wiring harness is hidden under the plastic trim on the front driver side door sill or behind the panel with the hood release. someone on ebay sells a custom made wiring to connect the controller to car wiring harness but its not cheap. i just used some wire taps i had to connect the pigtail that came with the controller to the car wiring harness. wiring harness was well hidden on mine so don't give up if u can't find it first try.
i removed the coin tray under the dash and mounted it there with scotch heavy duty double sided tape since it was only temporary use to tow a travel trailer. harness stays safely stored behind the coin tray when not in use. definitely could feel it kicking in during braking and a big difference without it. i bought this used one from ebay for about $40 and it worked great. its an accelerometer based one which seems to be preferred over simple time based ones.
here are some videos i found helpful
i removed the coin tray under the dash and mounted it there with scotch heavy duty double sided tape since it was only temporary use to tow a travel trailer. harness stays safely stored behind the coin tray when not in use. definitely could feel it kicking in during braking and a big difference without it. i bought this used one from ebay for about $40 and it worked great. its an accelerometer based one which seems to be preferred over simple time based ones.
Amazon.com: Tekonsha 90160 Primus IQ Electronic Brake Control: Automotive
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here are some videos i found helpful