8.3 Ground Integrity Test
Each time the Alpha MUTT
®
is powered on, it automatically runs a Ground Integrity test. A good ground
connection must be established for the tester to operate a trailer’s electrical system.
1. Immediately after power up, the green lights around the Circuit Control knob will illuminate.
2. A solid/healthy ground connection is indicated by a steady illuminated Ground Integrity indicator.
3. Bad/poor ground or bad cable condition is indicated by all the LEDs blinking simultaneously. See
Establishing a Chassis Ground below.
4. When one or more green circuit LEDs blink while the Ground Integrity indicator is steadily
illuminated, it indicates that a solid ground has been established, but an open circuit has been
detected. Refer to Part 8.4 Fault Indication - Open Circuit.
Chassis And Pin Grounds
A poor ground warning may be an indication that the
connected trailer is only wired for chassis ground. There
are two ground types. 1) Pin Ground: The ground wire
from each light assembly is wired through the main
harness up into the trailer plug. 2) Chassis Ground: The
ground wire from each light assembly is grounded directly
to the trailer chassis. Ground with the truck is established
at the king pin.
Establishing a Chassis Ground
1. To simulate the king pin on a chassis ground connection
and bypass the ground integrity fault, plug a chassis
ground cable into the Chassis Ground outlet on the front,
bottom panel of the Alpha MUTT
®
.
2. Attach the other end of the chassis ground cable to the
chassis of the trailer.
3. Be sure that you are attaching to a clean, dry metal for an
effective ground.
NOTE: DO NOT assume a bad ground warning is a result of a faulty trailer. Check cable connection.
NOTE: The Alpha MUTT
®
cannot monitor ground condition while selecting circuits. A sudden loss of
ground while testing circuits will present as open circuits on each selected circuit. To confirm ground
status, turn control knob back to the ground position. While in ground position, the Alpha MUTT
®
continuingly monitors the ground status.
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