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Thread: No Brakes

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    No Brakes

    Have a 2020 Reflection 315. The electric brakes are not working. Have had both plugs replaced, trailer and truck. Ford dealer has replaced the brake controller. Did not help. Dealer then connected a different truck to the trailer and still nothing. Both trucks show a "trailer wire fault". All other lights on the trailer work. Turn, brake and lights. The only thing not working are the trailer brakes. In reviewing the wiring diagram, it shows a 400a in line fuse. Does anyone know where the fuse is located? Any other suggestion would be very helpful. Thanks

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    Site Sponsor 315RLTSinPA's Avatar
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    There shouldn't be a fuse on the brake wires.
    2018 Reflection 315RLTS
    2013 F350 Ultimate Lariat 6.7L/CC/LB/FX4

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    Paid my dues 😁 FT4NOW's Avatar
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    The trailer wiring fault message on a Ford means there is a short on the trailer brake circuit and will not apply power to the brakes in that case.

    Have you recently replaced wheel hubs or anything? Maybe a wire got pinched and now is contacting the frame. Also could be an issue with your break away switch failing. If you have a multimeter, you can start troubleshooting.

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    Big Traveler geotex1's Avatar
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    Trailer-side issue. Sounds like someone does not know how to actually troubleshoot trailer brakes. Start at the junction box for the trailer umbilical. Connections are notoriously poor there. Then check the connections at the backing plates. Also notoriously problematic.
    Last edited by geotex1; 04-23-2021 at 07:17 AM.
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    I have had to fix wiring for the brakes on my trailer. I found several pinched/frayed wires (all near the axle). First thing I would do, is get under the trailer, and start from the plug and trace the wires, looking for obvious issue's. Usually, the fault is not in the brake drum. After that, the multi-meter would come out.
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    Two very easy and quick checks to see if RV brakes are working are:
    1. with truck disconnected pull emergency brake disconnect pin... RV brakes should all lock up and you can hear a slight hum if you
    listen at the hubs of both axles
    2. With a multi meter measure on the RV 7 way connector at pins 1 and 2 with MM is OHMS scale... Resistance should read around 1.6ish ohms of resistance

    You are measuring thru the RV 7 way plug wiring back to ALL FOUR magnets which are wired in parallel.. if this reading is different then
    you will need to remover the two wires on the back side of each brake backing plate and measure the resistance of each Brake magnet

    Each one should measure around 3.8 ohms .. if these all read good then your issue is between the RV 7 way plug wiring back to where each
    brake magnet wire branches off from the main feed line

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    Site Sponsor AZMike's Avatar
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    Quote Originally Posted by Viper02 View Post
    Two very easy and quick checks to see if RV brakes are working are:
    1. with truck disconnected pull emergency brake disconnect pin... RV brakes should all lock up and you can hear a slight hum if you
    listen at the hubs of both axles
    2. With a multi meter measure on the RV 7 way connector at pins 1 and 2 with MM is OHMS scale... Resistance should read around 1.6ish ohms of resistance

    You are measuring thru the RV 7 way plug wiring back to ALL FOUR magnets which are wired in parallel.. if this reading is different then
    you will need to remover the two wires on the back side of each brake backing plate and measure the resistance of each Brake magnet

    Each one should measure around 3.8 ohms .. if these all read good then your issue is between the RV 7 way plug wiring back to where each
    brake magnet wire branches off from the main feed line
    Just a question - Why would you hear a hum at the hubs? The brake magnets are powered by DC current. If they had AC current going to them, then you should most definitely hear a hum.
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    Site Sponsor JCR GD's Avatar
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    Another area to check is where the wires go in and out of the axles. Many installers are not careful and the wires get "stripped" as they are pulled through the holes causing a short.
    Jim (& Sharon)
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    You will hear the brake magnets hum because if the magnet coils

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    If the OP has a clamp on amp meter he can also measure amp draw at each magnet to verify operation of that brake

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