There is yet another possibility. I have been thinking of getting a nominal 12 volt vehicle system to stabilized 13.8 volt switching regulator. I have a compressor type 12 volt portable cooler that will not start unless the engine is running. This link is to the products I have been considering, but I have not pulled the trigger yet. Efficiency is around 90%
http://www.powerstream.com/dc2.htm Steve Thomas C&C27 MKIII Port Stanley, ON ---- Gary Russell via CnC-List <cnc-list@cnc-list.com> wrote: Loosening the alternator belt is a good idea, but don't do it for long as on most engines it also runs the coolant pumps. Gary ~~~~~~~_/)~~~~~~ On Fri, Sep 30, 2016 at 9:25 AM, Michael Brown via CnC-List < cnc-list@cnc-list.com> wrote: > Thinking out of the box here. > > The way the alternator is wired in and the state of charge of your battery > may be adding to the randomness of the problem. > If the output of the alternator is a heavy gauge short run directly to the > battery or the positive stud on the starter then the > battery will damping out a lot of the alternator's noise - voltage spikes > - variable output. > > That may not be the way your boat is wired. Another common wiring was to > use a smaller gauge wire ( 14 ? ) that runs back > to an instrument panel, through an ammeter, then forward again to a > terminal block ( or starter stud ). That is fine for the > intended purpose of charging the battery but not as good for damping out > alternator noise. The ammeter may have a wire > wound shunt that could act as a wonderful noise antenna. If the battery is > discharged then you will get a good current running > which might increase the energy in the wiring. If the battery is fully > charged from being on a shore power charger than it may > not be accepting much current and not dampening much. > > I have no idea how difficult this is but you could test by loosening the > alternator belt and starting the engine. Try it a couple of > times, then a couple of times with the belt tight. > > Michael Brown > Windburn > C&C 30-1 _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
