WABCO iABS 2S/1M Standard, Maintenance Manual

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Appendix IV
13 Appendix IV
13.1 Vehicle Electrical Grounding Guidelines
Ensure that the vehicle includes a correct common chassis ground point. A common chassis ground point
connects the trailer frame/chassis to the ground pin of the J560 seven-way connector and will protect the
vehicle electrical system from unwanted electrical noise.
Common chassis ground can be veri fi ed by measuring the resistance between the J560 ground pin and the
vehicle chassis (or frame) and con fi rming that the resistance is less than 10 Ohm (<10 Ω ). If this is not the
case, the electrical contact at the common chassis ground point is not suf fi cient or not present. If a common
chassis ground point is present, but not suf fi cient, ensure that there is no paint or debris inhibiting electrical
contact at the ground point. If a common chassis ground point is not present, WABCO recommends adding
one.
NOTE: Do not add more than one common chassis ground point (connecting the J560 ground pin to the
chassis) to avoid potential ground shifts within the vehicle electrical system.
Additionally, all standard trailer components, such as axles, should also be electrically connected to the
common chassis ground. If the axles are not correctly grounded to the chassis, a ground strap electrically
connecting the axle to the chassis may be added to ensure adequate protection from unwanted electrical
noise. This can be veri
fi ed by measuring the resistance between the vehicle chassis/frame and the other
trailer component, then con fi rming that the resistance is less than 10 Ohm (< 10 Ω ).
For more details concerning correct vehicle grounding, reference SAE standard J1908.
Note during welding work on the trailer:
 Disconnect power to the trailer.

Disconnect all cable connections to devices and components and protect the plug-ins and connections
from contamination and humidity.
 Always connect the grounding electrode directly with the metal next to the welding position when
welding, to prevent magnetic
fi elds and current fl ow via the cable or components.

Make sure that grounding connections are robust by removing paint or rust at the connection points.
 Prevent heat in fl uences from the welding activity on devices and cabling when welding.
Note during electrostatic painting the trailer frame or bogie:
 Disconnect all cable connections to devices and components and protect the plug-ins and connections
from contamination and humidity.