Go Back   Ford Truck Enthusiasts Forums > Misc. > Electrical Systems/Wiring
Sign in using an external account
Register Forgot Password?





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 11-12-2001, 04:48 PM
kioolt kioolt is offline
Senior User
Garage is empty, add now
 
Join Date: Aug 1999
Location: Bel Air USA
Posts: 486
kioolt is starting off with a positive reputation.
Turn signal, trailer wiring problem

__________________
95 Taurus GL
94 Mark VIII
93 F150XLT
Reply With Quote
  #2 (permalink)  
Old 11-13-2001, 03:57 PM
Shepard Shepard is offline
Elder User
Garage is empty, add now
 
Join Date: Nov 2001
Location: S.W. Oregon
Posts: 618
Shepard is starting off with a positive reputation.
Turn signal, trailer wiring problem

I am not very knowledgeable regarding truck electrical systems so I will describe what is happening and maybe someone can give me some clues as to where to start. When I have my work/utility trailer hooked up and plugged into the little vertical 4 pin connector on my truck bumper, all brake lights and turn signals work fine until I turn on the truck headlights. Then the left turn signal wont blink. All other lights work ok its just the left signal which stops. If I have the left signal on and then turn on the headlight switch, the left turn indicator on the dash dims and stops flashing.

I have a new F-350 so Im thinking it is something like a short on the trailer wiring rather than on the new truck. Puzzle is that everything always worked fine, as recently as last week, when the trailer was hooked up my 89 F-150.

Thanks

__________________
.
2001 F-350 CC LB 4X4 3.73LS V-10 Auto - Also 1989 F150 SC LB 4X2 LS Inline 6 manual 5sp
Reply With Quote
  #3 (permalink)  
Old 11-13-2001, 07:26 PM
sparky's Avatar
sparky sparky is offline
Posting Guru
Garage is empty, add now
 
Join Date: Jun 1999
Location: Comox Valley, Canada
Posts: 2,373
sparky is starting off with a positive reputation.
Turn signal, trailer wiring problem

Symptoms of a bad/corroded ground.

Ssparky
__________________
Sparky

Junk is something you've kept for years
and throw away three weeks before you need it.
Reply With Quote
  #4 (permalink)  
Old 11-13-2001, 07:30 PM
sparky's Avatar
sparky sparky is offline
Posting Guru
Garage is empty, add now
 
Join Date: Jun 1999
Location: Comox Valley, Canada
Posts: 2,373
sparky is starting off with a positive reputation.
Turn signal, trailer wiring problem

Oops too quick with the post button. Bad ground most likely on the left hand side of the trailer. Unless it does this with the trailer disconnected, then it could be at the front or rear of the truck. It probably does this with just the parking lights on and not the headlights. So check the light sockets and ground wires for the parking lights.

Sparky
__________________
Sparky

Junk is something you've kept for years
and throw away three weeks before you need it.
Reply With Quote
  #5 (permalink)  
Old 11-13-2001, 10:31 PM
Shepard Shepard is offline
Elder User
Garage is empty, add now
 
Join Date: Nov 2001
Location: S.W. Oregon
Posts: 618
Shepard is starting off with a positive reputation.
Turn signal, trailer wiring problem

[updated:LAST EDITED ON 13-Nov-01 AT 11:35 PM (EST)]Thanks sparky - It does not do it with the trailer disconnected. It does do it however with parking, low beams or high beams on. It only works properly with the truck lights off. Truck lights off = all trailer lights work as they should. Truck lights on in any setting causes the problem only with the left signal. The trailer has only one ground wire which seems to be ok. I will take the screw out tomorrow and reinsert it to see if that fixes it. Just to be absolutely clear, if the trailer plug is disconnected, truck signal works fine. Am I looking at it too simplistically to think that given this fact, the problem has to be in the trailer or in the plug on the truck bumper?
__________________
.
2001 F-350 CC LB 4X4 3.73LS V-10 Auto - Also 1989 F150 SC LB 4X2 LS Inline 6 manual 5sp
Reply With Quote
  #6 (permalink)  
Old 11-14-2001, 12:18 AM
sparky's Avatar
sparky sparky is offline
Posting Guru
Garage is empty, add now
 
Join Date: Jun 1999
Location: Comox Valley, Canada
Posts: 2,373
sparky is starting off with a positive reputation.
Turn signal, trailer wiring problem

OK on your left trailer light assembly there is most likely a ground problem.
If it is a typical light setup, there is one 1157 bulb, which has 2 filaments. One filament is for the running lights and the other is for the brakes and turn signals. There is a tab that is inside the light socket and it is the common ground for the 2 circuits, parking and brakes/turn. This ground is mostly likely the problem it could be corroded at the socket, or where it mounts to the trailer frame. Or it could be the outside brass colored base of the bulb that is corroded.
It sounds like you are suffering from what is called a "floating" ground. The normal ground for the light is missing so the running lights are getting their ground thru the turn signal circuit causing them to stop blinking and the turn signal indicator to light up.
Hope this helps out.

