Finding The Cause Of Noise - Humminbird MEGA 360 UNIVERSAL Installation Manual

Finding the Cause of Noise

Electrical noise usually affects the display with streaks or repetitive patterns on the
view. One or more of the following sources can cause noise or interference:
Possible Source of Noise
Other electronic devices
Other sonar devices
The boat's engine
Isolation
Turn off any nearby electronic devices to
see if the problem goes away, then turn
them on one at a time to see if the noise
re-appears.
Turn off any nearby sonar devices to see if
the problem goes away, then turn them on
one at a time to see if the noise re-appears.
To determine whether the boat's engine is
the source of the noise, increase the RPMs
while the boat is in neutral and stationary to
see if the noise increases proportionately;
if noise appears when you rev the engine,
the problem could be the spark plugs,
alternator, or tachometer wiring. Replace
the spark plugs with resistor plugs, install
an alternator filter, or route the control
head power and transducer cables away
from the engine wiring.
29 Troubleshooting