TN series (others may be the same) rear trailer and in cab auxiliary power connectors

   / TN series (others may be the same) rear trailer and in cab auxiliary power connectors #1  

mojoinco

Platinum Member
Joined
Mar 18, 2008
Messages
629
Location
Colorado
Tractor
TN55
Hello,
I have a TN55s (cab) model. The ROPS have at least a couple of these connectors. Mine is a 99 or 2000 (first year - can't remember which it is). FWIW.


I want to use my aux connections (in this case, for a 12v diesel pump/tank). The load is rated at 22 amps.

The operators manual didn't seem to cover much/anything about the 2 pin (pin and sleeve, next to the 3 point hitch controls), the 4 pin (on the left rear of the inside of the cab, above the 3 point hitch controls), nor the outside mounted trailer plug (see above). I guess the operator needs to just be smart enough to connect them and that's all. The mechanic will make it all work sweat heart, just plug/unplug as required.

I tried using my volt meter (key on and off) and couldn't find a hot lead on the 7 round pin connector (generic number as a reference is 5407s for the tractor side; 5407p for the trailer/implement side). My 'best solution' would be to replace this connector with a 7 blade rv style to run my pump (then the pump can be connected to my pickup if I am filling it instead). I don't need another connector style. That assumes the power lead has the current rating I want.

Here's a link to a generic wiring diagram: https://www.etrailer.com/static/ima...-diagram-connections-hdbranded-copy_2_500.jpg

I have yet to check the pin outs on the 4 pin connector in the cab, but the generic part number is s.56470 or just 56470 for the plug (cable/implement side). This seems like my most likely plug to get the power I want.

The 2 pin (pin & sleeve/coaxial) connector is just a DIN cigarette lighter socket. Plugs are cheap enough to find as a generic online (with a little work you could likely just change it to a North America cigarette light outlet/socket if hte pigtail is a common type). This is reported as an 8 amp rated plug for a roof mounted rotating beacon.




What I am looking for is:

Pin outs for each, with current rating of 'power' leads.

Power lead switched or always on. Easy to confirm on my own, but if someone already knows....

Where the related fuses are.

If not hooked up by default (I have had trucks like that) where the leads should be found.


Some of the fuse/relay information was in the user manual, but not all. I have yet to look in the repair manual I have, but I anticipate continued disappointment and regret for having even opened it (past experiences have lowered my expectations; usually not as far as they should have).


A few items are found here, though if you know of differences, pleas list them. If nothing else maybe the information is here for the next person.

 
   / TN series (others may be the same) rear trailer and in cab auxiliary power connectors #2  
I found this on the 4 pin:

  • Pin 1 (Red wire): Constant 12V or 24V power from the battery.
  • Pin 2 (Brown wire): Switched 12V or 24V power, controlled by the ignition key.
  • Pin 3 (Black wire): Ground.
  • Pin 4 (Often unused or another ground): Could serve as a secondary ground or be left open for future use.
 
   / TN series (others may be the same) rear trailer and in cab auxiliary power connectors #3  
Here is what the standards are for 7 pin ag connectors. I borrowed it from a JD manual. I cannot comment on if the pins are switched, but I would assume they are so you do not drain the battery when hooked to a trailer.

Trailer Plug Wiring 7 pin.JPG
 

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