The Diesel Truck Site  

Go Back   The Diesel Truck Site > Diesel Truck Forums > Dodge Cummins Forum

Dodge Cummins Forum Dodge Cummins Forum


Reply
 
Thread Tools Display Modes
  #1  
Old 06-30-2016, 09:08 PM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,900
Default Wiring Issue

Hey guys, Last time I plugged my trailer into the four wire plug I saw that the turn signals (both sides) were barely visible and just slightly brighter than the tail lights. I checked voltage at the plug and I am only seeing 10.7 volts to the rear of the truck for brake/turn signal and 11.4 for tail lights. I have a harness that plugs into the factory harness at the back of the truck by the tail lights. I have not had the opportunity to really dig into. Anybody have any idea as to where to check for a problem such as this?
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
  #2  
Old 06-30-2016, 09:56 PM
79jasper's Avatar
79jasper 79jasper is offline
Senior Member
 
Join Date: Feb 2016
Posts: 188
Default

I would check those connections to make sure they're clean and corrosion free.

Sent from my SAMSUNG-SM-G935A using Tapatalk
__________________
1994 F350 7.3 PSD 4X4 ZF5 DUALLY
PHP HYDRA, 6637, 3-4 DP TO STRAIGHT 4 BEHIND THE TIRE, 1.0 EXHAUST HOUSING, DIY D66 TURBO, FUGA E-FUEL, EBPV DELETE. Cooper discoverer AT/3'S.

2010 VW JETTA TDI DSG Kerma tune. Hankook ventus v2 concept 2.

http://badges.fuelly.com/images/sig-us/174421.png
http://badges.fuelly.com/images/sig-us/420711.png
Reply With Quote
  #3  
Old 07-01-2016, 08:02 AM
anoldbiker's Avatar
anoldbiker anoldbiker is offline
Senior Member
 
Join Date: Feb 2012
Location: Just South of the Mason/Dixon Line
Posts: 1,147
Default

Quote:
Originally Posted by 79jasper View Post
I would check those connections to make sure they're clean and corrosion free.

Sent from my SAMSUNG-SM-G935A using Tapatalk


Very much agree. I also found corrosion where the trailer ground wire attaches and once cleaned corrected the problem.

(I hate electrical issues)
__________________
Jim

2006 Dodge Ram, 2500, Big Horn, 5.9 Cummins, 4x4, Q/Cab, 48RE, L/B, 3.73, S&B CAI & Snout, ProFlo 5" S/S exhaust, Smarty Touch, Oil ByPass Filter Kit, Transfer Flow 56 gal tank, 110 gallon in-bed tank, XX-Fuel System, Coolant Bypass Kit, Mag-Hytec front & rear, 285 x 70 x 17

We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution.
~ Abraham Lincoln
Reply With Quote
  #4  
Old 07-01-2016, 08:33 AM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,900
Default

When I have had a few minutes to dig into the problem I found that by the firewall I was only seeing 11 or so volts. I haven't had the chance to really dig into it, but I am also going to check the RV plug I put in the side of the box.
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
  #5  
Old 07-01-2016, 01:40 PM
79jasper's Avatar
79jasper 79jasper is offline
Senior Member
 
Join Date: Feb 2016
Posts: 188
Default

Sounds up stream then. Does it have a "factory trailer wiring package?"
If so, start checking the relays for such, they could be good enough to "work," But not allow the correct voltage through.

Sent from my SAMSUNG-SM-G935A using Tapatalk
__________________
1994 F350 7.3 PSD 4X4 ZF5 DUALLY
PHP HYDRA, 6637, 3-4 DP TO STRAIGHT 4 BEHIND THE TIRE, 1.0 EXHAUST HOUSING, DIY D66 TURBO, FUGA E-FUEL, EBPV DELETE. Cooper discoverer AT/3'S.

2010 VW JETTA TDI DSG Kerma tune. Hankook ventus v2 concept 2.

http://badges.fuelly.com/images/sig-us/174421.png
http://badges.fuelly.com/images/sig-us/420711.png
Reply With Quote
  #6  
Old 07-01-2016, 08:53 PM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,900
Default

I'm not sure where the problem is. The bad thing is I won't be able to look at it until Sunday at the earliest. I do believe it has the factory trailer wiring, but I am using a harness that plugs into the tail light harness.
My son just got here and he said none of his 12 outlets work in his car (2006 VW Jetta) so I am guessing he just has a fuse that needs replaced.
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
  #7  
Old 07-02-2016, 08:25 PM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,900
Default

Well, I guess a I lied... I had the chance to look at it today. Still haven't figured it out. I was looking at things and saw a wire that looked like it should be attached by the PDC. I went so far as to pull the PDC off and look at the underside, I saw where that wire had a bulge in it where at some time in its life it had been probed with a test light. Don't know if it was me or not, but I wound up opening up the harness that heads toward the firewall. Long story short I managed to cut a couple of wires in the harness. I repaired them and searched for where the wire I originally saw was supposed to be attached. Turns out someone replaced that wire, but in the process I found two other wires that had been probed that swelled up from corrosion. I repaired them and still only see 10.7 or so volts at the trailer plug for brake/turn signals. The tail light circuit only sees 11.2 volts so I didn't get very far today. Maybe I can see what else to do tomorrow....
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 03:50 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Skin & Style Created By: Mopar1973Man.Com
Copyright 2012 Diesel Truck Site