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Charge trailer battery from tow vehicle wireing

Does truck charge travel trailer battery

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I am having problems with the trailer lighting and brake lights on a trailer behind a 01 kenworth repalces relays and fuse on truck but no change on the trailer


Trailer lighting is notoriously unreliable, especially on commercially manufactured and wired trailers where the manufacturer tries to save money by using a chassis or body earth return instead of a fully wired system and the better quality lamps such a system would require.

In my experience eight out of ten trailer lighting problems are related to a ground or earthing fault or poor quality wire and poor quality terminals being used.
The other two out of ten related to problems with the plug and socket connection (car to trailer).

This is assuming the towing vehicle had the tow socket wired to a high standard in the first place and didn't use the notorious Scotchloc.
The Scotchloc device was adequate for some of the wiring to older vehicles that used thickly insulated thick wiring but they are totally unsuitable for wiring connections that are exposed to movement, dirt and moisture and the thin wiring of the modern vehicle. There are in addition to the blue coloured ones, also red and white more suited to thinner wiring and also a brown one for larger cables but blue seems to be the ones supplied most often and so these are the ones used most often and consequently are responsible for quite a lot of faults where a supply doesn't even reach the tow socket.

When searching for a fault it is best to check the towing vehicle electrics and the trailer separately. Plugging in a known good trailer or lighting board is the best way to check the car socket. I have made a box of tricks for checking both the car and trailer separately, including the grounds and supplies for fridge, battery charging, etc. It will also, with the aid of a lighting board, provide lighting to a towed vehicle that would otherwise have to be trailered.

Apr 19, 2016 | Cars & Trucks

1 Answer

What fuse goes to the 7-way trailer plug that charges the trailer batteries for a 2012 RAM 4X4


the power for the battery charging usually goes directly to vehicle battery with an inline fuse , hope this helps

Nov 22, 2014 | Dodge Ram 1500 Cars & Trucks

2 Answers

I tow a 2004 GMC Envoy behind my RV. Key must be in ACC position to unlock steering wheel. At the end of the day my battery is run down from dash lighting usually needing to be jump started. I installed...


If your plug to towed vehicle has an empty prong/terminal, add a charge wire from RV to positive on battery connection to towed vehicle. A lot of travel trailers have a charge line in the 7 prong plug to charge battery on tongue while driving. Be sure to include circuit breaker in line for protection and don't forget end at vehicle will still be live when disconnected from tow vehicle so make sure it is protected from shorting out against metal,other wiring etc.. If no extra prong/terminal on current plug, switch it over to another with enough terminals to accommodate it.

Apr 08, 2011 | 1997 Chevrolet Blazer

1 Answer

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.

Jan 01, 2011 | 2001 Pontiac Montana

1 Answer

Trailer wiring problem. Tow vehicle is a 2008 Grand Caravan with 4 wire plug. Double checked, plug function works fine. When trailer is plugged to tow vehicle with tow vehicle lights OFF the trailer...


Most likely the brown wire from the trailer connector is connected to a constant battery voltage source, and it should be connected to the vehicle running light circuit, however someone might have wired the trailer connector up that way on purpose so that the trailer does not draw power from the vehicle running lights and possibly damage the vehicle running light circuit. (Dodge/Chrysler vehicles do have delicate lighting systems) Here are some images to help assist you, and the 4 way connector is the same as the 5 way connector just without the blue wire for the trailer brakes.


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bfc4311.jpg

7ac3528.jpg

Jul 06, 2010 | 2008 Dodge Grand Caravan

1 Answer

Why isn't my trailer connector charging the RV battery? I placed a fuse in slot 106, but it still doesn't appear to be working at the factory installed pigtail.


Might want to bench test the trailer tow battery charge relay.

You can also jumper this with a wire in the relay socket, to test the wiring to the trailer tow adapter. This is relay R05

19fa452.jpg

Apr 20, 2010 | 2004 Ford F150

1 Answer

Trailer battery charging from Ford F250 (tow vehicle) How to wire?


just basically have a possitive and a negative cable connected from the battery to a plug on the towbar. then in the trailer have a possitive and a negative connected to that battery and a plug from the trailer to connect with the towbar plug. if that makes sense, then it will charge when connected but maybe only connect when engine is running.

Mar 17, 2010 | 2002 Ford F250 Super Duty SuperCab

1 Answer

Wiring issue on a 1965 Roadrunner Travel Trailer


Generic comments follow:

I'm not real clear on what you are asking ... I can almost guarantee you that you will not find a wiring diagram for your trailer.

Your travel trailer operates on 12 V DC. Your frig, the heater, all the lights, radio, all 12 volts. Your running lights should be getting power from the tow vehicle. While towing, the tow vehicle should be charging the battery. You may find some 110 volt lights inside, but probably not. To keep your battery charged, you have 110 Volt AC power coming in. Your frig may run on 110 V AC but it still needs 12 volts for control. Your Air Cond and Microwave and TV (if equipped) will al,so run on 110.

Regarding the three wires from the battery, there should be a battery charger close by your 12 Volt fuse panel. Even though the trailer is a "vehicle" dont depend on using the frame as a ground like you would in a car. So, that accounts for two of the three - a red or black and a white wire. There may be some dedicated line that the battery supplied to account for the third wire.

There should be a emergency breakaway switch on the front of the trailer. This is a switch with a pull pin. If the trailer breaks away, the pin is pulled out by the tow vehicle and the electric brakes should be automatiocally applied to stop the trailer. This switch should be powered, unfused, directly from the traailer battery and go directly to the electric brakes - presuming you have this feature.

Be aware, this trailer power supply was built and designed for a life style far different from that we enjoy today. If you have a 30 amp cord, as I suspect, 30 amps is enough to charge your battery, run your 12 volt items, run a TV and AC or TV and Micro or Micro and AC but not much else. As you are aware, you have two circuits built with #12 and they are probably protected with a 15 amp breaker though the #12 would be protected with 20 amp breaker in a house. The cord is only rated for 30 amps and it may be tired, unless you have replaced it.

I hope I have provided a little insight to your situation. If I can be of further assistance, please let me know.

a

Sep 20, 2009 | General Electric GE INDUSTRIAL SYSTEMS...

1 Answer

I have an early 90's Starcraft pop up camper. I just went to hook it up to the van and the travel lights (running, brakes, directionals) don't work at all. All lights worked when the camper was stored last...


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.


Apr 25, 2009 | Sport & Outdoor - Others

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