121
Electrical system
Glow plugs, checking power
supply/continuity
1
Connect a 12 V test lamp between the battery posi-
tive pole and ground to check that the lamp oper-
ates.
2
Connect the test lamp between the output of the
glow plug which is furthest away from the power
source and ground. When the control switch is en-
gaged, the test lamp should light if the power supply
is correct.
3
Disconnect the cables at the glow plug connections.
4
Connect the test lamp to the positive pole of the
battery and the connector of each glow plug The
lamp should light if the continuity is correct. If the
lamp does not light when checking one of the termi-
nals, the terminal must be replaced.
5
Connect the cables to the glow plug connectors
when all the glow plugs have been checked.
Glow plugs, function check
1
Disconnect the power supply cable and the cables
at the glow plug connectors.
2
Connect a 50-0-50 ammeter between the power
supply cable and the connector for one glow plug.
Connect a 0-20 voltmeter between the glow plug
connector and ground.
3
Connect the control switch and note the reading on
the ammeter and voltmeter.
In a 12 V system there should be an initial current
of 27 A which drops to 14 A after approximately 10
seconds. After that period the reading on the volt-
meter should be approximately 11-12 V.
If the reading on the ammeter is low or if there is no
reading at all, replace the glow plug. If there is no
reading on the voltmeter, check the switch and the
power cable.
4
When all the glow plugs have been checked, re-
move the ammeter and voltmeter and connect the
supply cable.
To Next Page