IPA Tools 9008-DL Super MUTT Deluxe Edition - 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 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. 16).
4. Insert the provided 7 round cable to the socket on the right side of the tester.
5. Before testing trailer lights, test the 7 pin cable with the socket on the left side
of the MUTT ® (cable tester).
6. Using the red power selection switch (fig. 3-B), select Power Source.
7. Check Voltage Indicator (fig. 3-J) 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. 17).
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 pin connections first, then the trailer). If you do
not have Ground Integrity, the MUTT ® cannot continue normal testing func-
tions 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 FIRST 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.