brake controller

[DOCTOR-MX]

I just change my brake controller and works fine, but when I put the Hazard flashers on, I felt pulsing in the trailer brakes. I read that with a pulse preventer is required, but where I connect it, because my truck (F250 PSD 1996) has a factory harness, and I connect the brake controller to it, and the pulse preventer´s instructions says: the yellow wire to the cold brake wire, I think it is in the switch in the brake pedal, but how I know what is it? and I only cut it or what? Or I have to connect between other wire from the brake controller?
I hope I could explain myself, sorry for my spelling.

Thanks for any input.

[thecatsandi]

That should not be happening.
Has someone installed after market harness or otherwise modified the trailer hookups?
The flashers and the Brakes should be independent even though they are using the same lights.

[scottanlily]

the brake switch is where you find the cold side wire as your thinking .you
need a 12volt test light ,and probe the leads at the brake switch at the upper part of the pedal under the dash area /pedal .The cold or off (no voltage ,test light not on )when pedal is NOT depressed ,one side will light the test light .The cold off side is where you hook up wire .
you can get the BLUE connectors that attach the wire to your brake switch wire in parallell ,one crimps over the existing wire and the new wire next to it in the one connector ,no cutting required .hope this will help ,and the flashers
are feeding power to your brakes on the trailer .Blue connectors at your auto parts store,they can show you how they crimp on ,easy

Scott of scottanlily

[DOCTOR-MX]

Thanks for your answers thecatsandi and scottanlily.
1.- Nobody has installed after market harness, neither modified the trailer hookups. The installation instructions of the brake controller indicates that if the brake control is set aggressively it could be pass, so I think it is normal.
2.- I´m going to do what scottanlily advised to me.
Only few questions, to crimp is the same that to tap? An when you talk about the new wire you refer to the wire of the pulse preventer which is in this link (yellow wire)?
http://www.etrailer.com/mm5/merchant...&Category_Code=
do you know about it?

thanks again

[overlander63]

By crimp, he means to attach, usually with an insulated connector that is squeezed, or crimped, in place to secure the connection.

[scottanlily]

DOCTOR MX

Yes to both your questions .

thanks Terry .

Scott

[DOCTOR-MX]

to all of you.
I learned several things with you.

Again, thanks.