Display Problems

There are several main conditions or sources of possible interference that may cause problems with the quality of the information displayed on the control head. Look in the following table for some symptoms of display problems and possible solutions:

Problem

Possible Cause

The control head loses

If the power output of your boat’s engine is unregulated, the

power at high speeds.

control head may be protecting itself using its over-voltage

 

protection feature. Make sure the input voltage does not

 

exceed 20 Volts.

Finding the Cause of Noise

Electrical noise usually affects the display with many black dots at high speeds, and high sensitivity readings. One or more of the following sources can cause noise or interference:

Possible Source of Noise

Isolation

Other electronic devices

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.

 

To determine whether the boat’s engine is the source of

The boat’s engine

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 cable away from the engine wiring.

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