, the engine will go however, it > still feels like the starter is turning too slowly. > > I'm looking for a single cause to explain all this as up til now, the system > has functioned well for the 10 years I've owned the boat. I would appreciate > any suggestions > > Wade > Oh Boy, C&C 33 MK II
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