Wiring Diagrams to assist with Electrical Interface
Disclaimer: Our products are under continuous development. Vehicles produced after this publication may have different specifications and repair methods. When this is determined to have a significant bearing on this manual, a new edition of this file will update the changes.
Always check the latest information at the “Wiring Diagrams” location.
Utilization of Body Builder connectors ordered and provided by Volvo is strongly recommended as your power, lighting, and ground source for body installation, PTO installation, and operation. Cutting into wiring harnesses is not recommended as it may affect CAN Bus messaging. Cutting into an OEM harness will void the warranty of the harness, should it be incorrectly used to supply power to PTO equipment. Be sure to consult with your local Volvo dealer when ordering trucks to ascertain proper connectors are supplied when the vehicle is manufactured.
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Frequently Asked Questions
Can the I-Shift change gears while transmission mounted PTO is active?
When a I-Shift mounted PTO is engaged, it is only possible to move the truck in one gear (1st, 2nd, or 3rd) – the transmission will not shift gears when the PTO is active. The transmission will not disengage the PTO once it is turned on and recognized by the VECU or TECU via the factory-installed PTO switch.
On Volvo I-Shift, with PTO engaged while in neutral, and then selecting Drive the PTO stops turning. Why?
Remember that the I-Shift is an automated manual transmission with a clutch. With the PTO engaged while in neutral, when selecting Drive, the clutch is released, then the transmission shifts into gear. When the driver takes his foot off the brake pedal and presses the throttle pedal the clutch will reengage and the PTO will start to turn again. The transmission will not shift gears and driver is limited to about 6 MPH.