7-Way and Brake Controller Recommendation for 2004 Lexus RX 330

Question

Question:

Hi, I have a 2004 RX330 and will be installing a hitch and 7 pin connector/harness to prepare to tow a light-weight travel trailer with electric brakes. Can you direct me to the p/n for the harness which includes a 7 pin connector, rather than the standard electrical 4 pin connector? Thanks,

asked by: Eric

0

Expert Reply:

You will need to start with a 4-way (if you do not have one). For that you would want the # 118478.

From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well.

For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup.

expert reply by: Jameson C

0

Dustin

5/29/2025

Hello, I have a 2004 Lexus RX330. When installing the brake controller part #90885 can I extend the red wire from the back of the brake controller to the rear of the car and splice it into the red wire that that plugs into the passenger side of the tail lights from the 4 way flat wiring harness part # 118478? Will that work as a source for the brake signal for the controller? Thanks

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Jameson C.

5/29/2025

@Dustin the reason you can't do that is that the blinker activates that circuit too so you'd get pulsing trailer brakes when the blinker is on. It has to be a dedicated stoplight circuit.

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Dustin

5/29/2025

@JamesonC That makes sense. What wire on the lexus is the correct one to splice into? Thanks

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Jameson C.

5/30/2025

@Dustin Normally it's found at the brake pedal switch. You'd want to test all of the wires that run to the brake pedal till you find one that has 12 volts only when the brakes are applied and use it. Sometimes people will use the third brake light circuit at the rear of the vehicle but that's pretty rare since you have to run wire all the way to the rear of the vehicle.

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Answer 1

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Answer 2

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Answer 3

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Answer 4

The best brake controller option to go with is one that activates the brakes proportionally instead of time delayed. A proportional brake controller will activate the trailer brakes at the same time and with the same intensity as the tow vehicle…

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Answer 5

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Answer 6

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Answer 7

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 8

If your vehicle has a factory brake controller plug, you can simply use the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers – Ford, Item #3034-P, which will connect to the vehicle plug and the brake controller. On the new E-450…

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Answer 9

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Answer 10

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Answer 11

Hey Johnathin! What kind of camper do you have? For a complete setup on your 2004 Tacoma you will need a hitch, wiring, brake controller, and ball mount. Starting with the hitch I recommend the etrailer #e64AR. This Class III hitch has a 2"…

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Answer 12

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7-Way and Brake Controller Recommendation for 2004 Lexus RX 330

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