Lippert Components Trailer Axle (Standard) - Manual (Page 18)

Rev: 03.18.2014
Page 18
Trailer Axle Owners Manual FULL
Introduction to Troubleshooting
The following section is a guideline for ensuring operation of your braking system. The safety of you, those
traveling with you and those sharing the road paramount and it starts with the ability to safely stop the tow
vehicle and the towed vehicle.
Troubleshooting
Most brake malfunctions can be corrected by utilizing the Troubleshooting Chart on the next page.
Mechanical failure is the most common form of malfunction, however, if the brake system fails and it’s not
mechanical, it is usually electrical. A Voltmeter and Ammeter are essential tools to diagnose these problems.
Mechanical problems are mostly self-evident; something is bent or broken. Consult the troubleshooting
chart on Page 19 to determine the probable cause and corrective actions for a variety of issues with the
braking system.
Remember to use only Lippert Components, Inc. replacement parts on these systems. Consult the Limited
Warranty or call our Service Department for any other related issues.
Measuring Voltage
The Braking System voltage is measured at the two lead wires of the magnet on any brake. Use the pin
probes inserted through the insulation of the lead wires. To ensure that the battery is indicating a full
charge, the towing vehicle engine should be running with the trailer coupler connected when checking the
voltage.
Voltage in the system should begin at 0 volts and, as the brake pedal of the tow vehicle is applied, voltage
will gradually increase to about 12 volts. If the system does not indicate at least 12 volts, problems may
occur in the wiring of the system, the battery or alternator of the tow vehicle.
When the brakes are applied, a gradual increase in voltage is preferable to a quick increase to 12 volts. A
gradual increase in voltage ensures smooth and firm trailer braking. A quick increase in voltage will cause
the braking system to feel like the trailer is grabbing too quickly.
Taking a Voltage reading is usually done with probes inserted into the wire connector (Fig. 10).
Fig. 10