Electronics International VA-1A User Manual

Page 12

Installation Instructions

Batt.

Master Switch

Contactor

Alternator

Starter Solenoid

VA-1A or External Shunt

This line may be connected currently to
the Master Switch Contactor or the
Starter Solenoid. In that case it should be
rerouted to the Bus or + side of the Shunt.

B
U
S

This is the main lead going to the Bus.
It may come from the Master Switch
Contactor or the Starter Solenoid.

To Starter

To Voltage Regulator

Figure 1:

Figure 1: VA-1A or External Shunt Installed in the Battery Lead

VA-1A or External Shunt Installed in the Battery Lead

Note: The VA-1A or External Shunt should not be installed in series with the starting current.

With the improvements made to the VA-1A there are few disadvantages using either method. Although EI’s
test pilot has a slight preference for the alternator lead when using the VA-1A, ease of installation should be
the determining factor. In most cases installing the VA-1A is a simple matter of replacing your existing unit
and adding a few wires (see Wiring Diagram).

Following is a typical diagram of each installation. Determine how the VA-1A or External Shunt will be
installed in your aircraft.

3. Determine how the VA Unit will be installed