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If the resistance is less than 3 ohms:
The system is grounded sufficiently and no further action is necessary.
If the resistance is greater than 3 ohms:
A grounding strap needs to be attached between the mounting bracket and a
good ground in the cab.
6.1 GROUNDING STRAP INSTALLATION
Mobile Installations
One end of the strap should be attached to the SCM mounting bracket per the following
picture:
Use a star washer between the lug and the bracket. Make sure that the washer
penetrated the paint on the bracket. Attach the other end of the strap to a convenient
ground point in the cab.
The bolt used to ground the seat ground strap on the seat base is usually a good
location. Measure the resistance between the silver hex head screw and (Pin3) again to
make sure that the system is grounded sufficiently.
If the resistance is still greater than 3 ohms:
• Make sure that the proper metal to metal contact is being made on both ends
of the grounding strap. Clean any paint or oxidation that may have
accumulated on the grounding point. Recheck the resistance again.
• Attach the ground strap to another ground point in the cab and repeat the
process.
Fixed Installations
If the LectroCount
3
is being installed in a fixed installation, a ground wire should be
connected between one of the silver hex head screws on the SCM chassis and earth
ground on the power supply.
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