Finding Stoplight Circuit on 2018 Mazda CX-9 for Brake Controller Install
Question:
Hi! I am going to install a trailer brake controller Tekonsha 39510 on a 2018 Mazda CX-9 using a plug in harness 20127. Are you able to help me find a wire to splice into for the ‘Stop’/Red: cold side of stoplight switch? I don’t want to use a brake pedal wire because then the trailer brakes will not actuate when adaptive cruise control applies the brakes i.e. no brake pedal press. Are you able to help locate a source that will trigger braking even with cruise control braking? Thank you!
asked by: Zachary P
Expert Reply:
Hey Zach, so we haven't had the chance to install a brake controller in a 2018 Mazda CX-9 so we don't have the wire color for the stoplight circuit switch but we can still help. The easiest is to use a circuit tester like the part # PTW2993 to test all of the wires that lead to the brake pedal switch till you find the circuit that only has voltage when the brakes are applied. But when you connect to this you are simply attaching to the circuit and not cutting it and preventing it from going to the rest of the vehicle wiring like I think you might be thinking.
Or you could install a universal stoplight switch like the part # RM-751000 to give you a stoplight circuit without having to splice into the vehicle at all.
Products Referenced in This Question
Roadmaster Universal Stop Light Switch Kit
- Tow Bar Braking Systems
- Stop Light Switch
- Roadmaster
more information >
Product Page this Question was Asked From
Replacement Brake Control Plug-In Harness for Tekonsha and Draw-Tite Brake Controller 12" Long
- Accessories and Parts
- Trailer Brake Controller
- Wiring Adapter
- Plugs into Brake Controller
- Universal
- Draw-Tite
more information >
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