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trailer wiring #809281 05/02/07 02:00 PM
Joined: Mar 2007
Posts: 7
L
leeeisenbraun Offline OP
Need a Spot
im going to a concert in july and im bringing a camper. my jeep originally came with a 7 pin trailer hook up but someone changed it to the 4 pin. i hooked it up to my camper to make sure everything is working but i got nothing. there are no brake lights turn signals or any lights at all. i have already checked the lights on the trailer with my brothers truck and they all work. so it has something to do with my jeep. could it be a fuse or a ground? could anyone help

From the Off-Road World
Re: trailer wiring [Re: leeeisenbraun] #809282 05/02/07 02:21 PM
Joined: Jan 2003
Posts: 156
CoronaJeeper Offline
Wheeler
These problems can be maddening. First, you eliminated the camper as a source of problems- that's half the battle. Sounds like you are losing ground, since no lights work. Are you familiar with a volt meter? If so, use it to check output of each pin on your Jeep connector one at a time. You will need someone to help with this-like stepping on the brake pedal while you check. If the wiring pigtail on your Jeep is one of those plug-in no splice kits, crawl under and un-plug the connections carefully to inspect for corrosion on the pins, since these usually get pretty nasty, and eventually start losing connection. (grease applied to them when they are new helps prevent this). It is possible that your connector uses a seperate ground wire that attaches to a metal part of the Jeep under the back somewhere. It could be broken, or corroded. Sometimes the trailer will get ground thru the hitch ball, but it is best to make sure the ground wire is intact on the tow vehicle for best performance.
Sorry for long post <img src="/forums/images/graemlins/scared.gif" alt="" /> Hope this helps,
Corona


'98 TJ, 4 cyl., auto
31" AT KO's on rockcrawlers,
custom bumpers, Hellas
2" Teraflex lift, no top,
no doors, no problem.
Re: trailer wiring [Re: CoronaJeeper] #809283 05/02/07 03:28 PM
Joined: Mar 2007
Posts: 7
L
leeeisenbraun Offline OP
Need a Spot
thanks i will try the voltometer and get back to you <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />

Re: trailer wiring [Re: leeeisenbraun] #809284 05/02/07 04:41 PM
Joined: Oct 2003
Posts: 7,768
BigJim Offline
Web Wheeler
Yeah! I have even used a JUMPER CABLE to clamp on both frames to assure a ground! Many times the hitch is a bit rusty and will not ground properly until a few blocks of trailing is accomplished..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />


professional bovine relocation specialist
Re: trailer wiring [Re: CoronaJeeper] #809285 05/03/07 04:55 PM
Joined: Mar 2007
Posts: 7
L
leeeisenbraun Offline OP
Need a Spot
i took a multimeter and found out i have ground and one other wire but the other two didnt read anything. so i have ground and tail, license, sidemarker lights but no turn signals or stop lights. not really sure what to do now get back to me

Re: trailer wiring [Re: leeeisenbraun] #809286 05/03/07 07:03 PM
Joined: Sep 2005
Posts: 1,087
BobRowe Offline
Body Damage is Cool
Let me summarize, to see if I understand the situation correctly. I apologize for the length of this post, but I don't know how to correctly explain the situation briefly.

(1) You have hooked the trailer up to another tow vehicle, and all of the lights on the trailer work properly in that situation.

(2) You have used an ohmmeter to test what you believe is the ground pin on the plug on your tow vehicle, and it has what you believe to be a good ground.

(3) You have turned on the lights on the tow vehicle, and are getting a good 12-volt reading on the pin of the plug on the tow vehicle that supplies power to the trailer's tail lights, license plate light, and side marker lights.

(4) You have not been able to get a reading on the other two pins for left and right turn signal lights, when those lights are turned on in the tow vehicle.

Here is what I suspect is happening:

If you're using a 4-pin connector, there is NO GROUND WIRE hooked up through that connector. The four pins supply the following power:

(a) Power to taillights, license light, and side lights.

(b) Power to left turn signal light.

(c) Power to right turn signal light.

(d) Power to back up (reverse) lights.

