brake controller voltage issues...
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Senior User
Joined: Jul 2007
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From: Holland, Michigan
brake controller voltage issues...
I have a 2001 F250 PSD and I noticed that my brake controller was no longer working the other day so I purchased a new one. When I went to install it I check the voltage in the factory wire harness for the brake controller and in the blue wire (trailer feed) I was getting 2.4 volts without hitting the brake and when hitting the brake I was only getting approximatly 6.3 volts (all with the truck running.) In the instructions for the brake controller it shows that I am suppose to have 12 volts when brake is pressed and to confirm we checked it on my dads Excursion and it was reading 11.9 volts pressed and 0 volts with no brake. I know there is an issue somewhere I just cant seem to find it and I was wondering whether anyone had any suggestions on how to troubleshoot or has had this issue before.
The brake contoller I purchased is Activator III 1-4 Axle Brake Control - #5520
The brake contoller I purchased is Activator III 1-4 Axle Brake Control - #5520
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Joined: Nov 2006
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From: house springs,mo
I would also post ur problem in the (Towing,Trailers and 5th wheel) section there pretty good with that wiring stuff!
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Senior User
Joined: Jul 2007
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From: Holland, Michigan
I will put it in that section thanks! I checked my fuses under the hood and the dash and every one of them appeared to be good. When I tested it i tested the wires coming directly out of the harness without the brake controller hooked up.
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Joined: Feb 2008
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From: mechanicsville VA
first check voltage on c279 (hot side on BPP)
should be 12 volts
then check the other side of that switch with the brake pedal out and in. yours should be getting the same readings that you got off the blue wire for the brakes. but it should read 0 out and 12 in.
if its reading voltage while brake petal is out the unplug the relay and then check it again, if its still reading voltage then your multifunction switch is backfeeding, to be sure check c230b Lg wire (in picture its at the top right of the multi switch)should be reading something
if you unplug the BPP switch and there is no voltage then your BPP switch is bad. let us know the readings you find.
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Joined: Feb 2008
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From: mechanicsville VA
What were the test results?
Hotshot
Joined: Jan 2010
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From: Bristol, TN.
I am wondering if it might be faster for you to simply forget the factory connection to the controller and wire the controller in as though the factory harness was not there. In the olden days, that is how we all did it.
All controllers come with wiring instructions and it is pretty basic. Just a thought,
Steve
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Senior User
Joined: Jul 2007
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From: Holland, Michigan
the test results were the same as before 2.4 volts without hitting the brake and when hitting the brake I was only getting approximately 6.3 volts (all with the truck running.)
