Circuit Board Gm28725/Gm64497 Terminal/Connector Identification - Kohler Decision-Maker 1 Manual

3.2 Circuit Board GM28725/GM64497 Terminal/Connector Identification

Controller Main Circuit Board
Terminal Strip TB1 (TB1A)
Terminal Wire Description
Emergency stop relay (K1) coil negative
1 1A
Emergency stop relay (K1) ground
2 1
3 42A Battery voltage (fuse #1 protected)
4 2 Ground
5 70C Generator set in cooldown mode signal
6 70R Generator set in running mode signal
Engine air damper indicator (if equipped)
7 56
Emergency stop indicator
8 48
32A Common fault line 2
9
10 26 Auxiliary indicator
11 12 Overcrank indicator
12 39 Overspeed indicator
Low oil pressure indicator
13 38
High engine temperature indicator
14 36
Controller Main Circuit Board
Terminal Strip TB3 (TB1B)
Terminal Wire Description
15 60 System ready indicator
16 80 Not in auto indicator
17 41 Prealarm low oil pressure indicator
18 62 Low battery volts (active low*)
Common fault/prealarm line 1
19 32
35A Low water temperature
20
21 40 Prealarm high coolant temperature indicator
22 63 Low fuel (active low*)
23 61 Battery charger fault (active low*)
* Check active low circuits for function by grounding designated
terminals.
Controller Main Circuit Board Terminal Strip TB2
Terminal Wire Description
Prime power operation (requires optional kit)
1 1P
Prime power operation (requires optional kit)
2 2P
Prime power operation (ground) (requires
3 3P
optional kit)
Prime power operation (requires optional kit)
4 4P
5 9 Crank mode (open-cyclic ground-continuous)
6 9A Crank mode (ground)
7 4 Remote start (active low*)
8 3 Remote start (ground)
* Check active low circuits for function by grounding designated
terminals.
TP-6356 4/12
Controller Main Circuit Board P1 Connector Pins
Pin Wire Description
1 71 Output to K2 relay (crank relay) (fuse #3 protected)
2 2 Ground for speed sensor
Output to safeguard breaker terminal and K5 relay
(if equipped with electronic governor)
3 70
(fuse #3 protected)
4 — Alternator flash
5 10N Starter motor ground (--)
6 S2 Speed sensor shield ground
Output to fuel solenoid (FS) on diesel models or
ignition system (I.S.) on gas/gasoline models
7 70
(fuse #3 protected)
8 24 Battery positive to speed sensor (fuse #2 protected)
9 16 Input from speed sensor
Input from low coolant level (LCL), positive
10 31A
temperature coefficient (PTC) sensor
11 — Not used
12 14P Input from battery positive
Input from auxiliary delay shutdown, high oil
13 31
temperature (HOT), if used
Input from auxiliary delay shutdown, low coolant
14 31
level (LCL), if used
15 31 Input from auxiliary delay shutdown, if used
Input from pre-high coolant temperature (preHCT)
16 40
switch
17 30 Input from auxiliary immediate shutdown, if used
18 56 Input from engine air damper switch, if equipped
19 57 Input from K6 air damper relay (ground), if equipped
20 — Not used
21 34 Input from high coolant temperature (HCT) switch
22 13 Input from low oil pressure (LOP) switch
23 41 Input from pre low oil pressure (preLOP) switch
24 35A Input from low coolant temperature (LCT) switch
Controller Main Circuit Board P2 Connector Pins
Pin Wire Description
1 70 Output to engine gauges (fuse #3 protected)
2 30A Overvoltage auxiliary
3 V7F Input from AC crank disconnect & instrumentation
4 — Not used
5 V0 Input from AC crank disconnect & instrumentation
6 2 Engine ground
Section 3 Decision-Makerr 3+ Troubleshooting 45