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Old 02-23-2009
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You could wire a single pole, double throw (SPDT or A/B) switch in the circuit, and use that to take the shunt off line when you need to start using the house bank. The common terminal of the switch would go to the batteries, and one pole would go to the shunt and the other to the shunt bypass.

Quote:

Setup with both switches in A for normal use:

.............................................Gnd
..............................................|
............|-------------[shunt bypass]------|
............. ................................|
...........(a)------------- Shunt ------------|
............|................................ |
House Bank (+)---------(+) FuseBox (-)--------|
..............................................|
...............--------{a]---(+) Engine (-)---|
...............|..............................|
Starting Batt (+)
........................... |
..............(-)-----------------------------|


Setup with both switches in B for bypass use:
.............................................Gnd
..............................................|
............|-------------[shunt bypass]------|
............| ................................|
...........(b)......------- Shunt ------------|
............|................................ |
House Bank (+)---------(+) FuseBox (-)--------|
........................|.....................|
.......................{b]---(+) Engine (-)---|
..............................................|
Starting Batt (+)
........................... |
..............(-)-----------------------------|


If you had a single, heavy duty double pole double throw switch, it could do it automatically, and prevent any risk of frying the shunt by accident.
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Last edited by sailingdog; 02-23-2009 at 09:49 AM.
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