Distributor Interference; Battery Connections - Vertex Standard VXD series Installation Manual

Chapter 2 Reducing Noise Interference
Step 3.
Connect wire lead to capacitor
using lockwasher and nut.
Step 1.
Mount Capacitor
(0.1µF Coaxial Type)
to vehicle chassis
using lockwasher
and self-tapping screw.
Step 2.
Disconnect wire (dashed)
from battery post and
connect to capacitor using
lockwasher and nut.

2.4.2.4 Distributor Interference

This type of interference is characterized by popping sounds which are present at all engine speeds.
It is caused by sparking between the rotor and the distributor cap inserts as the rotor turns. To sup-
press this noise, use resistance ignition wire to connect the ignition coil to the distributor cap.

2.4.2.5 Battery Connections

The radio set power cable can pick up noise generated in the vehicle. This can be minimized by con-
necting the power cable directly to the battery instead of the fuse block. The battery acts like a large
capacitor (about one Farad for a 50 Amp/hour battery), which bypasses induced noise. The battery
ground lead should be securely bonded to the vehicle frame. Undesirable parallel ground currents can
be minimized by using the vehicle frame as a common ground point. If ignition switch control of the
radio is desired, the radio power leads may be connected to the battery through a relay which is con-
trolled by the ignition switch.
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Step 4.
Connect capacitor
lead to battery post.
Figure 2-3 Ignition Coil Nose Suppression
From distributor
Distributor Post
Battery Post