IPA Tools 9005A Super MUTT Head - Manual (Page 12)

12
ELECTRICAL/LIGHT TESTING PROCEDURES
7 ROUND PIN TRAILER TESTER
MANUAL MODE
To avoid false readings, visually inspect trailer socket for corroded and/or
squeezed pins.
Bad or broken socket pins can cause false readings. Replace socket if pins are
broken or socket appears to be out of tolerance. Clean all connections and load
socket with dielectric grease.
1. Prior to any MUTT
® testing, connect the 7-way pin connector or you will receive
erroneous readings. The MUTT ® is intended to be used while connected to a
trailer or while cable testing.
2. Secure battery connections to tester.
3. Make sure the remote key fob has been programmed (Pg. 14).
4. Insert the provided 7-way round cable to the socket on the right side of the tester.
5. Before testing trailer lights, test the 7-way pin cable with the socket on the left
side of the MUTT ® (cable tester).
6. Using the red power selection switch (Fig. 1-B, Pg. 10), select Power Source.
7. Check Voltage Indicator (Fig. 1-J, Pg. 10) 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. 16).
8. Initial power starts a test cycle through all the LEDs. This performs the Ground
Integrity test.
9. Ground Integrity Test: 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-way 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-way 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 FIRST for
loose or broken connections.
9b. If the trailer lights are chassis grounded, use the following instructions.