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MAC 6000 Hydronic Heater
Trailer Axle Manual
2106 East Indiana Ave., Bismarck, ND 58504 U.S.A. • www.macheaters.com • +1-800-272-4604
17
Rev: 07.25.2013
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 following troubleshooting chart to determine the probable cause and corrective
actions for a variety of issues with the braking system.
Please 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. 11).
Troubleshooting - Introduction
Fig. 11
