Question about Chevrolet Silverado

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Trailer tow receptacle right side: turn signal displays correct voltage when signal applied 11.8 volts, but depress brake and only .08 volts displayed. not enough for trailer to pass vehicle inspection. checked/cleaned all grounds, all new fuses, no visible frays in wiring harness,6 way plug near driver kick panel tightly connected. removed old receptacle tested w/o in place still low voltage; totally bewildered as to where problem lies.NEED HELP! PLEASE!

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  • GETWIRED Aug 07, 2008

    this is a 2004 Silverado. wiring for tow package is independant of the trucks lighting. no blown bulbs

  • GETWIRED Aug 07, 2008

    will do thanks ! also remembered one time bulb filament in the right turn signal acted up. tapped on the lens to fix that but maybe caused issue with trailer wiring?

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  • 74 Answers

Check for a blown bulb in the truck. If the bulb is blown, it might be able to properly ground elsewhere

Posted on Aug 06, 2008

  • Johnny Hupf
    Johnny Hupf Aug 07, 2008

    This might sound odd, but try replacing the turn signal relay. Depending on where they tapped into the wiring for the wiring harness on the truck, that could be the possible problem.

  • Johnny Hupf
    Johnny Hupf Aug 07, 2008

    That could possibly have caused the issue, check the wiring on this receptacle and make sure it is clean, no broken fragments, etc.

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Trailer lights come on when van lights are on but turn signals don't work.


The turn signal bulb circuit on the trailer MUST match the towing vehicles turn signals. Example: Tow vehicle turn signal light is the same bulb as the brake light, then the trailer must match. If the tow vehicle has a separate turn signal (amber bulb located away from the brake light) then an adapter is available that will send the correct power to the trailer so everything works correctly. The adapter can be found an auto parts stores, RV supply stores and some truck stops too.

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Instructions for wiring a moving trailer connector


accessconnect_logo.jpg


Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4%20way%20wiring.jpg 4way_vehicle.jpg 4 way tow vehicle side.
4way_trailer.jpg 4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5way_vehicle.jpg 5 way tow vehicle side.
5way_trailer.jpg 5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6way_rectangle_1.jpg 6 way tow vehicle side.
6way_rectangle_2.jpg 6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.


6way_vehicle.jpg 6 way tow vehicle side.
6way_trailer.jpg 6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.


7way_vehicle.jpg 7 way RV flat blade tow vehicle side.
7way_trailer.jpg 7 way RV flat blade trailer side.

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No brake lights but fuse is good. Wiring appears okay.


Isnt there a switch on the brake pedal inside under the dash? There should be power going in and out when depressing the brake pedal. If there is a pressure switch, then check it when the brake pedal is up and then depressed. it should have power on one side up, and both when depressed. One thing to keep in mind that I think it goes through the turn signal switch, so if blinkers work, that tells you the wiring is good to the lights, so concentrate on power getting to and out of the turn signal switch.

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1 Answer

I want to tow the jeep and need to know thecorrect


Review this information and links:
- Trailer 4 Way System Diagram
- Accesories and Instructions

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Instructions
1.) Determine a suitable location for mounting the circuit protected converter in an out of the way spot near the left tail lights in the trunk or on the frame rail, if mounted under the towing vehicle.
2.) Ground the white ground wire by placing the ring terminal under an existing screw attached to a clean metal surface or by drilling another 3/32" hole and using one of the self tapping screws provided.
3.) Disconnect the tow vehicle's negative (-) battery cable.
4.) Cut the in-line fuse holder loop wiring.
5.) Using a ring terminal (3/8 inch for top terminal or 1/2 inch for side terminal), attach an in-line fuse holder (with fuse removed) to the positive (+) terminal of the battery.
6.) Route black 12 gauge wire from the fuse holder to the converter passing under or through the vehicle.
Note: When passing the wire through sheet metal always go through an existing grommet, add a grommet or use silicone rubber to insulate the wire from the hole.
7.) Attach 12 gauge wire to the fuse holder with the yellow **** connector.
8.) Reconnect the tow vehicle (-) negative battery cable. Note: See tow vehicle owners manual for any special battery reconnection and instructions.
9.) Determine if the towing vehicle has a 2 wire or 3 wire system.

2 Wire System
  • Has same bulb for stop and turn signals.
  • Some vehicles have a separate bulb for stoplights but also have a combination bulb for turn and stop. These cars should be wired as 2 wire systems, using the wires going to the common bulbs.
  • Note: Attach the crimp on spade terminal provided to the red stop wire and ground it along with the white wire.

3 Wire System
  • Has amber turn signals, separate.
  • Has separate bulbs for stop and turn signals (both red).
  • Note: Attach red wire to tow vehicles brake light circuit.
10.) Using a circuit tester or volt ohm meter (VOM), determine which wire attached to the left taillight assembly is the left turn wire. Attach the units yellow left turn wire to this wire using one of the blue wire taps provided. Determine which wire is the taillight circuit and attach the module's brown tail / license wire to it with a wire tap. Determine which wire is the stop circuit and attach the module's red stop wire to it with a wire tap (for 3 wire systems only, see step 9).
11.) Route the units green right turn wire to the right side of the vehicle. Determine which wire is the right turn circuit and attach the green wire to it with a wire tap.
12.) Install the fuse into fuse holder and test the installation with a circuit light or trailer.
13.) Secure all loose wiring with cable ties.

Testing Procedure
With the ground wire connected and all of the other circuits attached, attach the ground lead of a circuit tester to the exposed ground terminal of the 4-flat end. Activate the tow vehicle left turn, right turn, tail and stop lights one at a time. Probe the three receptacles of the 4-flat end to confirm proper functions. If testing with a trailer, make the proper connections and do the same test as the circuit tester using the trailer lights. If a function on the trailer lights does not work properly, disconnect the trailer lights, turn functions on vehicle off and recheck function with the unit with a circuit tester. Then check the trailer wiring for potential circuit problems.

I hope help you with this (remember rated this help).

Good luck.

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I took the vehicle to Bosch, an electrical expert in Germany.

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