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Reelmaster 3550−D Page 5 − 39 Electrical System
Glow Relay
The glow relay is secured to the control panel assembly
next to the operator seat (Fig. 42). This relay is attached
to the wire harness with a four (4) wire connector
(Fig. 43). The relay can be accessed by removing the
control panel cover.
The glow relay is used to provide current to the engine
glow plugs. The TEC controller energizes and monitors
the operation of the glow relay when specific input condi-
tions are met. The glow relay should remain energized
for six (6) seconds after the ignition switch is set to the
RUN position. The glow relay should also remain ener-
gized as long as the ignition switch is in the START posi-
tion.
1. Lock nut
2. Start relay
3. Main power relay
4. Glow relay
5. Screw
6. Mounting bracket
Figure 42
2
3
4
1
5
6
Testing
1. Park machine on a level surface, lower cutting units,
stop engine, engage parking brake and remove key
from the ignition switch.
2. Test the glow relay circuit as a TEC electrical output
using the Diagnostic Display (see Diagnostic Display in
this chapter). If output testing verifies that the TEC is en-
ergizing the glow relay circuit under the appropriate con-
ditions, use the following procedure to test the circuit
wiring between the TEC and the glow relay.
Figure 43
86 87
85 30
85 86
87
30
3. Test the circuit wiring:
A. Remove cover from control panel and locate re-
lay that is to be tested.
B. Disconnect wire harness connector from the re-
lay.
C. Position the necessary input(s) to illuminate the
GLOW output LED indicating that the TEC controller
is energizing that function (see Table 3: Input Condi-
tions Required to Illuminate Diagnostic Display Out-
puts in this chapter).
D. Connect multimeter (DC voltage setting) across
the terminals of the wire harness connector. 12VDC
should be present at the connector when the GLOW
LED is illuminated.
E. Repair damaged wiring as necessary.
4. If the circuit wiring is functioning correctly, use the fol-
lowing procedure to test the relay.
A. To make sure that machine operation does not
occur unexpectedly, disconnect negative (−) cable
from battery and then disconnect positive (+) cable
from battery (see Battery Service in the Service and
Repairs section of this chapter).
B. Remove cover from control panel and locate
relay to be tested.
C. Disconnect wire harness connector from relay.
Remove relay from mounting bracket for testing.
Electrical
System