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Old 02-23-2009
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Would it be possible to protect the shunt by switching in a short across the shunt (i.e. "path of least resistance"). E.g.

Normal usage, shunt inline:

Code:

                                       Gnd
                                        |
            |-------[Off]--/   /--------|
            |                           |
           (-)----- Shunt --------------|
House Bank (+)---------(+) FuseBox (-)--|
                                        |
                  [A]---(+) Engine (-)--|
                   |                    |
Starting Batt (+)--|                    |
              (-)-----------------------|
Emergency start, shunt shorted:

Code:
                                        Gnd
                                         |
             |-------[On]----------------|
             |                           |
            (-)----- Shunt --------------|
 House Bank (+)---------(+) FuseBox (-)--|
                    |                    |
                   [b]---(+) Engine (-)--|
                                         |
Starting Batt  (+)                       |
               (-)-----------------------|
So, normally, engine switch (A/B/Both/Off) is on A (starter battery) and shunt bypass switch is off.

For emergency start, engine switch is on B (house battery) and shunt bypass switch on, providing direct path to ground around shunt.

???
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