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I HAVE AN H&H TRAILER THAT THE BRAKE ASSIST WIRING WAS REMOVED AND I HAVE A 1984 CHEVY SUBURBAN THAT WHEN I WIRED IT FOR THIS TRAILER I LOST TAILLIGHTS AND KEEP BLOWING THE FUSE WHEN THE HEADLIGHTS ARE TURNED ON

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Travel Trailer wiring, lights and electronic brake control

Try looking at this link. If it makes sense, great. If not, we'll try to get the actual 74377 manual.

http://www.etrailer.com/faq_wiring.aspx

Posted on Jun 22, 2008

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dteck
  • 2 Answers

SOURCE: 1990 GMC Suburban Wiring

check for adiquate ground at trailer plug in an make sure the problems not on the trailer it self does it go away when trailer is unpluged also try ground in the taillight buckets grounds an corroded conecctor are usaly at falt

Posted on Oct 13, 2008

  • 114 Answers

SOURCE: 04 DODGE RAM TRAILER BRAKE WIRING

If you have a seven pin connector in your tow package, you should be wired for electric brakes. just need the brake box.usually in your owners manual it will show you where to plug the box into. the best thing to do is contact your local chrysler dealer and ask them.if you give them your VIN number they should be able to tell you for sure.

Posted on Dec 29, 2008

  • 188 Answers

SOURCE: 98 jeep tj, dash light/taillights/licence plate light don't work

disconnect head lights, and replace fuse. Then turn the light back on to see if it blow a fuse again. if not, plug on light in at a time. You might have a bad headlight???? then unplug that one if nothing happens. Then plug the other one in. It could also be a bad taillight bulb. I have had bad tail light bulbs. Do all of them, one at a time.

Posted on Feb 14, 2009

  • 1348 Answers

SOURCE: taillights and license plate lights not working

there is a short somewhere.put a test light in place of the fuse.
the light will glow bright.when the short is removed,the light will go dim

Posted on Jul 18, 2009

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1 Answer

2004 Chevy Express 1500 keeps blowing trailer light fuse


If you're only blowing the fuse while the trailer is plugged in, the problem is in the trailer/wiring. This takes into account that the truck has a factory installed 7 way receptacle. If that's not the case, the problem can be in the incorrectly wired truck and the trailer is ok.

On the truck, looking into the 7 way receptacle should be as follows.
Top left=Tail Lights
Top right=12v steady source/charge line
Left middle=Left turn/brake
Right middle=Right turn/brake
Left bottom=ground
Right bottom=brake controller output
Center=reverse lights if your trailer is equipped.

Your trailer plug should mirror this.

This is the standard.

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1 Answer

Brake light fuse keeps blowing in my 1997 Suburban only when towing trailers.


If the fuse blows on different trailers then it's all down to the vehicle. You either have incorrect wiring on the vehicle, a short OR the fuse is not of a high enough value to cope with the additional brake lights? You could try removing all the trailer bulbs EXCEPT the brake lights - e.g. if it's trying to power up the indicators too? That would stop the fuse blowing...... OR remove the brake bulbs from the vehicle & see if it operates the trailer without blowing...... Check the total wattage of ALL the brake lamps & see if the fuse is actually of a high enough rating? Be aware though that increasing the value of the fuse could cause damage elsewhere! As a rough guide a 25 watt bulb will pull around 2 amps at 12 volts - so 4 bulbs may pull up to 8 amps & clearly blow a 5 amp fuse! If in doubt take it to an auto electrician...... The wiring needs to be correctly protected!

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Trailer light issues


Hi Donald,
It sounds like a wiring issue. Double the wiring to your connector on the vehicle. Also check the wiring on the trailer connector. I have seen many trailer that are wired to ground through the ******, this of course will cause an intermittent ground and flickering lights. you only need four (4) wires... One for a ground, One for running lights, and Two wires for brake and turn - one wire for the left and one wire for the right. You can also find the proper pin wiring for vehicle and trailer on the internet. Cheers. I hope this helps. John

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Truck won't shut off until I unplug my tent trailer? Just pick up new trailer and had a 7 pin connector added to my truck along with a brake controller


It sounds like someone messed up to me! Apparently, the brake controller got wired into an ignition circuit that it should not have gotten wired to. When accessories are added to a vehicle, it is extremely important that the vehicle wiring diagrams are used so that you know EXACTLY what you are tying into. Some of the Chevy trucks that are sold with trailer towing packages already have the wiring for brake controllers under the dash. This makes installation easy and is already tied into the correct things.

Also see my comments on related subjects HERE

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1 Answer

I just installed a brake controller in a 2007 chevy suburban and when i touch the brakes the trailer brakes lock up


you have to adjust the trailer brakes to brake softer when the suburban brakes are applied. depending on the model of trailer brake controller you have the settings should be fairly simple. you might want to try going down by 45% for starters and if it is still too hard go in 5% increments

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I'm owner of a 1995 GMC Yukon a trailer wiring was installed, resulting from this I've begone to experience problems with my rear end break lights working when applying breaks, rear end lights work when...


These diagrams will help assist you and I have always had success using these diagrams to properly wire trailer connectors, and all of the connections should be soldered well and also use heat shrink tubing. Let me know if you require any further assistance.


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Jul 16, 2010 | 1995 GMC Suburban

2 Answers

Wiring 7 pin trailer plug for 1998 C1500 pickup truck Z71


Here is some information that I find useful when wiring trailer connectors, and the brake controller should be wired into the vehicles wiring according to the instructions that came with the brake controller and that identifies each wire from the brake controller.

Be sure that you solder all connections well for the best operation, and you should use 10 or 12 ga. wire for the Pos. (+) connection, and the ground or Neg. (-) connection, and you should run both wires all the way out to the battery, and about one foot from the battery on the Pos. (+) wire to the battery, make sure that you use a 20 or 30 amp Circuit Breaker and Do Not Use A Fuse.

The rest of these diagrams should help you to get your trailer properly wired up.





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1 Answer

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what about the sockets of the lights are they rusted in the contact spot and touching the 2 positive connections

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i have a 1996 chevy 1500 bought a brake controler but what wire do i put the blue wire to ther are 4 white wires from brake peddle that go on when peddle is pressed on.

May 27, 2008 | 1996 Chevrolet K1500

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