Relay Interface Board (Rib) - Kohler 8.5RES Service Manual

4.8 Relay Interface Board (RIB)

The standard relay interface board (RIB) contains the
K2 crank, K3 flash, and K5 run relays. Three LEDs
indicate relay operation. See Figure 4-14.
Refer to the schematic diagram in Section 7 for the
standard relay board connections.
The RIB is protected by a 10 amp fuse (F2) located in the
wiring harness. If the fuse blows repeatedly, disconnect
the board loads one at a time to identify the cause of the
blown fuse:
D
Lead 70A at the fuel valve
D
Lead IGN at the ignition module
D
Lead 71A at the starter relay
D
Leads FP and FN at the rotor
Repair or replace the component causing the blown
fuse.
If fuse continues to blow and disconnecting components
did not identify the cause, remove the leads from the
P14 connector using a pin pusher, part #241918 (large)
or 241919 (small). If replacing the leads does not solve
the problem, replace the RIB.
The individual relays are not replaceable. If one or more
relays are faulty, replace the entire RIB.
To replace the RIB:
1. Disconnect P14 and the brush leads FP and FN.
2. Pull the board straight off the mounting stand-offs.
3. Snap the new board onto the stand-offs and
reconnect P14 and the brush leads.
The generator set may be equipped with an optional
RIB, which contains the K4 auxiliary run relay and K1
common fault relay in addition to the standard relays.
The optional relay board kit includes a wiring harness for
34 Section 4 Controller
connection of customer equipment to the K1 and K4
relays. See Figure 4-15 for optional relay connections.
1
COMMON
K1
FAULT
2
K2
CRANK
3
3
9
VBAT
K3
FLASH
1. K1 common fault relay (optional)
2. K2 crank relay (standard)
3. K3 flash relay (standard)
4. K4 auxiliary run relay (optional)
5. K5 run relay (standard)
6. P14, engine harness connection (standard)
7. P13, connection to optional relay harness (optional)
Figure 4-14 Relay Board
Harness
Lead
Connector
Number
Pin Number
88 6
89 2
90 3
91 4
92 1
93 5
Figure 4-15 Optional Common Fault and Run Relay
Board Harness Connections
7
3 1
AUX
K4
RUN
6 4
P13
P14
K5
RUN
1
7
T1
FN
LED1
RUN
LED2
R
FLASH
R
LED3
FP
CRANK
T2
R
GM29779-A
6
Connection
Common fault normally open
Common fault common
Common fault normally closed
Run relay normally open
Run relay common
Run relay normally closed
TP-6196 5/04
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