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 also a solution and may be ordered from us. 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 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.

WIRE BY WIRE INSTALLATION

Be sure the shunt is installed before proceeding.

The BLACK WIRE (AGND) is the Analog Ground. It is the reference for all measure- ments. It must be connected on the BSHG (Grounded) side of the shunt. The BSHG side of the shunt is the side opposite of the negative battery terminals. It must have a good connection to one of the two #10 screws on the top of the battery shunt.

The RED WIRE (+12 V) is the +12 V supply. (In a 24 V system supply with +24 V.) The wiring diagram shows two options. The preferred option is to jumper together the RED and BLUE wires as shown. Wired this way, the meter cannot accidentally be de-powered. It has the disadvantage of always consuming a little bit of power from the #1 Battery. The meter consumes about 28 mA (.028 A). If left on all the time it would use about 0.7 Ah per day.

If the system is left on for long periods (long enough to significantly discharge the battery) with no charging sources then you should consider the option shown with the dotted line. In this case the RED wire is not jumped to the BLUE but supplied from the common of the battery switch. (Be sure to install the 2 A fuse as near the battery switch as possible.) Whichever battery is selected is the battery that supplies the power. If the switch is turned off the meter is de-powered. To re-synchronize your meter you must fully charge the battery when it is put back into service.

The WHITE WIRE (LITE) supplies the display backlighting. It should be supplied from

aswitch that controls other instrument lighting. It may be connected to +12 V along with the RED wire if you wish the lighting to be on all the time. The backlighting consumes about 8 mA (.008 A). If left on all the time it would use less than 0.2 Ah per day.

The BLUE WIRE (B1V) supplies Battery #1 voltage for sensing. It should be supplied directly from Battery #1. Be sure to install the 2-amp fuse shown in the drawing as near the battery as possible.

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