Naturally, during emergency flasher operation, power is intermittently applied to both of the turn signal pins simultaneously. Similarly, during braking operation, power is constantly applied to both of the turn signal pins simultaneously as long as the brake is depressed. A 4-pin connector, unlike a 7-pin connector, DOES NOT provide for connection of a ground wire. The system depends on metal-to-metal contact between the two vehicles, usually through the tow bar or an external grounding strap.

A 7-pin connector, in addition to the above 4-wires connected in a 4-pin connector, provides for the following:

(e) Ground connection.

(f) Power to electric trailer brakes.

(g) Power to recharge an emergency break-away battery on the trailer.

So how are you getting a ground reading on one of the pins of your connector? I believe that you are not reading a true ground, but are rather reading a low-resistance path to ground through the light bulbs or other appliances in your tow vehicle.

In order to insure that you are corectly measuring the voltage for the turn signals and the backup lights, make sure that the negative (black) lead from your voltmeter is connected to the FRAME of the tow vehicle. Then connect the positive (red) lead of the voltmeter to each of the pins, in turn, on the towing connector on your tow vehicle.

Here's a tip: If you use an analog voltmeter (with a display needle), it will react fast enough for you to see the fluctuating voltage of turn signals or emergency flashers. However, if you are using as digital voltmeter (with a numerical display), the meter circuitry may not react fast enough for you to get a proper voltage reading. If that is the case, get a friend to step on the brakes while you test the two turn signal pins.


1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.
Re: trailer wiring [Re: BobRowe] #809287 05/03/07 07:16 PM
Joined: Oct 2003
Posts: 7,768
BigJim Offline
Web Wheeler
Howdy Bob MY 4 pin connectors all have a ground wire! And a clearence wire and a left and a right turn.. NONE of my 4 pins have a backup light in them..
I think maybe he needs to turn his KEY on while testing the left and right turns and make sure the tow vehicle is blinking while testing.
Also my newer pickups all have a seperate FUSE for trailers that can blow while the tow vehicle lights still work..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />


professional bovine relocation specialist
Re: trailer wiring [Re: BigJim] #809288 05/04/07 01:10 AM
Joined: Sep 2005
Posts: 1,087
BobRowe Offline
Body Damage is Cool
Quote
Howdy Bob MY 4 pin connectors all have a ground wire! And a clearence wire and a left and a right turn.. NONE of my 4 pins have a backup light in them..


Strange. Both my 1991 Dodge pickup and my 2007 chevy trailblazer have 7-pin connectors on them. When I insert a "7-pin-to-4-pin" adapter in them, the 4 pins that I described are the ones carried through to the 4 pin connector, and the back-up lights on other folks's trailers (that had 4-pin connectors) that I have towed all had the backup lights work.

My own trailer has a 7-pin connector, so I don't have to worry about it.

On the other hand, I have wired my CJ7 (with a diode set and a 4-pin connector) so that it's rear lights will work when I'm flat towing it. I plut a 7-pin to 4-pin adapter in the trailblazer factory 7-pin connector, and the back up lights on the towed Jeep work.

Point taken about making sure the key is on and making sure that the lights on the tow vehicle are working while checking the trailer lights.

That being said, both of those turn signal wires are used for hazard flashers, and they're both used for brake lights, and the key does not have to be on for either of those conditions.


1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.
Re: trailer wiring [Re: BobRowe] #809289 05/07/07 08:00 PM
Joined: Jan 2003
Posts: 156
CoronaJeeper Offline
Wheeler
You have back-up lights on a trailer? Sure? I've never heard of it. I'm pretty sure there is a ground wire on a 4-pin connector. It's the one that's exposed, while the other 3 are kinda protected by the design of the plug.
Corona


'98 TJ, 4 cyl., auto
31" AT KO's on rockcrawlers,
custom bumpers, Hellas
2" Teraflex lift, no top,
no doors, no problem.
Re: trailer wiring [Re: CoronaJeeper] #809290 05/08/07 02:07 AM
Joined: Oct 2003
Posts: 534
R
RockJock Offline
Rock Warrior
A 4 pin wire conn. is wired or should be wired as follows:

Green - Right side turn/brake
Yellow - Left side turn/brake
White - Ground
Brown - Tail, Liscense, Side marker.

I would trace out your wires and check the connections.

Cheers,
Kevin <img src="/forums/images/graemlins/kewl.gif" alt="" />

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