Best to disconnect all the battery cables both positive and negative, clean them and reconnect them. Get yourself some Ultra Safety Systems TefGel ( https://www.jamestowndistributors.com/userportal/show_product.do?pid=546) and coat the connections with it. Clean both ends of the cables.
Like Fred said, measuring voltage is only part of the story. You're really looking for current. A corroded connection may show adequate voltage but may be incapable of passing enough current to start your engine. Dennis C. Touche' 35-1 #83 Mandeville, LA On Tue, Aug 13, 2019 at 1:34 PM Wade Glew via CnC-List < cnc-list@cnc-list.com> wrote: > thanks you. > > Ok, I'll get a volt meter to check the batteries directly. > if I'm to check all the grounds, I take this to mean: follow the > batteries back to wherever the system grounds to the engine block to begin > with. Then each of the battery terminals and finally to where the battery > banks come to the main ground bus? I'm really a rookie with electrical > stuff so be specific if you can. > > Wade > Oh Boy C&C 33 MK II > > On Tue, Aug 13, 2019 at 1:14 PM Frederick G Street via CnC-List < > cnc-list@cnc-list.com> wrote: > >> 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> 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 >>> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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