Troubleshooting Jeep Lights After Installing Flat Tow Diode Kit

Question

Question:

Motorhome towing a 2018 Jeep have installed the diodes in the Jeep but lights still not working what could cause this

asked by: Matt

0

Expert Reply:

The best troubleshooting step I can recommend based on the information provided is to apply a circuit tester like # PTW2992 to the wiring upstream of the diodes. In other words, you want to test to confirm that light power from the motorhome harness is entering the diodes. You do the same test on the wiring from the Jeep itself.

If you refer to the photo I linked you'll see that the diode has both a motorhome feed (yellow wire, top left) and a vehicle feed (black wire, top left). When you test the yellow wire with the Jeep connected to the motorhome harness and the motorhome lights are operating you should have a signal on the yellow wire. When you are not towing the Jeep and you simply apply the brake or turn on the headlights you should detect a signal from the Jeep itself on the black wire.

You can also refer to the two inked articles.

expert reply by: Adam R

0

click to enlarge

Answer 1

Sounds like maybe the diode of the wiring kit on your vehicle has gone bad. You can bypass the diode to get the brake light to get it to work again, or you can replace the diode with part #RM-790 for if you ever planned to flat tow the vehicle again.…

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Answer 2

The only pin that should be continuously showing 12V power on the 7-Way connector on your vehicle is the 12V power circuit which is normally the black wire but not always. In 7-way wiring the 12V auxiliary power feed is carried on the contact at the…

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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

When it comes to choosing between the Blue Ox Patriot #BLU37TR and the Brake Buddy Select 3 #HM39524, these systems are extremely similar in their setup and functionality. Both of these systems provide proportional braking in a compact and easy to…

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Answer 5

What you need is a light kit specifically for flat-towing. The Plug-N-Tow TM Vehicle Wiring Harness, #42615, would be if the Jeep were towing a trailer and not for activating its lights while it is being towed. There are a few options for lighting…

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Answer 6

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 7

Hey Robert, for your 2016 Jeep Wrangler using the Ready Brute Elite II tow bar you can use the Blue Ox Base Plate Kit #BX1126 with the Blue Ox Base Plate Adapter Brackets for Ready Brute Elite Tow Bars #BX88297. From here, to complete your flat…

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Answer 8

Either way is correct. It depends on if you want to keep the semi-style 7-Way (if you need to tow that type of trailer) or if you will never be towing a semi-trailer. If you need to keep the 7-Way semi active on the truck, then you would need to make…

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Answer 9

The closest thing we have is the installation of the #RM-8700 on a 2014 Wrangler which I attached below. Although it isn't exactly the same you can use it as a general reference coupled with the written instructions.

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Answer 10

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 11

There is only one difference between the Curt Trailer Hitch Receiver #C13176 and etrailer Trailer Hitch Receiver #e98909 that fit your 2020 Chevrolet Colorado, which is the finish. The Curt trailer hitch has a glossy black finish while the etrailer…

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Troubleshooting Jeep Lights After Installing Flat Tow Diode Kit

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