2.0 Wiring
RED Battery +12V
BLACK Ground
GREEN Ignition (top-light power source)
BROWN Roof-light (top-light power output)
WHITE Vehicle Motion
2.1 Grounding
We recommend that you ground the CG3 taximeter at the automotive battery, in order
to:
properly detect the vehicle motion signal, and
to aid in ensuring that vehicle noise is not induced into the taximeter
motion circuit (from nearby circuits, motors, etc.).
This can’t be over emphasized. In our experience, 90% of problems having to do
with detecting motion signals and/or noise are directly attributable to where
the taximeter is grounded. Grounding the taximeter to the frame, body or some
other intermediary point raises the potential for two main difficulties:
1) By introducing a small, but significant circuit resistance at the motion
detection circuit within the taximeter. This interferes with the capability of
the taximeter to detect a signal that is often already low in voltage
strength.
2) By creating ground loop problems, which are essentially circuits of
electromagnetic signals (noise). By grounding the taximeter to an
intermediary point, you risk having the taximeter act as a path to ground
for this noise.
On the other hand, Grounding at the battery helps to isolate the taximeter from noise,
by ensuring that it is not sharing a ground with other circuits. By grounding the
We have even encountered occasions where this small resistance produces voltage, which in turn generates current, which can then
flow back into the vehicle speed sensor, causing all sorts of problems such as improper automobile transmission shifting.
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