Usually, there is a shop that specializes in alternator and starter repairs for cars somewhere nearby. Google that for the best price.
Chuck Resolute 1990 C&C 34R Broad Creek, Magothy River, Md > On November 1, 2016 at 2:26 PM David Knecht via CnC-List > <cnc-list@cnc-list.com> wrote: > > I took the alternator out of the boat last weekend so I could get it > tested. Any suggestions on where to take it? Would a good auto repair shop > be able to do this, or do I need someone more specialized. Dave > > Aries > 1990 C&C 34+ > New London, CT > > > > > > On Oct 3, 2016, at 12:07 PM, Jerome Tauber via CnC-List > <cnc-list@cnc-list.com mailto:cnc-list@cnc-list.com > wrote: > > > > If it's rf noise generated by the alternator it may be coming in > > through your GPS antenna as well as data or power lines. If it is rf noise > > you should be able to hear it with a small AM radio held nearby (tune to > > around 1400 KHz). I still think your voltage regulator is suspect. When > > the battery reaches its maximum charge of approximately 14.2 volts, the > > regulator will then limit the alternator's output. The battery acts as a > > buffer so that may be what's causing the problem to sometimes not show with > > the engine on.. If the engine has been off for a while the battery > > voltage may fall in the 12's and it may take a while for it to overcharge > > into the 14's where your chart plotter may start to act erratically again. > > When you turn off the engine it may take a few minutes for the voltage to > > drop back into a safe level. You said you are measuring in the 14 volt > > range with the engine on. If it is above 14.2 that would be suspect. Jerry > > J7J > > > > > > -----Original Message----- > > From: Della Barba, Joe via CnC-List <cnc-list@cnc-list.com > > mailto:cnc-list@cnc-list.com > > > To: 'cnc-list@cnc-list.com' <cnc-list@cnc-list.com> > > Cc: Della Barba, Joe <joe.della.ba...@ssa.gov> > > Sent: Mon, Oct 3, 2016 11:08 am > > Subject: Re: Stus-List Chart plotter problem > > > > You could try something like this: > > > > http://www.ebay.com/itm/NEWMAR-PC-25-Noise-Filter-Power-Conditioner-25-amps-/231859240381?hash=item35fbe33dbd:g:Zn0AAOSwPc9W0ftz&vxp=mtr > > > > Oscilloscope (scope) https://en.wikipedia.org/wiki/Oscilloscope FYI > > If you know any ham radio operators, they probably know where to > > find one to borrow. > > > > Your plotter also could just be nuts ;) > > Joe > > Coquina > > > > > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of > > David Knecht via CnC-List > > Sent: Monday, October 03, 2016 09:56 > > To: CnC CnC discussion list > > Cc: David Knecht > > Subject: Re: Stus-List Chart plotter problem > > > > Hi Joe and thanks for your input. Some answers below. > > > > Aries > > 1990 C&C 34+ > > New London, CT > > > > <image001.png> > > > > > > On Oct 3, 2016, at 9:11 AM, Della Barba, Joe via CnC-List > > <cnc-list@cnc-list.com> wrote: > > > > Some things to try: > > 1. Run the plotter off its own battery. Little 6 ah AGM > > batteries are cheap enough if you don’t have a spare battery sitting around. > > Given the intermittent nature of the problem, this would be > > challenging to do long enough to be definitive. I am also not sure it will > > identify the source of the problem since it appears to be the power (see > > below). > > > > 2. Put a scope on the DC bus to see what, if any, AC/noise is > > on the line. Include an engine start with this. > > I don’t have a scope and have not used one. What kind of device > > would you do this with? > > > > 3. Disconnect the NMEA interconnection and see what happens. > > As I said, when this happened last week, the NMEA input was > > disconnected from the chart plotter, so this seems to be coming from the > > power connection. What is frustrating is that yesterday, I started the > > engine twice, once before and once after the race, and the chart plotter > > behaved perfectly and never beeped once. Nothing was obviously > > different?????? > > > > > > > > 4. Check the NMEA connection for configuration. Does the > > plotter send and receive data or just send? No need to have the NMEA input > > line connected if there is no data headed that way. > > 5. Put a laptop on the NMEA connection or run the diagnostic > > window on the plotter, if it has one, and read the raw NMEA stream to see > > if it is getting some odd data or any data at all if it should not be. > > 6. Put ferrites on all incoming wiring. > > 7. Check for ground loops and NMEA isolation* > > * > > This one is a bit tricky. First off, make sure the power supply and > > ground connections are at exactly the same place as your other electronics. > > Ground loops are bit complicated to explain and hard to find, but the short > > version is this step will eliminate some of them. Second is check with the > > manufacturer to see if your plotter NMEA connections are true marine > > standard opto-isolated. It is very possible to use direct wiring to NMEA > > data and not isolate it, my laptop/plotter does just that, but optical > > isolation prevents various stray voltage and ground issues from messing up > > the data. Equipment is fairly resilient now, but back in the day an engine > > start could generate noise that would totally screw up electronics. Even > > now I will start an airplane with all radios and nav equipment off and then > > turn it on. I once was delivering an airplane that had a screwy alternator > > I had to switch off to use the radios and nav gear and then switch back on > > when the battery got low. > > BTW – my boat is wired so the engine start battery is usually > > separate at engine start and has no effect at all on the electronics. They > > don’t combine until charging voltage is present for a few minutes. Is yours > > like that? > > Joe > > Coquina > > C&C 35 MK I > > > > > > _______________________________________________ > > > > 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! > > _______________________________________________ > > > > 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! > > > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! >
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