IPA Tools 9007A Smart MUTT Head - Manual (Page 12)

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6. Using the red power selection switch (Fig. 2-H), select Power Source.
7. Check Voltage Indicator (Fig. 2-B) for green illumination. In the case of low or
weak supply voltage, yellow color illuminates. Red illumination from the Voltage
Indicator shows inadequate power supply.
Also see Warning Indicator section (pg. 18).
8. Initial power starts a test cycle through all the LEDs. This performs the
“GROUND INTEGRITY TEST.”
9. Ground Integrity Check: When the MUTT® is first turned on, notice the
green lights circling the dial. This indicates the MUTT® testing for Ground
Integrity. If there is a lack of ground, all the green lights begin to flash to alert you
to the ground problem. If you only see one green LED flashing, this indicates an
Open Circuit (Check your 7 pin connections first, then the trailer). If you do not
have Ground Integrity, the MUTT® cannot continue normal testing functions until
a solid ground is established. To troubleshoot, first you need to understand the
type of ground being used on your particular trailer. There are two types: The first
type is wired with each light receptacle grounded by the ground return wire
leading back through the 7 round pin plug at the front of the trailer. The second
type is chassis ground where the light receptacles are grounded directly to the
trailer chassis.
9a. If the trailer is grounded through the plug, the technician needs to locate the
source of this poor ground. Some systems use both wire and chassis
ground. Suggestion: Check the 7 way plug sockets and pin contacts FIRS
for loose or broken connections.
9b. If the trailer lights are chassis grounded, use the following instructions.
Your MUTT® comes supplied with a 10’ ground cable accessory. Plug in the
10’ ground cable to the MUTT® “Chassis Ground” Outlet (Fig. 3-N). Then
using the alligator clip, attach the other end of the ground cable to the
chassis of the trailer. This effectively grounds your trailer and allows testing
to continue.
10. After the “GROUND INTEGRITY TEST”, the Control Knob (Fig. 2-A) may be
rotated in either direction to select a circuit to diagnose. The corresponding
Circuit Indicator (Fig. 2-E) illuminates indicating the selected circuit.
AUTO CYCLE MODE
NOTE: Cannot be accessed when auxiliary or brake circuit is selected.
1. After Ground Integrity has been established, momentarily push and release the
Control Knob (Fig. 2-A). The Auto Cycle Indicator (Fig. 2-D) illuminates.
2. Power is applied by the MUTT ® to one circuit at a time for 5 seconds
in a clockwise direction starting from the Ground Integrity Indicator
(Fig. 2-C).
3. A 5 second delay commences before power is applied to the first circuit
automatically.