Product Manual

ManualsBrandsIPA ManualsLight TestersLight Ranger MUTT RV and Utility-Type Trailer Light Tester

POWER

ILLUMINATED

Max. Load: 10A/12V DC ONLY

Internal 10A Auto Resetting Fuse

30 Second Cool Down Cycle

Illuminated switch indicates power being sent to trailer.

Switch light will go out if breaker is tripped.

Warning! Do not connect any adapters or accessories

to 12V DC socket unless internal battery has been installed.

OFF

Fig. 2 - Control and Information Panel

1. Control Knob: Activates one

selected circuit at a time.

2. Power Switch: Illuminates

when adequate power source

is available and power switch

is on.

NOTE: Use the supplied battery charger or charger input no greater than 10 amps to

fully charge the internal battery of the tester. It may take up to 12 hours to charge a

fully drained battery.

WARNING: NEVER OPERATE TESTER WITH BATTERY VOLTAGE LESS THAN 11.5V.

OPERATING ELECTRONIC DEVICES ON LOW VOLTAGE MAY SHORTEN LIFE OF

AND CAUSE DAMAGE TO INTERNAL COMPONENTS. IDEAL BATTERY VOLTAGE IS

12.0V DC TO 12.5V DC.

SET-UP

• Place the tester on a ﬂ at, level surface.

• Chock trailer wheels to avoid rolling.

The Ranger MUTT

allows for the testing of trailer electrical systems without the

need of the tow vehicle. When used properly, the Ranger MUTT

can save hours

spent troubleshooting electrical issues.

CHECK 7-WAY PIN CONNECTORS: Before operating the Ranger MUTT

, be sure the

7-way socket on the front of the Ranger MUTT

and cable coming from the trailer are in

good condition and the pins are spread to the proper width to ensure good connections.

MAINTAIN 7-WAY PIN CONNECTORS: Dielectric grease should be used on all

connections to avoid corrosion. If a bad connection exists at the terminal junction, you

may get an erroneous reading and the MUTT

will not work properly. Make sure that you

have a solid connection in the 7-way socket.

FUNCTIONAL DESCRIPTIONS

The Ranger MUTT

is a diagnostic tool for trailers wired to North American style

conﬁ gurations including 7-way spade, 6-way round pin and 4/5 pin harness

connectors.

OPERATING INSTRUCTIONS

7-WAY FLAT/SPADE PIN TESTING PROCEDURE

1. Install a fully charged 12V DC battery into your Ranger MUTT

2. Plug the trailer’s 7-way spade pin cable into the front of the Ranger MUTT

Be sure to push ﬁ rmly until the key is down far enough for the ﬂ ap to lock in behind it.

3. To begin testing your trailer, turn the power switch to the “On” position. The power

switch will illuminate. Turn the control knob to the desired circuit.

4. The Ranger MUTT

will send up to 10A @ 12V DC to the selected circuit, i.e., turn

signals, brake lights, etc. Perform a visual inspection by walking around trailer to verify

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

1. To inspect electric brakes, ﬁ rst set the trailer on a ﬂ 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. Discon-

nect 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 PROTOCOL 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.