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available and 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.
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 load side of 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.
8) Second (Starting) Battery Voltage Sensing is an option on your
Link 1000
. As supplied
from the factory, the optional voltage sense circuit is Off. If you connect the positive
terminal (+) of your starting battery to Pin #6 of the meter (through a 2 Amp fuse!), you can
read the voltage of the starting battery. Remember if you choose to look at starting battery
voltage that it is only an indication of the battery's state of charge if the battery has been
at rest for at least 8 hours. This function is included as a convenience only. A battery with
an 8 hour at rest voltage of 12.4 Volts or more will likely start an engine. A battery reporting
11.1 Volts after 8 hours will likely not start your engine, particularly if you have dirty
injectors and the engine doesn't fire up right away!
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