Sparky
ps
The trailer lights can be grounded 2 ways. One is the tab in the light asembly is grounded to the trailer frame near the light assembly and the trailer frame is grounded to the truck frame thru the 4 pronged trailer connector. The other way is the light grounds, lh and rh, are connected together and then connected thru the 4 pronged trailer connector to the truck frame. The second is my preferred method, but the first works just as good.
Anyway, check out the grounds and let us know how you make out.
__________________
Sparky

Junk is something you've kept for years
and throw away three weeks before you need it.
Reply With Quote
  #7 (permalink)  
Old 07-01-2010, 09:52 AM
dustinnice's Avatar
dustinnice dustinnice is offline
New User
Garage is empty, add now
 
Join Date: Aug 2009
Posts: 3
dustinnice is starting off with a positive reputation.
no!! this thread needs an answer! I have a 99 f150 xlt with this same problem but neither of the turn signals or hazard lights work on my trailer when the parking lights or headlights are on. the lights on the trailer are brand new, grounded at the tongue. somebody help (:
Reply With Quote
  #8 (permalink)  
Old 07-01-2010, 03:53 PM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
1989 Ford F-250
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 31,688
Franklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud of
Quote:
Originally Posted by dustinnice View Post
no!! this thread needs an answer! I have a 99 f150 xlt with this same problem but neither of the turn signals or hazard lights work on my trailer when the parking lights or headlights are on. the lights on the trailer are brand new, grounded at the tongue. somebody help (:
This thread was answered with the solution. If you have the same problem(lights will not work with the parking lights on, they will otherwise), take a long scrap piece of wire and hook it to the battery negative terminal, run it in the yard back to the trailer, and hook it directly to the ground for the light at the light itself, and see if that cures it on that side.

If it doesn't, then take the light apart and with the parking lights on, and the turnsignal to the light you are working on activated, jamb your temporary ground wire beside the light so it touches the brass part of the bulb. That should fix it. If it does, then you have a connection problem between the brass part of the bulb(bulb ground) to the ground wire of the light fixture. If running the temp ground wire directly to the ground wire of the fixture fixes it(the first test) then you know you have a ground problem between the fixture ground wire and the frame of the trailer, and or the trailer frame and the truck frame.

Don't rely on the ball to give you a ground, all trailer wiring plugs have a spot for a ground to pass through the plug itself.
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
  #9 (permalink)  
Old 07-03-2010, 05:11 PM
BPofMD's Avatar
BPofMD BPofMD is offline
Posting Legend
2005 Ford F-250
 
Join Date: Jul 2005
Location: Millersville, MD
Posts: 30,938
BPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputationBPofMD has a superb reputation
+1 ---- NEVER, never - rely on the hitch ball to give you a reliable ground!
__________________
BPofMD - Bud - USN-Actively Retired
2005 F250 PSD 4X4 LB Crew-cab Arizona Beige / Blue Spring / Gauges / Coolant Filter / SG-II / Peragon Bed Cover/ P/S Filter/ MAG-HYTEC differential cover/

2007 Arctic Fox 30' Fifth Wheel
2012 VW Passat SE TDI - SG-II (An ALL-DIESEL family)
Reply With Quote
  #10 (permalink)  
Old 07-10-2011, 10:01 PM
Lorijohn Lorijohn is offline
New User
Garage is empty, add now
 
Join Date: Feb 2011
Posts: 9
Lorijohn is starting off with a positive reputation.
97 F150
I seem to have a similar problem, but it is the same even if trailer is not attached. I've checked the 4 pin plug with volt meter and also checked the pins on the wiring harness plug in the fender well. The both operate the same strange way. Checking the voltage at each pin with the ground on the 4 pin plug I get the following voltages:

..........Brown yellow green
all off.....12.......0.......12
brake.....12.......0.........0
lights.......0.......0........12
LB..........12....0/.15.....12
RB..........12......0.......12/0
light&brake..0....0.........0

Is this a ground problem too or a wiring failure somewhere else. The truck lights themselves work fine. I checked all the trailer fuses, including the one in the small 5 slot box near the firewall. They all look good. I apprecite any suggestions.

