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Discussion Starter #1
I have a 2001 Ram Off-Road. Its got the tow package and all that stuff from the Factory, and had a 7 pin electrical connector mounted near the Reese style hitch. I am having a problem with the wiring, or fuses, or something, because when i plug my trailer s into the truck the lights on the trailer all work EXCEPT the running lights.
Any Ideas where I should look? The Connector on the truck looks very clean and in great shape, no corrosion and still greased from the factory.

I hooked it up to 3 different trailers and the same thing happens with all the trailers even with a trailer with a 4 pin connector.
What should i look for? Thanks guys!
 

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its prob a loose pin connector in the plug get you a cheap tester and chreck all the pins with the power on too find the dead one
 

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Discussion Starter #5
Not real sure if I was testing right......
I just took and put the meter on DC 0-20, and touched the Black pin to the Ground connector, and then touched the Red pin to the other connectors as I put different lights on.

When I did this, I found that the Turn signals make a noticable voltage change (like 7-9V) as they flash, but nothing changes when I put just the parking lights on (to make the marker lights on trailer light up) No Voltage change shown on any of the pins!
What the heck does that lead me into?
I looked at the underhood fuses and the ones I looked at were not popped. I don't know how to check a relay, and there were a bunch of relays in that fuse box. Could it be one of them?
What else should I be doing?
Thanks again, sorry for the lack of electrical knowledge. :D:
 

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Here is more detail on the wiring swiped from annother site.... It sounds like you need to desassemble the truck plug and make sure the wires are still connected to the pins, then check out the fuse and relays. Check the circuits by touching the black lead from your meter to any bare metal and then touch the red lead to the pin or wire you are checking for current. DC 0-20 is fine as you will likely have a max voltage of 14 +/-. Read the part about cavity 4, it should always be on. Check its fuse.

TRAILER WIRING IDENTIFICATION

The trailer tow wiring 7-terminal connector (located on the receiver hitch), is configured with the following circuits:


CAV CIRCUIT FUNCTION
1 Z13 12BK GROUND
2 B40 12LB TRAILER TOW ELECTRIC BRAKE OUTPUT
3 L76 12BK/OR TRAILER TOW RELAY OUTPUT
4 A6 12RD/TN FUSED B(+)
5 L63 16DG/RD LEFT REAR TURN SIGNAL
TRAILER TOW
6 L62 16BR/PK RIGHT REAR TURN SIGNAL
CONNECTOR
7 L1 16VT/BK BACK-UP LAMP SWITCH OUTPUT

Some of the circuits of the 7-terminal connector may be somewhat difficult to identify. The following explains those circuits that may be somewhat confusing.

Cavity-2 Trailer Tow Electrical Brake Output

This circuit provides a connection between the trailer tow 7-terminal connector and an electric trailer brake system. An electric trailer brake kit was introduced at the beginning of the 1996 model year. The kit includes an electric trailer brake jumper with unterminated leads, heavy duty flasher, a 7-terminal to 4-terminal adapter, and an instruction card. The instruction card identifies that the trailer brake circuit mating connector is located in the instrument panel near the steering column. This kit is utilized throughout Chrysler Corporation on several different vehicle applications and on the Dodge Ram truck, the mating connector can be located behind the fuse block near the dash panel, not near the steering column as stated by the instruction card.

Cavity-3 Trailer Tow Relay

The trailer tow relay circuit provides a 30 amp circuit (40 amp for 1996 and 1997) to feed the trailer's taillpark lamp circuit. This circuit is connected to fuse 7 in the Power Distribution Center (PDC). The relay is also located inside the PDC. The relay is energized anytime the park lamp switch is turned ON. The park lamp switch provides the necessary current to operate the trailer tow relay coil.

WARNING: IT IS IMPERATIVE THAT THE TRAILER TOW RELAY BE UTILIZED WHEN OPERATING THE TAILIPARK LAMPS ON THE TRAILER. THE CURRENT CARRYING CAPACITY OF THE HEADLAMP SWITCH IS LIMITED TO THE LAMPS UTILIZED BY THE VEHICLE ONLY.

