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I am looking for a lighting schematic for 2005 Isuzu NPR. When hooking up turn signal to trailer plug there are no brake lights to plugin but are brake lights on truck. Note: had to pick another model because no NPR model is listed.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: No left brake light on trailer when hooked up to truck.

I had the same problem but when i tested the left turn signal then tested the brakes both brake lights would then work.

Posted on Mar 04, 2009

GM Elec
  • 1000 Answers

SOURCE: Hooked my 2007 Sprinter camping trailer to the

Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.
REgards,

Posted on Mar 10, 2009

motor1258
  • 6674 Answers

SOURCE: I have a 2008 Dodge Ram that came with the tow

If you have amber signal lights & red brake lights, it's 2 separate circuits. You'll need to buy a small converter that you wire into harness to correct that. Not expensive, try autoparts store or RV/trailer sales, should have them.

Posted on May 08, 2009

co7196
  • 3433 Answers

SOURCE: 2001 Dodge Ram 2500, no running lights on trailer

The truck is protecting itself from the load impose by the trailer.. Chk the plug on the truck for wire gauge size. Turn any electrical loads off on the trailer, any and all. If fuse still blows then the fuse is either underated or the trailer has a dead short. In fact turn trail main power panel of. All lights work you say. So ck the inverter for defect byturning off the inverter on one of the trailers.

Posted on May 28, 2009

Mike258
  • 1498 Answers

SOURCE: No trailer right turn signal or brake light

Hey Boon,

The pinouts for a 7-way plug are as follows:
Seven wire Trailer plugs:

Horse, stock or utility trailers:

White = Ground - 1
Blue = Electric Brakes - 2
Brown = Tail and clearance lights - 3
Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

Recreational Vehicle:
White = Ground - 1
Blue = Electric Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
Red = Left turn/Brake - 5
Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7

In both cases 4 is battery and 7 is reverse, aux or not used.

Double check your wiring using these lists as a reference.

Click here for my post on Trailer wiring

This should get us closer to the answer.

Best regards,
Mike

Posted on Sep 09, 2009

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Most trailers use a single bulb system with the bright filament used for the brake and turn signal, and the dim one for running light. Your truck, however, has a separate bulb for brakes and turn signal, thus requiring the use of a logic box to operate the trailer lights. Get one from parts store, install and all should be good.

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Rear brake lights don't work


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May 23, 2009 | 2005 Chevrolet Silverado 2500HD 2WD

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Have a 2005 chevy colorado, i installed a four way harness exactly how the directions say, but when i connect the trailor only the right and left turn signal and taillights work. No break lights.


On the truck, are the turn signals and the brake lights using the same bulb, if the brake lights are using a different bulb the trailer might not work withe the truck if it only has a 4 wire plug, might have to add brake lights to the trailer and use a 5 wire plug, yes this means rewiring the trailer and adding lights

May 15, 2009 | 2005 Chevrolet Colorado

1 Answer

Wiring problems


Hi Charlie

Six wire plugs:

Horse, stock or utility trailers:
White = Ground - GD
Yellow = Left turn/Brake -LT
Green = Right turn Brake -RT
Brown = Tail and clearance lights - TM
Red or Black (not both) = Battery, aux power - A
Blue = Electric Brakes - S

Ground should be 10ga.
Others 14 ga

Best regards
Mike

Mar 30, 2009 | 2005 Dodge Ram 2500 Truck

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Hooked my 2007 Sprinter camping trailer to the factory lights/brakes hook-up located below bumper of my 2005 Silverado 4x4 extended cab truck. Everything works fine except for the right trailer turn...


Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.
REgards,

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