A SERVICE OF

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7
Electrical 579 Family
Peterbilt Motors Company 7-18
Focusing on the PACCAR MX-13, the electrical design requires an additional relay to turn the normally LOW PTO engage
signal into a 12V HIGH signal to the engine ECU.
Chassis node connector pin reference (Port C).
The label ā€˜Cā€™ will be in raised lettering on the chassis node.
TABLE 7-5. EoA Chassis Node Guide
EOA switch number
Port C Pin location
1
2
2
3
3
5
4
6
5
8
6
9
7
11
8
12
CECU input locations for EOA Switches from the dash.
This connector is the center most connector and has 52 pins.
TABLE 7-6. EoA CECU Guide
EOA switch number
CECU (connector C)
Pin location
1
3
2
26
3
17
4
18
5
19
6
20
7
22
8
24