Tow red signal - Epson STYLUS R230 InkJet Photo Printer

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.

You need to have a diagnostic scan tool hooked up ,glitch in one of the control modules or a wire in the circuit shorting to ground ! probably something simple but hard to find ! With a factory scan tool they can check the input signal to the BCM ,PCM .
Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) or transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again, or cycling the ignition switch disables tow/haul mode and returns the transmission to a normal shift pattern.

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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 way tow vehicle side.
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.
5 way tow vehicle side.
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.
6 way tow vehicle side.
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.

6 way tow vehicle side.
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.

7 way RV flat blade tow vehicle side.
7 way RV flat blade trailer side.

I see the UK after your name. If it means across the Atlantic, this solution mught not be appropriate, but if these colors are present in your wiring harness, then what I say is correct. By electrical towing standards. white from the tow is ground which is any clean spot to connect to on the frame of the vehicle. Brown is connectted to the tail, parking, or running lights which is one of the 2 wires that connect to the Two-filiment bulb in the rear reds lights of the vehicle. The green and yellow are the trun signals (left yellow & green right) or (left green & yellow right) which are connected to the other wire in the pair to the two-filiment bulb. These two colors are combined when you push the brake pedal to show stopping lights. So if you don't have break lights you probably don't have turn signals. There are no back up lights in a tow situation. Do not cut your vehiicle wires. Use crimping connectors that crunch on to your existing wires with another wire. Have extra fuses for myyour vehicle.

Check for the tow relays in the under hood fuse box. Black box behind the battery on the passenger side. Do a web search for 'titan tow relay' for more info.

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



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.

CAV CIRCUIT FUNCTION 1 Z13 12BK GROUND 2 B40 12LB TRAILER ELECTRIC BRAKE OUTPUT 3 L76 12BK/OR TAIL LIGHT (Trailer Tow Relay in PDC) 4 A6 12RD/TN* FUSED B(+) (40A, Always Hot, F8 in PDC) 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 FIGURE 1: 7-Terminal Trailer Tow Connector

When you say that you have power up to the camper, do you mean power through the pigtail/wiring harness with the tow vehicle connected?

The trailer harness wiring is the only way to power these exterior camper lights, i.e., through your vehicle. There are no fuses within the trailer for the exterior lights. These lights are only fused from the tow vehicle's fuse box. So either the connections in the trailer harness are open, or they're open at the tow vehicle connection.

Do the turn signals work on the tow vehicle? If yes, then the only other thing to check is the turn signal flasher in your tow vehicle. A heavy duty flasher is recommended.

From the trailer, yellow, white, brown, red, green, is connected to your vehicle backup, ground (frame), right turn signal, left turn signal, running lights, respectively.

The trailer's blue wire is for an electric brake connection to your vehicle.

The trailer's small black wire should connect to the vehicle's hot, 12V lead for the interior lights. The large black wire at the trailer hitch is for charging an RV battery on your trailer, if it's supplied with one. Of all of these wires, only the large, 12 gauge, black wire goes to the 25 amp converter, which is fused, for the inside lights of the camper.

I hope this helps.

look goto autozone they have a all in connector for towing so much me easer about 40 dollars you go back to driver side rear harnes when you unplug it the pig tail joins all connectors to geather along with your traller pig tail no mus no fus

I take it the blinkers and brake lights work ok when not hooked up to the trailer? If yes, then the wiring to the tow hitch is not hooked up correctly. How many wires to trailer pig tail connection? U can have up to 7 depending on what you tow. Check to make sure these wires are hooked up from the truck to tow plug correctly: 7 wired---
brown-Rt turn and brake light, yellow-backup, white-ground, blue-electric brake, green-tail running lights, black-battery charger, red-left turn signal and brake light. Let me know if u have something other than 7 wire, I'll get the wiring color and source info for u.