Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Cars in General
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 10-23-2017, 10:21 PM   #1
T.C.
AF Newbie
 
Join Date: Jan 2014
Location: Los Angeles, California
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Help with trailer wiring: It works when first wired-up, then stops working

I'm having trouble wiring up the lights on a trailer. I have a 4-way connector, and I believe I've wired it up correctly:

- White to the trailer frame
- Brown to the tail lights
- Yellow to the left turn signal
- Green to the right turn signal

I verified this wiring against the instructions at http://www.therangerstation.com/tech...erLights.shtml. Unfortunately, it doesn't work. The tail lights, left turn signal, and right turn signal work when I first wire them up, but not afterward.

To elaborate: If I turn on the left turn signal on the car, then connect the yellow wire, the left turn signal on the trailer works fine, but only until I turn off the turn signal at the car. After that, the left turn signal on the trailer is unresponsive when I turn the turn signal back on. The same is true of the right turn signal and the tail lights -- they work as expected when I first wire them up, but stop working as soon as I turn off the turn signal or lights.

In all cases, I can disconnect the wires and reconnect them exactly as before, and the lamp in question will work properly again... until I turn it off and try to turn it back on. This tells me I haven't burned out a bulb or a fuse. At all times, the car's tail lights and turn signals work exactly as they are supposed to.

I am baffled by this. Does anyone have an explanation for why my trailer lights might work when first wired-up, but then stop working?

Some details: The car is a 1996 Nissan Pathfinder. The wiring harness on the car is an aftermarket T connector which I installed myself (see https://www.carid.com/curt/3-wire-t-...mpn-55361.html).

-TC
T.C. is offline   Reply With Quote
Old 10-24-2017, 10:00 AM   #2
aleekat
AF Enthusiast
 
Join Date: Dec 2001
Location: clarksville, Tennessee
Posts: 1,389
Thanks: 5
Thanked 146 Times in 142 Posts
Re: Help with trailer wiring: It works when first wired-up, then stops working

I would check the continuity of the ground on the vehicle that you used.
__________________
Post back, that's what makes Forums Work.
aleekat is offline   Reply With Quote
Old 10-27-2017, 02:18 AM   #3
brcidd
AF Enthusiast
 
brcidd's Avatar
 
Join Date: Jul 2005
Location: troy, Ohio
Posts: 2,239
Thanks: 2
Thanked 154 Times in 152 Posts
Re: Help with trailer wiring: It works when first wired-up, then stops working

"Ditto" Bad ground is most common trailer lighting issues.
__________________
Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
brcidd is offline   Reply With Quote
Old 11-01-2017, 02:14 AM   #4
T.C.
AF Newbie
Thread starter
 
Join Date: Jan 2014
Location: Los Angeles, California
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Re: Help with trailer wiring: It works when first wired-up, then stops working

Thank you for the suggestions. However, it looks like I have good continuity to the ground. I used an ohmmeter to measure the resistance between the ground of the flat connector and one of the bolts underneath the plastic threshold for the rear hatch (the only place I could find exposed metal). The meter read 0.9Ω. My meter has a continuity test feature which sounds a tone when there is low resistance. Using that feature, there was a strong, continuous tone. If I should be testing the ground wiring some other way, please let me know.

Is it possible that my T-connector is defective? (https://www.carid.com/curt/3-wire-t-...mpn-55361.html) The T-connector includes a literal black box that was described as 'a circuit-protected converter'. Might that be 'protecting' the circuit by shutting it down, perhaps in the way a ground fault interrupt does?

Last edited by T.C.; 11-01-2017 at 08:33 AM.
T.C. is offline   Reply With Quote
Old 11-03-2017, 11:00 AM   #5
aleekat
AF Enthusiast
 
Join Date: Dec 2001
Location: clarksville, Tennessee
Posts: 1,389
Thanks: 5
Thanked 146 Times in 142 Posts
Re: Help with trailer wiring: It works when first wired-up, then stops working

Website says it has a one year warranty. I would contact the manufacturer. They may have seen this before.
__________________
Post back, that's what makes Forums Work.
aleekat is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Bookmarks
Go Back   Automotive Forums .com Car Chat > Cars in General

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 05:54 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts