Forum Discussion

SGKane's avatar
SGKane
Explorer
Dec 13, 2013

Even Brake Amperage

I have had a RoadMaster Even Brake for years. My tow vehicle is a Jeep liberty, the cigarette lighter fuse that it gets power from is a 20 amp fuse. According to Roadmaster it should draw no more then 15 amps.
Lately it’s blowing that 20 amp fuse sometime during the trip; could be 10 miles or 100. I called Roadmaster tech support and they said the problem is in my Jeep and that I need to wire a plug (using their part number 9332) directly to the battery. If I was just getting this equipment I might buy that but just starting to have this problem after towing this vehicle over 60K miles so I have my doubts. I don’t believe the circuit on my Jeep is suddenly using up an additional 5 plus amps but rather I suspect the compressor in the Even Brake is getting worn and using more amperage. I don’t mind running a cord directly to the battery and fusing with a 20 ~ 25 amp fuse. My experience however with electrical motors has been that when they start using more amps it’s a very short time before they need replacing. I don’t like the idea of giving it more amperage only to have it burn up in the next trip or two.
Again the customer service person at Roadmaster was very certain in his advice. Many of you folks have a lot more experience then I do, so what thoughts do you have. Thanks in advance.
  • Found this in the owners manual:
    "Check the 12-volt outlet fuse size. It must be rated at 15 amps or
    higher. If the amperage is not sufficient, install the optional 12-volt outlet
    kit. (Refer to the “Vehicle-Specific Components” section.)
    • If the fuse is of sufficient size, unplug the break away harness connection
    at the ICX transmitter. If the fuse stops blowing, you have a short in
    the break away wiring harness. Inspect the wire for possible grounding."

    I'll try unplugging the break away harness and see what that does. Thanks Everyone.
  • RoyB wrote:
    I'm thinking when I measured my brake draw on my OFF-ROAD POPUP it was 3.0AMPS per brake assy...

    That would be 6AMPs for single axle or 12AMPs for dual axle...

    Roy Ken


    Roy, you do realize the OP IS NOT referring to TRAILER BRAKES but an actuator which presses the brake pedal in a vehicle that is being towed behind a Motor Home?

    To the OP..

    What does the manual say?

    Click HERE for manual

    From the manual..

    "Maximum amperage draw........................10.8 amps"

    10.8A should be do able on a 15A fuse but I could see you blowing one out after a while just from heat/cool fatigue.

    I suspect that your brake unit is in need of service. I didn't read the manual to see if there is any moving parts which need greasing or maintenance but if there is moving parts they may be binding due to lack of lubrication...
  • The added resistance of the power supply connector (the cig lighter plug) may be enough to add that extra amps you're seeing. You could hook up the power and measure amperage at the compressor's supply wires to see if the compressor is the issue.
  • I had brake wires get chaffed where the entered to the inside of the axle before.
  • RoyB's avatar
    RoyB
    Explorer II
    I'm thinking when I measured my brake draw on my OFF-ROAD POPUP it was 3.0AMPS per brake assy...

    That would be 6AMPs for single axle or 12AMPs for dual axle...

    Roy Ken

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