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Ask Sail: Voltage Drop

by Nigel Calder, Posted March 14, 2012
When I turned on my recently installed chartplotter, I got a “low voltage” message. Using a digital voltmeter, I measured 9.7 volts at the circuit breaker on the load side. Voltage on the battery side was 12.5 volts. 

Running Hot

by Nigel Calder, Posted August 24, 2011
Steph Lakner of Annapolis, Maryland, asks:"I have a Westerbeke engine (circa 1987) on a Cal 28. The engine overheats (to 210-215 F) after about 20 minutes running at full rpm. The impeller is fine, but water flow is reduced beyond the heat exchanger. I have found no obstructions (broken vanes, etc). I brought the heat exchanger home and cleaned it with vinegar. It was

Groundless Fears

by Nigel Calder, Posted July 22, 2011
Bill Schultz of Bay City, Michigan, asks:"I am installing a 24-volt battery bank in the bow of my 40-foot sailboat to power a bow thruster. Do I need to run a grounding wire to my engine block? Or can I use an alternative grounding site? What size wire do I need?"Nigel Calder replies:Technically, if the bow thruster has a case ground

Creative Heater Plumbing

by Nigel Calder, Posted June 22, 2011
Bill Reilly of San Francisco, California, asks:"To increase energy efficiency onboard I am wondering if I could plumb my water heater into my generator’s cooling system so that it shares the circuit from the main engine coolant loop that heats the hot water. It seems that a couple of sturdy Y-valves and brass one-way valves would adequately isolate these two systems, which

Fuel Cell Dreams

by Nigel Calder, Posted May 22, 2011
Pete Econ of Columbia, Maryland, asks:"How long before we see fuel cells replacing generators on sailboats? They make a lot of sense in that they are smaller, lighter and quieter than generators. I see one yacht manufacturer is already installing SFC methanol fuel cells, and I know the military is using fuel cells to replace and supplement batteries."Nigel

Rescue 21

by Gordon West, Posted May 9, 2011
First the good news. Throughout most of the continental United States, calling the Coast Guard on your marine VHF radio now ties you into one of the most modern marine radio networks in use anywhere on Earth. As of November 2010, the 26 Sector Command Centers in the Coast Guard’s Rescue 21 radio network can monitor transmissions along nearly 37,000 miles of coastline.On the East coast from

An Overzealous Alternator

by Nigel Calder, Posted April 14, 2011
Ed Douglass of Sturgeon Bay, Wisconsin, asks:"My Westerbeke/Universal M-35 diesel engine came equipped with a Mando 51-amp alternator. From its appearance, I would say it is an automotive-type alternator. It puts out a constant 14.6 volts, which not surprisingly causes my wet-cell batteries to boil. It does this even after I have charged the batteries to capacity with my

A Reluctant Engine

by Nigel Calder, Posted March 8, 2011
Ted Klastorin of Seattle, Washington, asks:"I have a Universal XP25 diesel engine with approximately 2,200 hours on it. The engine runs well, but is difficult to start after it sits idle for a few days. To get it started, I have to bleed air out of the fuel system for several minutes. Once started, however, it runs smoothly.I have checked and replaced both fuel

Fridge Burnout Mystery

by Nigel Calder, Posted January 25, 2011
Lewis K. Redmond of Plainfield, Illinois, asks:"We have an Adler/Barbour cold machine refrigerator, which is air-cooled with a small vertical evaporator. The ground wire and its retaining screw on the PCB board somehow were burned black. The technician’s guess was that something must have been thrown across the terminals to have caused this burnout. What measures would you

Mystery of the Alternator

by Nigel Calder, Posted January 25, 2011
Frank Hague of Jersey City, New Jersey, asks:"I repowered my boat last year with a new Westerbeke engine that came with a 100-amp alternator with an external regulator. I also have a solar array and an Air Breeze wind turbine feeding juice to my house batteries. When the house batteries are full and I am feeding them power from the alternator, my tach needle will suddenly
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