Question about 2001 Dodge Ram Maxi

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I am reading only 7 volts dc at the plug connection for my trailer wiring harness - ground or bad flasher would be my first guesses?

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Ground first.

Posted on Jul 16, 2009

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The left tail light on my trailer doesnt work.the stop and turn signal works . is there a fuse for it? i have 2011 gmc sierra 1500


There is a tail lights fuse for the truck, but not for the trailer.
First, check that your left tail light on the truck is working, if not fix the problem (new bulb, bad contact, fuse).
Then the obvious suggestions regarding the trailer are: Check the tail light portion of the bulb to be sure it is not blown. If good (best to put in new one to be sure), then check the wiring from the front of the trailer all of the way to the non working bulb, including every connection and at any place it is secured to the trailer frame. If all is good with the trailer circuit and bulb, then check the truck's trailer connector, including any adapters. If by chance the truck is wired with a flat 4 wire harness the problem may be solved (but usually the blinkers are the problem). Modern trucks require a 5 wire harness which self adapts to the standard 4 wire trailer circuit. Check for dc power (12 volts) from the truck's female connector. One wire will be ground, others will be taillights (turn on headlights), brake lights (have someone press brake pedal), and blinkers (turn on switch and blinkers).

Oct 09, 2016 | 2011 GMC Sierra 1500

2 Answers

Lost all elec.power to trailer plug on jeep


The trailer connection is usually fed off the wiring from the brake and tail lights If those work, my guess is the wire that goes to ground is open. try following the harness back toward the tail and brake lights looking for broken or corroded connections. If you have a meter or 12v test light try connecting the one end to a good ground if using a meter it should be the black or negative lead. Turn on the running lights and one turn signal while probing the plug if you get voltage or the light to light you have an open ground. Locate and repair the connection.

Aug 07, 2014 | 2010 Jeep Liberty

1 Answer

When I tow with my car the left blinker doesn't work on the trailer. There is a 7 pin round plug on the car, with a flat adapter to the flat pin on the trailer. I have had the same problem with at...


Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

Brown Wire- Tail/ marker/ license plate lights

The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

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Sep 18, 2011 | Honda Accord Cars & Trucks

1 Answer

My trailer brakes do not work when the ball and trailer make a connection. But if I just plug in the trailer to the truck I can hear them working. I have checked everything and have had others look at...


Both the ball and the trailer hitch should be grounds so I'm guessing the trailer brakes have a hot wire touching the frame somewhere but not enough to blow a fuse. Before connecting the hitch to the ball, have someone press the trailer brakes and check between the hitch and the ball with a volt meter for 12 volts. If you do then something is wrong with the trailer brakes. I'm just guessing though.

May 17, 2010 | Cars & Trucks

1 Answer

No trailer lights to the plug at all. it has a tow package, could be be a fuse


What type of vehicle? What type of plug (4-way, 6-way, 7-way)? Could be a fuse. Did you put a volt-meter to the plug socket to check for power? Make sure the running lights are turned on, someone's pressing the brakes, and put the flashers on before you use the volt meter. Could be a bad ground on the vehicle or trailer. If it's a 7-way, the plug on the trailer end could be worn and need replacing. The socket on the truck could need replacing. If it's not a fuse and your volt meter gets no reading at the socket, take the socket off and check each wire with the volt meter. If you get readings, it's the socket. If you don't get readings, the problem is before the socket.

Jan 21, 2010 | 2004 Dodge Ram 1500

2 Answers

Trailer brakes


Take a 12 volt test light... the kind that has a spring loaded clip to hold the probe into the wire, and insert it into the wire just before the trailer plug, vehicle side. (Blue I think) If there is a connection, the brake should see it and you should have an indicator light. When you activate the brake the test light should lite up. If not, move up to the brake actuator and test the blue wire. If there is nothing at the actuator, check the black wire. It is power to the controller. If no power there, check fuses again. If it does pick it up at the plug, connect the trailer and test the trailer itself. First ground to the trailer and then to the truck. Most problems are ground wire related. Then move to the axle and test it there. For the brakes to work, and even show on the indicator, there has to be a ground and power to the brakes themselves. There are 2 wires to each brake... a ground and a power. Test across both wires to make sure you have power and ground. You can also hook another trailer to your truck or another truck to your trailer. Lights can work through trailer ball ground. Brakes can't. leave the trailer unhooked from the trailer and hook the wiring up and test the lights. That usually will indicate a good or faulty ground. Also make sure there is a GOOD ground to the truck frame/body. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info. Hope this helps. Mike

Sep 30, 2009 | 2003 Chevrolet Silverado 2500HD

2 Answers

How do you install an electronic trailer brake controller in a 1995 GMC Suburban 1500?


a brake controller has 4 wires on it, Black, white, blue,red.

Black is positive battery 12 volts connect to 30 amp circuit breaker to the battery

White goes to good solid ground

red connects to white wire from the brake switch

blue wire connects to 7 way trailer connector at rear of truck. If the truck has trailer package you will find the blue wire and red wires under brake booster taped to the harness you can connect your blue brake control wire to that blue wire. At the rear of the truck the other end of the blue wire will be taped to a harness under the rear of the truck. you will have to now connect the blue wire to the blue input on your 7 way connector

Sep 16, 2009 | 1995 GMC Suburban

2 Answers

I only have taillights coming out of the trailer plug


so, the trailer has no brake lights, or turn signals, just tail lights? Everything (all lights) on truck work ok? What do you have for trailer wiring hook up 4, 5, 6, or 7 way? There is no fuse, the lights all work off the tow vehicle lights, so if the tow vehicle lights all work properly, it's probably a wiring problem, such as bad grounds, loose connections, etc. Get a volt meter and check voltage at truck plug to see if power is getting that far. If truck plug in is ok, wiring problem is the trailer. Make sure all grounds are tight and rust free, that's a common problem.

May 20, 2009 | 2004 Chevrolet Silverado

1 Answer

I had a trailer hooked up and it shorted out now i can't shift out of park. and the abs light is blinking.


Check your ground wire where you spliced the harness together. Sounds like either you have a "hot" wire, either tail light or blinker, or stop grounded out, or the ground you used is not making a good connection. Try grounding it to where your gas tank braided ground wire is locate.

If this doesnt work, I would suggest unsplicing the harness, tape it back up or heat shrink it and buy the new T-connector with tap off for your 7 way plug. Should run you about $27.

A bad ground will cause your dash to go crazy sometimes, because the indicator lights on the dash are not isolated from the trailer when you splice it directly.

Hope this helps.

Apr 10, 2009 | 1998 Ford F250 SuperCab

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