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Farmall & IHC Tractors Discussion Forum

IH 786 rear Aux Connector

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Author  [Modern View]

06-07-2018 11:13:29

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I have an IH 786 and a "new used" JD 435 round baler. The baler requires a 12V supply for normal operation.

The 786 has a "trailer type connection" at the rear of the tractor. I have "found" what I believe to be the ground pin (in the connector - 0 ohms from the pin to the chassis). There are two wires to the connector from under the tractor cab. Cannot determine for sure the color of the 2 wires. All pin volts are "mV" values. Assuming the two wires are not "getting" the required 12V'

Anyone know where the other end of these 2 wires are connected. The 786 fuse panel (under the instrument panel) has 14.5 VDC on both ends of the 3 fuses located in the panel. Tractor starts and runs good, all instruments work as they should.

I have been unable to "find" a wiring diagram for the 786 (at my dealer or on line).

Thanks in advance for any and all help.


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06-10-2018 07:05:17

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 Re: IH 786 rear Aux Connector in reply to Charliet05, 06-07-2018 11:13:29  
If it's wired like the other larger 86 series tractors there is no live wire in the 7 pin plug but there is one under the right fender that goes to the fuse panel and can be hooked up if it was designed for use with controls for silage cutters and planters that the control fit in the hole right behind the door latch that in Some tractors is also where the ash try was. My email is open if you need more help with this I can give you my phone number and talk you through it

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06-07-2018 14:58:36

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 Re: IH 786 rear Aux Connector in reply to Charliet05, 06-07-2018 11:13:29  
If that connector is two pin like on the 66,56 and older it is for implement warning lights. As such it connects to an already overloaded light switch. Thus to use this connector you would have to have the lights on. My suggestion is to go to the starter solenoid "battery" terminal, put in a 30 amp circuit breaker and run 10 gauge wire to the back of tractor or in the cab as necessary. Don't know about JD balers, but some NH balers will drastically overload your tractor's wiring.

Tractor wiring diagram should be in the operator's manual, I think they still put wiring diagrams in the OM. You do have one don't you?

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06-07-2018 19:32:37

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 Re: IH 786 rear Aux Connector in reply to TractormanNC, 06-07-2018 14:58:36  
Appreciate your quick response. Yes, I have a 786 Op manual now.

The manual references the fuse box and 3 fuses (the ones I mentioned). It also indicates that 1 fuse (4th if added) can be inserted in 1 open slot on the fuse box and can provide power to 2 wires at the back of the 786.

The connector on the 786 is a round 7 pin terminal connector just like those installed on a vehicle for trailer lighting. The manual has a drawing listing the pin locations and purpose. Only 3 pins are "wired" at the factory. One ground pin and two aux wires from the open fuse slot to pins 4 and 7. Think you solved my problem.

Many thanks,


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