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How to Measure Voltage
System voltage is measured at the magnets by connecting the voltmeter to the
two magnet lead wires at any brake. This may be accomplished by using a pin
probe inserted through the insulation of the wires. The engine of the towing
vehicle should be running when checking the voltage so that a low battery will
not affect the readings.
Voltage in the system should
begin at 0 volts and, as the
controller bar is slowly actuated,
should gradually increase to
about 12 volts. If the controller
does not produce this voltage
control, consult your controller
manual.
The threshold voltage of a
controller is the voltage applied
to the brakes when the controller rst turns on. Lower threshold voltage will
provide for smoother braking. If the threshold voltage is too high, the brakes may
feel grabby and harsh.
How to Measure Amperage
System amperage is the current owing in the system when all the magnets are
energized. The amperage will vary in proportion to the voltage. The engine of
the tow vehicle should be running with the trailer connected when checking the
trailer braking system.
One place to measure system amperage is at the BLUE wire of the controller,
which is the output to the brakes. The BLUE wire must be disconnected and the
ammeter put in series into the line. System amperage draw should be as noted
in the following table. Make sure your ammeter has sufcient capacity and note
polarity to prevent damaging your ammeter.
VOLTMETER
Braking Systems - Electric
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