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Old 06-21-2019, 04:14 PM   #1
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Tow lights for toad vehicle don't work if headlights are on

We have a class C and a Jeep that we tow behind. I just noticed today when hooking up the vehicle that the lights (brakes and turn signals) on the tow vehicle do not work if the headlights are on in the RV.

If the headlights are off on the RV, everything (turn signals and brakes) works fine on the tow vehicle. If the headlights are on in the RV, the parking lights are on in the tow vehicle, but the brakes and turn signals don't work.

Any ideas is this something wrong with the wiring on the RV or the wiring in the tow vehicle? We just got a new tow vehicle this year. But I never bothered to check the hookups in the past with the RV headlights on. It may have been like this with the old tow vehicle and I never knew it.
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Old 06-23-2019, 08:41 AM   #2
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What about when you only have the parking lights on on the RV do the lights on the Jeep still work correctly?
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Old 06-23-2019, 10:54 AM   #3
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The parking lights on the toad shouldn’t be on at any time, just the rear running and brake lights. What kind of harness did you put in the Jeep?
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Old 06-23-2019, 12:32 PM   #4
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Not sure what the difference is between parking lights and running lights. Maybe we are talking about the same thing.

The harness that was put in the Jeep is this.
https://www.amazon.com/Blue-Ox-BX882...25710767&psc=1
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Old 06-23-2019, 12:35 PM   #5
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Quote:
Originally Posted by SeaDog View Post
What about when you only have the parking lights on on the RV do the lights on the Jeep still work correctly?
I did not try that. I will go over this week and give that a try.

I'm just trying to figure out do I take it to the place that wired the Jeep and tell them something is wrong with that wiring? Or take it to a RV place near me and have them look at the RV. Unfortunately the place where the car was wired is much further away.
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Old 06-23-2019, 03:48 PM   #6
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Quote:
Originally Posted by johnlantz View Post
Not sure what the difference is between parking lights and running lights. Maybe we are talking about the same thing.

The harness that was put in the Jeep is this.
https://www.amazon.com/Blue-Ox-BX882...25710767&psc=1
Thatís only the connector cable between the RV and the Jeep. Once it connects you have to have something like this:

https://www.amazon.com/Hopkins-56200...gateway&sr=8-1

That setup illuminates only the two taillight/brake/signal lights on the rear of the Jeep. Thatís all you need.
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Old 06-23-2019, 06:57 PM   #7
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Originally Posted by emm-dee View Post
Thatís only the connector cable between the RV and the Jeep. Once it connects you have to have something like this:

https://www.amazon.com/Hopkins-56200...gateway&sr=8-1

That setup illuminates only the two taillight/brake/signal lights on the rear of the Jeep. Thatís all you need.
I have no idea on what the wiring the place did when the rigged the car for towing It does illuminate the signals and brakes on the Jeep when I don't have the headlights on in the RV. But once I turn on the headlights in the RV, the turn signals and brake lights no longer work in the Jeep. Instead the tail lights are on in the Jeep. Not the brake light or turn signals.

Thanks for the input. I'll start with calling the place that rigged the car and see what they say. If it's not them, then i'll try the RV shop.
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Old 06-23-2019, 07:22 PM   #8
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Quote:
Originally Posted by johnlantz View Post
I have no idea on what the wiring the place did when the rigged the car for towing It does illuminate the signals and brakes on the Jeep when I don't have the headlights on in the RV. But once I turn on the headlights in the RV, the turn signals and brake lights no longer work in the Jeep. Instead the tail lights are on in the Jeep. Not the brake light or turn signals.

Thanks for the input. I'll start with calling the place that rigged the car and see what they say. If it's not them, then i'll try the RV shop.
Easy answer. You have a bad installation in the Jeep.
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Old 06-24-2019, 02:11 AM   #9
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Check the ground connections.
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Old 06-24-2019, 03:08 PM   #10
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Depending on which Jeep you have, there can be two wiring configurations. One is the #6 posting of a Hopkins kit. This wiring is integrated into the OEM wiring. For the second type, some Jeeps have space in their tail light assemblies to have a completely independent brake/turn/tail system. I used the second type with a Blue Ox kit installed on a 2012 Jeep Liberty.

Also, a bad ground will do some really weird things with lights. Your symptoms could be one of them. The Sunseeker, as most newer vehicles, is factory wired so that the headlights, tail/turn/brake brake lights are on different circuits that the 7-pin harness and they are fused separately.

The first picture you posted is called an umbilical. For the TV to the toad setup, it should be a 7-pin at the Sunseeker, and a 6-pin at the front of the Jeep. One of those wire activates with the ignition on the Sunseeker. It can be used to supply power for a battery tender on the toad battery.
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