Onan MDKBH Series, Service Manual

Page: 68 / 90

9-7
HIGH EXHAUST TEMPERATURE
SWITCH (S5)
WARNING
Accidental or remote starting can
cause severe personal injury or death. Before
removing a panel or access door, disconnect
the negative (–) cable at the battery to prevent
the engine from starting.
The high exhaust temperature switch is bolted to the
ear on the side of the water/exhaust mixer (Fig-
ure 9-5). The switch is accessible by removing the
enclosure back panel.
RAW WATER FLOW SWITCH (S6)
The raw water flow switch is threaded into the heat
exchanger (Figure 9-5) and is accessible through
the top access opening. Use thread sealant and en-
gage at least two full threads when installing.
Check continuity across the switch terminals while
blowing into it (1 psi). Replace the switch if it does
not open and close.
GLOW PLUG RELAY (K3)
The glow plug relay is mounted on its wiring socket
on the controller mounting bracket (Figure 9-1). Pull
the relay out to test it. Apply 12 VDC across termi-
nals 85–86. Replace the relay if the contacts across
terminals 30–87 (NO) do not open and close.
STARTER RELAY (K4)
The starter relay is mounted on its wiring socket on
the controller mounting bracket (Figure 9-1). Pull
the relay out to test it. Apply battery voltage across
terminals 85–86. Replace the relay if the contacts
across terminals 30–87 (NO) do not open and close.
GOVERNOR ACTUATOR (A12)
See Page 6-7.
GROUND ISOLATION RELAY (K9)
See Page 6-11.
RAW WATER
FLOW
SWITCH S6
HIGH EXHAUST
TEMPERATURE
SWITCH S5
FIGURE 9-5. HIGH EXHAUST TEMPERATURE AND
RAW WATER FLOW SWITCHES
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