7
OPERATING INSTRUCTIONS
7-WAY PIN TESTING PROCEDURE (Both #9101 and #9102)
1. Install a fully charged 12V DC battery into your Ranger MUTT
®
.
2. Plug the trailer’s 7-way pin cable into the front of the Ranger MUTT
®
. Be sure to
push rmly until the key is down far enough for the ap to lock in behind it.
3. To begin testing your trailer, turn the Control Knob to the desired circuit.
4. The Ranger MUTT
®
will send up to 10A @ 12V DC to the selected circuit, e.g., turn
signals, brake lights, etc. Perform a visual inspection by walking around the trailer to
verify the proper lights are illuminated.
5. Step 4 should be repeated for all lighting circuits.
WARNING: LEFT TURN AND RIGHT TURN SIGNALS FLASHING TOO QUICKLY OR
TOO SLOWLY ARE AN INDICATION OF LOW BATTERY VOLTAGE. STOP AND CHARGE
BATTERY IMMEDIATELY TO PREVENT DAMAGE TO TURN SIGNAL FLASHERS.
ELECTRIC BRAKE TESTING (#9101 Only)
1. To inspect electric brakes, rst set the trailer on a at, level surface. Place chocks in
front and behind the wheels on one side of the trailer. Proceed to jack up the un-
chocked side of the trailer until the tires are off the ground. Follow standard safety
protocols such as using jack stands and not placing yourself in harm’s way.
2. Ensure that the break-away cable is not disconnected. Try to turn the trailer tires that
are off the ground by hand. They should turn with little effort.
3. Turn the Ranger MUTT
®
Control Knob to the circuit labeled “Electric Brake.” Then
return to the same tires and try to turn them by hand again. You should not be able
to move them. If you are able to move the tires while the electric brake is selected,
this indicates that something is wrong or your trailer brakes are out of adjustment.
Disconnect the Ranger MUTT
®
and inspect the braking system further to identify the
source of failure.
4. To test the brakes on the other side of the trailer, let the trailer down from the jack
stands and repeat set-up procedure described in Step 1.
NOTE: The trailer electric brakes are applied when they receive 12-volts from the towing
vehicle. During this test, the Ranger MUTT
®
will simulate the tow vehicle by providing the
full amount of power the trailer brakes can draw. As a general rule, each wheel or electric
brake will draw approximately 1.5 - 3 amps. A trailer with four wheels equipped with
electric brakes should draw a total load of 6 or more amps on the electric brake circuit.
While testing, the use of an amp meter may be helpful when troubleshooting exact causes
of electric brake failure.
WARNING: BE SURE TO CHOCK ALL TRAILER WHEELS BEFORE USING THIS TOOL
AND ESPECIALLY BEFORE JACKING UP ONE SIDE OF THE TRAILER. FOLLOW
ALL STANDARD PROTOCOLS AND COMMON SENSE PRACTICES INVOLVED
INCLUDING WORKING WITH A TRAILER ON A FLAT, SOLID SURFACE AND USING
PROPERLY RATED JACK STANDS. KEEP HANDS AND FEET FREE FROM TRAILER
AT ALL TIMES.
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