Evinrude 4906B 4HP 1969 Owner's Manual page 198

Connect one end of a second black wire
to the fuel gauge terminal
the other end to a good ground.
important for the fuel gauge case to have a
good common ground with the tank unit.
Aboard an all-metal
is not necessary. However, if the dashboard
is insulated, or made of wood or plastic,
wire MUST be run from the gauge ground
terminal to one of the bolts securing
sending unit in the fuel tank, and then from
there to the NEGATIVE side of the battery.
FUEL GAUGE TROUBLESHOOTING
In order for the fuel gauge to operate
properly the sending unit and the receiving
unit must be of the same type and prefer-
ably of the same make.
The following symptoms
corrective actions will be helpful in restor-
ing a faulty fuel gauge circuit
operation.
If you suspect the gauge is not operating
properly, the first
electrical connections
other. Be sure they are clean and tight.
Next, check the common
between the negative
the fuel tank, and the gauge on the dash.
If all wires and connections
are in good condition,
unit from the tank.
gauge mounting flange on the tank to the
flange of the sending unit.
float up-and-down to determine
ceiving unit operates.
does not appear to operate,
to the midway point of its travel and see if
the receiving unit indicates half full.
If the pointer does not move from the
EMPTY position one of four faults could be
to blame:
1- The dash receiving un: ~ is not proper-
ly grounded.
2- No voltage at the dash receiving unit.
3- Negative meter connections
posi tive grounded system.
4- Positive meter
negative grounded system.
If the pointer fails to move from the
FULL position, the problem could be one of
three faul ts.
1- The tank sending unit is not properly
grounded.
2- Improper connection
tank sending unit and the receiving
marked GRD and
It is
boat, this ground wire
the
and possible
to proper
area to check is all
from one end to the
ground wire
side of the battery,
in the circui t
remove the sending
Run a wire from the
Now, move the
if the re-
If the sending unit
move the float
are on a
connections are on a
-
between the
unit on
the dash.
3- The wire from the gauge to the igni-
tion switch is connected
inal.
If the pointer
mark, it indicates a six-volt gauge is install-
ed in a 12-vol t system.
If the pointer remains at about 3/8 full,
a
it indicates a 12-volt gauge is installed
six-volt system.
Preliminary Inspection
Inspect all of the Wiring in the circuit
for possible
conductor. Carefully check:
1- Ground connections
unit on the dash.
2- Harness connector to the dash unit.
3- Body harness connector
harness.
4- Ground connection
to the tank floor pan.
5- Feed
sending unit.
GAUGE ALWAYS
ignition switch is ON:
1- Check the electrical
the receiving
harness connector
nector; and the tank unit connector
tank.
2- Make
ground wire from the tank to the tank floor
pan.
3- Connect
the tank feed wire and the ground
Raise and lower the float and observe the
receiving unit on the dash.
follows the arm movement,
sending unit.
GAUGE ALWAYS
the ignition switch is ON:
Disconnect
do not allow the wire terminal
The gauge on the dash should read FULL.
If Gauge Reads Empty:
1- Connect a spare dash unit into the
dash unit harness connector
unit. If the spare unit reads
or iginal unit is shorted and must be replac-
ed.
2- A reading
short in the harness between the tank send-
ing unit and the gauge on the dash.
FUEL SYSTEM
at the wrong term-
remains at the 3/4 full
damage to the insulation
at the receiving
to the chassis
from the fuel tank
wire connection at the
READS FULL when the
connections
unit on the dash; the body
to chassis harness
a continuity check
a known good tank unit to
If the dash unit
replace the tank
READS EMPTY
the tank unit feed wire and
to ground.
and ground the
of EMPTY
6-9
in a
or
tank
at
con-
in the
of the
lead.
when
FULL, the
indicate a