ENGINE AR-COMPLETE 3645476 - Caterpillar

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Generic Legacy Harness Wiring Connections See footnotes of Table 1 for more information.
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Generic Wiring Example for an Input that Goes High When Engine is RunningLegacy Harness For Caterpillar Machines
Table 2
Legacy Harness Connections    
P1 Connector
Pin Number    Harness Wire    Description    Connection Point for the Machine    
1     125-OR     Unswitched Power     Fused (5 amp) unswitched power circuit (1)    
2     200-BK     Ground     Machine ground    
3     308-YL     Keyswitch On     Circuit that provides battery voltage only when the keyswitch is turned to the ON position    
4     403-GN     R-term     Alternator R-term circuit (2)    
5     944-OR     CAT Data link +     CAT Data link communications "+" circuit    
6     945-BR     CAT Data link -     CAT Data link communications "+" circuit    
7     Y795-GN     CAN LOW     CAN communications LOW circuit (if present)    
8     Y794-OR     CAN HIGH     CAN communications HIGH circuit (if present)    
( 1 ) The supply voltage must be 12 VDC or 24 VDC.
( 2 ) If an R-term input is not available, a DC voltage that goes high when the engine in running may be used.
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Legacy Harness SchematicConversion Harness for Caterpillar Machines
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Conversion Harness Schematic PL121SR System (Radio Only) Wiring Harness
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Radio Harness Schematic PL321SR System ( PL121SR plus the PL300 System) Harness Wiring
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PL321 Harness Schematic PL300 Digital Inputs
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Example of PL300 Digital Input SchematicFor a list of switches that may be used, refer to Special Instruction, REHS2365.System Level Schematic
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System Level Schematic PL121SR System Schematic
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PL121SR System Schematic