Hey Josh,
The Custom Wiring Adapter for Hayes Brake Controllers # HA81785-HBC you used to plug in your Hayes Energize III+ Trailer Brake Controller # HA81742B would have a ground. Since it's lighting up we know it's getting power and this isn't a fuse issue so it's likely a wiring issue with either the 7-way on your Lexus or with the trailer wiring.
You'll want to use a multimeter # PT89ZR to test the brake controller output pin on the Lexus' 7-way when the manual override is being... view full answer...
The brake controller port (if present) on your 2005 Lexus GX 470 should be located underneath the driver side dash taped to another harness near the emergency brake pedal. Please note that these are not always easy to find so you will just want to be patient. If you are using a Tekonsha brake controller like the Tekonsha Prodigy P3 part # 90195 then the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3040-P is indeed correct.
There is also a chance that your Lexus... view full answer...
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