Lippert Components Trailer Axle (Standard) - Manual (Page 20)

Rev: 03.18.2014
Page 20
Trailer Axle Owners Manual FULL
Measuring Amperage
The Braking System amperage is the amount of current flowing through the system when all magnets have
been energized. The amperage will change proportionately with the voltage. 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.
If a resistor is used in the brake system, it must be set at zero or bypassed completely to obtain the
maximum amperage reading. Individual amperage draw can be measured by inserting the ammeter in the
line at the magnet you want to check. Disconnect one of the magnet lead wire connectors and attach the
ammeter between the two wires. Consult Amperage Chart on the next page for normal amp readings.
Make sure that the wires are properly reconnected and sealed after testing is completed.
Testing for Amperage can be done with probes (Fig. 11) or alligator clips on the leads or an amp clamp
(Fig. 12).
Fig. 11 Fig. 12