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  #1  
Old 03-27-2020, 07:52 PM
Live to jig Live to jig is offline
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Default Backup lights always on

Just picked up a 2020 Ranger with a 7 pin trailer plug, when I plug into my tow vehicle a 2013 BMW X5, the backup lights on the trailer are on constantly and the brake lights don't work on the trailer as well. Are imports wired differently? Thanks in advance
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  #2  
Old 03-27-2020, 08:22 PM
Snowking Snowking is offline
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Even some of the American trucks are not always wired the same. It sometimes is add on truck trailer plug in not done at the factory. A 12 volt indicator light electric tester can help you figure out the wiring on your truck. The problem is if you switch the wires around on your trailer. Your trailer would not work on other trucks. I would try to test your trailer on a different truck. Make sure the trailer is wired from the factory right.
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Last edited by Snowking; 03-27-2020 at 08:24 PM.
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  #3  
Old 03-28-2020, 08:49 AM
REW REW is offline
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Copy Snowkings comments.

Bottom line - test and find out which contact in the trailer does what function.

Then, check your trucks wiring and change the trucks wiring to agree with your trailer wiring.
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  #4  
Old 03-28-2020, 08:53 AM
REW REW is offline
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Copy Snowkings comments.

Bottom line - test and find out which contact in the trailer does what function.

Then, check your trucks wiring and change the trucks wiring to agree with your trailer wiring.

https://www.ajtnt.com/Info/7-Way-Diagram

Go to the link and open the page. Then, print a couple copies of the link to give you the reference diagram for your vehicles required wiring and your trailers required wiring.

Do, what is needed to make both agree with the wiring diagram.

Best wishes.

If you don't have a voltmeter, purchase one.
If you don't know how to use the voltmeter, then learn how to use one.

Take care
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Old 03-28-2020, 09:00 AM
REW REW is offline
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A tester:
https://www.amazon.com/IPA-Tools-786.../dp/B000HI48KI


https://www.google.com/search?q=test...Akz4c8P6IXkZvM
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  #6  
Old 03-28-2020, 11:09 AM
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RMBin303 RMBin303 is offline
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Is the trailer hitch and wiring on the BMW OEM or aftermarket?

I've read a few places that there is some sort of wiring harness that is required for the German manufactures.
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Old 03-28-2020, 11:39 AM
Huntindave Huntindave is offline
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Yes, don't assume that the trailer was wired correctly when it left the factory. It is quite possible somebody assembled that particular harness incorrectly.

I would check and correct if needed both the trailer and the tow vehicle and make sure they conform to what is now the "standard" wiring pattern for a 7 PIN plug. The wire color should conform to the terminal number. Don't get hung up on the actual position shown as it will depend on whether you are viewing the plug or the receptacle. One will be clockwise and the other will be counterclockwise when vied from the terminal end where the wires attach.
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Last edited by Huntindave; 03-28-2020 at 11:54 AM.
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