Malfunctions
Group 30: Electrical system
30
Manual fault tracing of bus cables
Special tools: Multimeter 9812519
IMPORTANT! Cut the current with the main
switch before the cables are disconnected.
It can be difficult to check whether there is a cable
fault in the bus cable when it is installed in the engine.
For this reason, always keep checked bus extension
cables in the fault-tracing equipment. Connect the ex-
tension cable to one end of the boat’s bus cable and
run it back to the other end of the bus cable, to allow
each conductor to be checked individually. After this,
all the pins can be checked.
1. Use multimeter 9812519 to check the bus cables.
The uninsulated parts of the conductors in the bus
cables should not be in contact.
Disconnect the bus cable at both ends and mea-
sure the resistance between all pins to check for
short circuit between conductors. The multimeter
should show infinite resistance between each pin.
If the resistance is less than infinite, there is a
fault.
2. Do a resistance check through each of the con-
ductors in the cable to detect if there is any open
circuit. Connect one probe to pin1 in one connec-
tor and connect the other probe to pin1 in the con-
nector in the other end of the cable (this does not
apply to the Y-split which has a different pin con-
figuration). The resistance should be approximate-
ly 0 ohm. Continue through all pins in the connec-
tor.
Check NMEA 2000 Gateway LED
There are two light emitting diodes on the interface.
One is lit when the NMEA bus has power supply. The
other has different lighting options.
Constant lit
The unit is powered up but receives no communica-
tion from any side.
Flashes on-off repeatedly
The unit is receiving and transmitting valid NMEA and
MULTILINK data. Function is correct.
Flashes two strobes and than off repeatedly
The unit is receiving MULTILINK data but has no
NMEA connection (doesn’t recieve velocity).
Flashes three strobes and than off repeatedly
The unit is receiving NMEA data but has no MULTI-
LINK connection.
NMEA 2000
https://www.boat-manuals.com/
