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we strongly recommend them. With isolated negative output alternators, remember that
instrumentation and other loads grounded directly to the engine block will not be
measured unless their negatives are relocated to the load side of the Battery Shunt.
Special high current shunts are really the right solution and may be ordered from
Heart Interface. A separate engine starting battery whose negative is connected directly
to the engine also solves the problem. The Heart Interface heavy duty shunt is Part Number
84-2013-00.
6) We have shown several wires connected to the load side of the battery shunt in the
wiring diagram. If more than a few wires must be connected here, it is best to use a 2/0
jumper from the shunt to a good negative bus. We recommend that no more than two,
or at a maximum three, connections per large bolt be made on the negative bus side of the
shunt. The negative bus should be a solid copper or brass bar with many threaded screws
under which the negatives for all of the loads may be secured. It should be fed with a
conductor of sufficient size so that there is no appreciable voltage drop even under full load.
7) We are frequently asked about battery isolators. We don't recommend them. The reason
is that battery isolators have a noticeable voltage drop across them which may be greater
than 0.5V. In most instances, a better solution is to use a battery combiner which keeps a
starting battery charged without a voltage drop.
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