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MAN 650066:D
29
Symptom Possible Problem Solution
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The fuel display reads The control box may be set for Refer to “Fuel Setup”
backwards, incorrectly, the wrong type of fuel sender. section of the installation manual
or does not change. to ensure that the settings match
your fuel sender.
The fuel sender may not be Check the connections at both
connected to the control box ends of the fuel sender wire.
properly. Make sure the fuel sender is
grounded properly.
The fuel sender may not be Check the fuel sending unit with
operating properly. an electrical multi-meter.
The fuel sender may have a Use the custom fuel sender setup.
non-standard resistance See the Fuel Setup section of the
range. manual for instructions.
The oil or water display The engine block may not be Use heavy ground cables from the
reading is incorrect. grounded to the chassis frame battery to the engine block.
or body properly. Make sure both ends of the cable
have clean metal-to-metal
connections.
Use a braided ground strap to
ground the engine block to the
chassis.
Use a large braided ground strap
to ground the engine block to
the body or fire wall.
The sending units are not grounded Make sure wires are in correct terminals.
the control box.
The sending unit wire is picking Isolate the sending unit wire from
up noise from nearby wires. motor and ignition wires.
The sending unit is not Use the sending unit provided with
compatible with the control box the display system.
The gear shift indicator The optional gear shift sending Connect the sending unit to the
does not light up. unit is not connected to the control box using the
control box. instructions supplied with the
sending unit.
The gear shift indicator The gear shift decoder Check the connections to the
does not operate is not connected properly. transmission linkage and to
properly. the control box.
Check gear shift decoder
Installation manual.
The internal turn signal The control box is not connected Check the wires connected to the
and high beam to the vehicle's electrical HIGH, LEFT, and RIGHT
indicators do not light up. system properly. terminals on the control box.
The check engine The control box is not connected This feature is designed to work
indicator does not to a TPI control module. with engine control systems that
operate properly. provide an active low signal.