John
Reply With Quote
  #11 (permalink)  
Old 07-11-2011, 10:21 AM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
1989 Ford F-250
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 31,688
Franklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud of
Quote:
Originally Posted by Lorijohn View Post
97 F150
I seem to have a similar problem, but it is the same even if trailer is not attached. I've checked the 4 pin plug with volt meter and also checked the pins on the wiring harness plug in the fender well. The both operate the same strange way. Checking the voltage at each pin with the ground on the 4 pin plug I get the following voltages:

..........Brown yellow green
all off.....12.......0.......12
brake.....12.......0.........0
lights.......0.......0........12
LB..........12....0/.15.....12
RB..........12......0.......12/0
light&brake..0....0.........0

Is this a ground problem too or a wiring failure somewhere else. The truck lights themselves work fine. I checked all the trailer fuses, including the one in the small 5 slot box near the firewall. They all look good. I apprecite any suggestions.

John
Start over. What's your problem? You rear truck lights work fine, but the trailer lights do not? What do the trailer lights do when plugged in and you go through the various stop turn motions?
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
  #12 (permalink)  
Old 07-11-2011, 09:23 PM
Lorijohn Lorijohn is offline
New User
Garage is empty, add now
 
Join Date: Feb 2011
Posts: 9
Lorijohn is starting off with a positive reputation.
When I connect the trailer (no truck lights on), the lights come on, right one bright and left one dim.
When I turn on lights, right one stays bright left one goes off.
When I brake, both lights are dim.
When I turn on left blinker, right is brihgt and left is dim.
When I turn oln right blinker, right light blinks and left light is dim.
With lights and brakes together, all lights off.
With lights on and left blinker, right light bright and left light off.
With lights on and right blinker, right light blinks and left light off.
These match up with voltages I read off he pins (in the last post) with the trailer disconnected, so it appears to me the problem is with the truck wiring.

Thanks for asking.
Reply With Quote
  #13 (permalink)  
Old 07-11-2011, 11:13 PM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
1989 Ford F-250
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 31,688
Franklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud of
The first thing I would do is take a scrap piece of wire and find a good ground on the truck and hook one end to that, and then find a good ground on the trailer and hook the other to that. Just lay it on the ground, we are just experimenting right now.
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
  #14 (permalink)  
Old 07-11-2011, 11:23 PM
Lorijohn Lorijohn is offline
New User
Garage is empty, add now
 
Join Date: Feb 2011
Posts: 9
Lorijohn is starting off with a positive reputation.
Good idea. I Tried this with a set of jumper cables earlier today. Got good tone on a voltmeter continuity check from truck to trailer, but no difference in lights operation.
Reply With Quote
  #15 (permalink)  
Old 07-12-2011, 12:21 AM
Franklin2's Avatar
Franklin2 Franklin2 is offline
Moderator
1989 Ford F-250
 
Join Date: Jan 2001
Location: Staunton VA
Posts: 31,688
Franklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud ofFranklin2 has much to be proud of
Look at the trailer wiring at the rear of the truck. It will be wired one of two ways;

1. Factory wired using the factory tow wiring that is built into the harness or,

2. Wired aftermarket into the trucks rear lighting. This could be a slick "T" connector you can buy at the store and insert in the factory rear wiring, or this could be a spliced in homemade type job, that could be done very nice with soldered connections, or very sloppy with stripped bare twisted wires.

Find out what you have.
__________________
Dave F

1989 F250 XLT Diesel
Reply With Quote
Old 07-12-2011, 12:21 AM
Reply

Go Back   Ford Truck Enthusiasts Forums > Misc. > Electrical Systems/Wiring

Tags
97, bad, blink, econoline, f150, f350, ground, left, problem, rv, signal, signals, signs, trailer, trailerwiringwont, turn, weak, wiring, working

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 08:59 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.5.2 ©2010, Crawlability, Inc.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford is a registered trademark of the Ford Motor Company.



 
vbulletin Admin Backup