Installing an Electric Trailer Brake Controller on a 1994 Jeep Grand Cherokee

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Question:

what will i need to install on to a 1994 jeep grand cherockee???

asked by: Jorge A

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Expert Reply:

To install the Tekonsha P2 Brake Controller, # 90885, on your 1994 Jeep Grand Cherokee, there are 2 possible options. If your Grand Cherokee has a factory installed 7-Way trailer connector at the rear of the vehicle, then you will just need to contact the brake controller wiring to the Jeep wiring located under the dash, driver side. You will need a circuit tester like # PTW2993 to test the vehicle wires for function.

The wire that has a constant signal is the 12-volt power wire and it gets connected to the brake controller black wire. The wire that carries a signal only when the brake pedal is pressed gets connected to the brake controller red wire. To find the electric brake output wire on the vehicle, you will need to apply power to the remaining wires from an external power source. Go back to the 7-Way and use the test light on the pin in the 4 o'clock position. Whichever wire shows a signal at the 7-Way gets connected to the blue wire on the brake controller. The other wire will be the ground.

You may need to wire the brake controller directly to the battery if no power wire is present under the dash. You will need Wiring Kit # 5506. Attach one end of the wire to the black wire on the brake controller. Route the wire through the fire wall and attach the other end to the positive battery terminal via the 30 amp circuit breaker included in the kit.

If your Grand Cherokee does not have a trailer connector at the rear of the vehicle, you will first need to install Tow Ready Custom Fit Vehicle Wiring, # 118349. I have included a link to the installation details and a video showing an installation on a similar vehicle.

Next, you will need to install a 4- and 7-Way Installation Kit, # ETBC7. Plug the 4-Way into the back of the ETBC7. The remaining 4 wires will need to be hardwired to the vehicle. The white wire gets grounded to the vehicle frame. The yellow (or purple) wire gets attached to the reverse light circuit behind one of the taillights. If the trailer does not have reverse lights, this wire can be stowed out of the way. The black wire will attach to the positive terminal of the battery via a 40-amp circuit breaker. The blue wire will get attached to the brake controller blue wire.

You will need to attach the black wire on the brake controller to the positive battery terminal via a 20- or 30-amp circuit breaker (check the brake controller instructions to determine which size to use). The brake controller red wire will attach to the stop light wire on the brake switch located above the brake pedal. Find the wire that only carries a signal when the brake pedal is pressed and connect it to the brake controller red wire. I have included a link to an FAQ article that explains how to install a brake controller from scratch and a link to a video that shows the installation of an ETBC7 kit.

expert reply by: Michael H

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Answer 1

To install a brake contorller on your 1997 Grand Cherokee, you'd first need to install a 4-pole connector, using the Tow Ready #118349. How you'd proceed next will depend on the connector use on the trailer you'll want to…

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Answer 2

Having the factory fuse is perfectly fine for an aftermarket brake controller. The benefit of a circuit breaker is that it can reset itself so you do not have to replace a fuse should it blow. So you are good to go with the 30 amp factory fuse…

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Answer 3

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 4

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 6

Hey Jeremy, Typically with boat trailers the manufacturer will install hydraulic surge brakes because you don't have to worry about the water damaging wires like you would with electric brakes. That being said, if you use a heat shrink butt…

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Answer 7

If you have a vehicle specific wiring harness for a brake controller then that would indicate that you have a factory tow package and subsequently would already have a 7-way at the back of your vehicle. The universal 7-way connector #ETBC7 is meant…

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Answer 8

Hey Antoine, so the two kits you mentioned are actually really similar and honestly I would go with the part #ETBC7 if I were you. The #ETBC7L is basically the same thing minus a couple wires and breakers so you may as well get the kit that has…

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Answer 9

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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Installing an Electric Trailer Brake Controller on a 1994 Jeep Grand Cherokee

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