Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2012EXPRESS 3500 V8-4.8LREPAIR AND DIAGNOSISSTARTING AND CHARGINGBATTERYBATTERY CABLEPOSITIVESERVICE AND REPAIRBATTERY POSITIVE CABLE EXTENSION CABLE JUNCTION BLOCK REPLACEMENT
2012 Chevrolet Express 3500 V8-4.8L
Battery Positive Cable Extension Cable Junction Block Replacement
2012 Chevrolet Express 3500 V8-4.8LSECTION Battery Positive Cable Extension Cable Junction Block Replacement
Battery Positive Cable Extension Cable Junction Block Replacement
Removal Procedure
1. Disconnect the auxiliary battery negative cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.
2. Remove the positive extension cable nut from the junction block and disconnect the cable.
3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement Service and Repair.
4. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
5. Remove the positive extension cable nut from the intake air heater and disconnect the cable.
6. Disconnect the wiring harness clips.
7. Remove the battery positive cover from the underhood bused electrical center (UBEC).
8. Remove the positive extension cable nut from the UBEC terminal stud.
9. Remove the positive extension cable.
Installation Procedure
1. Position the positive extension cable and connect the wiring harness clips.
Caution:
Refer to Fastener Caution Fastener Caution.
2. Position the positive extension cable to the UBEC terminal stud and tighten the nut to 9 Nm (80 lb in).
3. Install the battery positive cover to the UBEC.
4. Position the positive extension cable to the intake air heater and tighten the nut to 4 Nm (34 lb in).
5. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
6. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement Service and Repair.
7. Position the positive extension cable to the junction block and tighten the cable nut to 8 Nm (71 lb in).
8. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection Battery Negative Cable Disconnection and Connection.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.