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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
20
Rev: 07.25.2013
AMPERAGE CHART
Low or no voltage are the most common problem with the Braking System. Amperage
at the brakes is also a relatively common issue. Common causes of these conditions
are:
1. Low quality electrical connections
2. Open circuits
3. Insufficient wire gauge
4. Broken wires
5. Blown fuses (fusing of brakes is not recommended)
6. Short circuits (indicated by high amperage)
Possible causes of shorts are:
1. Shorted magnet coils
2. Bare wires contacting a grounded object
Finding the cause of a short circuit in the system is done by isolating one section at a
time. If the high amperage reading drops to zero by unplugging the trailer, then the
short is in the trailer. If the amperage reading remains high with all the brake magnets
disconnected, the short is in the trailer wiring.
Amps/
Magnet
Two
Brakes
Four
Brakes
Six Brakes
3.0
6.0
12.0
18.0
All electrical troubleshooting procedures should start at the controller. Most
complaints regarding brake harshness or malfunction are traceable to improperly
adjusted or nonfunctional controllers. See your controller manufacturer’s data for
proper adjustment and testing procedures. For best results, all the connection
points in the brake wiring should be sealed to prevent corrosion. Loose or corroded
connectors will cause an increase in resistance which reduces the voltage available for
the brake magnets.
Amperage Chart
