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Wiring Adapter to Install Hayes Synchronizer # HA81725 Brake Controller in 2008 Toyota Tacoma


I have a 2008 Toyota Tacoma 6 Cyl, 4WD with towing package. I want to mount a Hayes 81725 Syncronizer Brake Controller and need a cable to connect the 4 pole connector on the controller to the 5 prong Toyota plug in the wiring harness. The 5 pole Toyota end of the cable would have to have a male connector. The hole pattern looks somewhat like this: - - - _ _ It has three small horizontal holes with two wider horizontal holes below them. Do you have such an item? If not do you have the plugs with pigtails to make such a cable? Do you have a wiring diagram for building the cable? Do I have to purchase one from Toyota? Thanks in advance for your help.


Expert Reply:

Hayes does indeed offer a brake controller wiring adapter that's compatible with the 2008 Toyota Tacoma that's equipped with the factory 7-way trailer connector, part # HA81785-HBC.

I've provided you a photo of what the connector that will plug in under the dash looks like. It's a four pin connector, and you can clearly see the pin-out in the photo I've edited for you.

Your factory connector under the dash will have 5 pins, but the aftermarket wiring adapters and brake controllers only use four of the circuits. The extra circuit is for an illumination circuit that isn't needed.

click to enlarge
expert reply by:
Mike L

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