Cavity-4 Fused B+

This circuit provides a 30 amp (40 amp for 1996 and 1997) circuit for operating electrical circuits on the trailer. This circuit is connected to fuse 7 in the PDC. This circuit does not contain any isolation device between the 7-terminal connector and the fuse. Current will not be interrupted to this circuit with the ignition switch in the OFF position.

Cavity-1, Cavity-5, Cavity-6, and Cavity-7 are self explanatory.

MOPAR TRAILER TOW PACKAGE

If the Ram Truck does not have the trailer tow package installed at the factory, the truck wiring can be converted so that trailer wiring can be connected to the truck's wiring system. The following trailer tow wiring harnesses are available from Mopar.

82401264 4-Terminal Trailer Tow Wiring Package
82400961 7-Terminal Trailer Tow Wiring Package (1994 All Models and 1994 - 1997 Cab Chassis)
82401265 7-Terminal Trailer Tow Wiring Package (1 995 - 1997 Models except Cab Chassis)
NOTE: - THE 4-TERMINAL TRAILER TOW WIRING PACKAGE SHOULD NOT BE USED WITH TRAILERS THAT HAVE ADDITIONAL RUNNING LIGHTS OTHER THAN THE REAR TAIL/PARK LAMPS.

For additional information regarding Mopars trailer tow packages, refer to the 1996 Mopar Accessories P.A.D. Application Guide & Price List.

TRAILER TOW PACKAGE COMPONENTS AND ACCESSORIES

The following components and accessories can be ordered through Mopar to aid in trailer wiring connections.

82400554 7-terminal trailer wiring connector
82401217 7-terminal to 6-terminal adapter
56019823 7-terminal to 4-terminal adapter
04608650 Trailer Tow Relay (1994 -1996)
04638094 Tra i ler Tow Relay (1997)
02932877 Heavy Duty Flasher
Notes:

Policy: Information Only

From a 1995 issue of the Star Center News:

1994/95 DODGE RAM (BR) TRUCK TRAILER TOWING REQUIREMENTS

Both the factory installed trailer tow harness and the Mopar, Parts trailer tow harness do not require the trailer tow harness overlay kit. The necessary relay is in the PDC when the harness is installed at the factory, and the Mopar Parts trailer tow harness has the relay built into the harness. The overlay kit is erroneously listed in the 1994 New Dodge Ram Cummins Turbo Diesel Owners Manual(Publication No. 81-326- 9422), the 1995 Dodge Ram Pickup Truck Owners Manual (Publication No. 81-326- 9522) and also on an addendum card (81-016-9422).
 

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Discussion Starter #7
Still fighting with this. I checked all fuses and found them all to be OK. I'll probabely have to take it somewhere to get figured out! :(:
 

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Discussion Starter #8
Shop found it, it was a extra fuse the dealership installed when they put our electric brake controller box on. That fuse was hiden and blown. So damn simple, but it still took them 2 hrs to track it down.
 

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i was gonna say i have the trailer tow package on my ram. i was installing lights on my trailer and i got so angy. i kicked the lights and broke them and went out and got a new set. they didnt work either....i had turn and flashers but no running. a simple test with the meter showed no power from the running light fuse. anyhow......i opened the fuse box and the trailer running lights fuse was blown. man i wasted a good set of trailer lights and an extra 40 bucks
 

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i had the same thing, factory tow package, and no running lights on my trailer. but it took me like 2 weeks to track down that fuse, hidden under the hood....arrgghhhh, why couldn't i see this last summer
 

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Reading the post I am having the same damn issue. All works except running lights. Purchased the wiring kit from uhaul. Says brown wire goes to running light on the truck with tap. Test light says all good. Trailer does not light. Checked fuses which are good. The hidden fuse I keep seeing in the post. Where is it?
 

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One of my buddies have the same issue, except he DID change out his relay. Something else that is strange, when the running lights are off. There are lots of running lights' info on blmall.com, you cound get the picture clear.:rolleyes:
 
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