TN Trailer Brakes

[Phred]

Anyone have trailer brakes on a TN?

My D model does not, but in the manual it talks about a breaker and relay slot for electric trailer brakes.

Is this a special option or standard on the fancier S models with the electronic pto, etc...?

Fred

 

[bgott]

I dunno for sure but I'd be willing to make a bet it's an extra cost option no matter what model you have. It would also be a safe bet that it would be cheaper to run an aftermarket controller than buy New Holland's.

 

[AndyMA]

I also don't know but as an electrical engineer we always supposed to wonder. lol I looked all through my manuals and found limited information on both the fuse and relay mentioned. I'm guessing and I would confirm it with a New Holland dealer that you may not need a brake controller at all. Typically a brake controller just uses a voltage sense line which monitors whether the taillight is on and signals the controller to apply current to the brakes. A pendlum or other motion sensing device is used so that the current is proporational to the braking force required. To supply this type of signal voltage would not reguire a separate fuse or a high current relay. I suspect that by adding the fuse and relay you may have the entire brake controller. At the low speeds of the tractor, proporational control may just not be required.

Does anybody have a wiring diagram of the 7 pin DIN connector? Is it connected to the brake control relay. I well think it may be since you don't need 7 pins to supply power and in the options section of the New Holland brochure they offer the mating 7 pin plug calling it a "7 pin implement (trailer) electrical plug.

If you can't figure it out, I would be willing to put the relay and fuse in mine and "ring out" the connector to figure out the wiring diagram.

It what I suspect it true, it would be very low cost to control brakes from a TN. Also my manual talks about trailer brake light indicators in the dash board for both first and second trailers? I think the first is just the normal brake light, but I wonder where the brake light wiring for the second trailer is plugged in, its probably the 7 pin connector as well.

BTW, I think my TN75D has the "fancy" electric PTO control because the PTO is controlled by a small lever right near the hand throttle. If I turn off the tractor without disengaging the PTO, after the tractor stops running you can watch the PTO lover move and fully disengage itself. This is unlike my earlier TN75S which had the much larger mechanical lever coming out right below the steering wheel.

Andy

 

[Phred]

Guys,

Looking at it again I think the brakes may be hyrdaulic, since the mchaine does not appear to have a controller. Perhaps the fuse and relay are just to supply power to the hydraulic switch(s). There is also some discussion in my manual about a hydraulic brake valve.

I don't need it, I was just curious. You would be pulling quite a trailer to need more braking power that what the TN already offers.

Andy:
Yes that 7 pin is a PITA.
Mine is basically wired like a 7 pin RV, but not quite.
http://www.garlic.com/~secoy/trlr.htm
Sorry but I did not write down the numbers after I figured it out. I do recall that the largest one is ground.

I built a 7 pin to 6 pin adapter to power the lights on trailers, and charge aux batteries.
Basically bought the 7 pin from NH and wired a 6 pin flip cover outlet to the end of it.
The lights, blinkers, hazzards were easy to figure out by turning on each and using a DMM to measure voltages.
However, one should be tied to power and on my machine it is not. So I pulled the plug apart and found there is a wire going to it but no juice. However, the middle pin on the plug was not used. So being basically a lazy creature, I ran a big healthy 10 gauge wire to that pin and to the inside cab 4 pole outlet. This four pole is 2 grounds and 2 12V hot wires fused to 40A.
Now I have all the lights plus up to 40A of power to the aux pin on a the 6 pin outlet.
I set it up on the inside with a cheap connector attached to that expensive NH plug so I can disconnect this trailer outlet in the summer and connect up my baler.

The only bad news with this setup is that the 40Amp 4 pin is always hot. So its important to unplug when the machine is off otherise you may drain the tractor battery.
A battery isolator (ie a set of power diodes) would be a good solution to this problem.

Sounds like you have a nice TN. I skipted some of the electronic extras such as the shuttle, and pto.

Fred

 

[jcollins]

Part Number EFPN13N426AA 7 Pin Implement (trailer) Electrical Plug Costs around $20 - $25 don't know for certain if it would include trailer brakes but that is the closest thing I could find in the Price book.

 

[jcollins]

Lansdowne-Moody Web Site

After rereading the post I reliazed that you did not need the part number /forums/images/graemlins/blush.gif but rather a parts diagram of the 7 Pin connector. This is the closest thing I could find. Hope it helps. It is in a .PDF format.

 

[Phred]

Jason,

Kudos.
That is just what we are talking about.
The plug that goes into the tractor cost me about $15 plus tax from the local dealer.

Your drawing, Figure 1 on the second page, confirms my memory that the center wire is not connected on my tractor and apparently not on any of the TNs. This is the one I wired up to the 12V cab outlet.

The red wire did not appear to work on my D model but I did not check it carefully since it is not needed for a trailer.

Fred