Question about 2006 Ford F-150

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There is no 12V power to the trailer battery.

After towing a while the trailer battery is dead. Battery is ok. I checked for power at the correct fuse and could find no power there either. I am checking with a good voltmeter.

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This is most likely an issue with the wiring harness going to the connector on your truck you need to start at the connector at the back of the truck and walk your way forward to the breakers under the hood (rarely is the 12 power on the trailer harness connecter simply fused since it is a higher current circuit, it usually uses a breaker just like your headlights). Before you do this find a copy of the wiring diagram for your truck so you know what you are looking for. Also a dead battery normally will not fully charge in the normal time span of a trailer being towed as you can typically figure over 6 hours to charge the type of battery (deep cycle) that is in a trailer.

Posted on Apr 15, 2014

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SOURCE: no running lights on boat trailer towed by 2008 ford f150

You can purcahse a tester which will connect into the F-150's wiring harnes. If the led lights up, the problem is witht he trailer's wiring harness. this tester will indicate the proper operation of the brake light and turn signals.

Posted on Jan 20, 2009

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SOURCE: 2003 ford escape, change battery

you may have to have the computer reflashed. Only the dealer can do that also. that is very bad for all electrical components in the car.

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SOURCE: 1999 f250 will not charge battery

It appears that the alternator is still not charging the battery.Charge the battery up,and refire the truck.Check voltage with a voltmeter,directly off the back of the alternator.Most all alternators of your year model have the voltage regulator built into the alternator.If the alternator isn't producing any voltage,then it is bad,even if it is new.I have had defective new parts before.

Posted on Aug 10, 2008

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SOURCE: Fuel gauge doesn't work.

Disconnect the wires from the sending unit. Using an ohmeter, measure the resistance of the internal coil. If there's a good continuity (1 to 1.5 kilo ohms) chances are, the wires are pulled. If resistance is more than 1.5 kilo ohms, replace the sending unit.

Posted on Jun 01, 2009

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SOURCE: Instrument panel went dead

Checked Every fuse in the fuse box (no small task).This includes #4 - Power point Instrument Panel, #14 - Day time running lamps (auto lamps doesn't work nor does auto lock), #27 - ignition switch run feed, #35 - Instrument Cluster, #41 - Instrument Cluster, #42 - Delayed Accessory, #45 - Ignition switch run/start feed, #102 - Door locks body security module, #103 - Ignition switch, #110 - Ignition switch, & #116 - Ignition switch. But I also check all other ones as well, they all register OK. AC panel & radio work. Turn signals work. Mileage does not work, trip computer does. So, basically, everything works except auto head-lights, auto locks, and the dash cluster (no MPH, RPM, mileage display, Fuel, Temp, Tran Temp, and Oil Pressure).

Posted on Sep 30, 2009

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Hello my volvo has no power at all! wondering what i blew fuse etc i don't know


Did you connect the Batteries you jumped with correctly? In Parallel you have 12 volts (correct) in Series you have 24 volts (incorrect). Check your main power fuse ( Big 60 amp or 40Amp) located in plastic box close to the battery on the inner fender well. Be careful jumping dead batteries! Explosion hazard exist, wear eye protection always.

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Suburban towing package fuse box location


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Have no power out of the trailer plug 4or 7 prong,where should i look for the trouble?


Not sure which part you mean no power.

For the New Body style 2004 ( not a Heritage or Lightning model )

If both Stop / Turn pins & the parking lamps, might want to check the ground pin to make sure it is good ( or what you are using for ground on the test light / meter ).

The trailer tow parking lamp circuit is fuse #10 to the parking lamp relay

The stop / turn circuits also have fuses on each one, Fuse #36 & Fuse # 42 ( R & L ).

The 7 pin has fuses for the battery charge pin ( hot in run position ) and the reverse circuit ( hot in run & when in reverse ), Reverse is also fuse # 10 to the trailer tow reversing lamp relay & the battery charge pin is fuse # 106 to the trailer tow battery charge relay.

Could be all the fuses are blown, or what you are using for ground on the meter / test light is not a good ground.

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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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Did you find that fuse under dash or hood.Sometimes there's one under hood, or dash that may be labeled aux power or something like that. Also, did you check it with key on and vehicle started as well? Can you not wire jack to battery on front of trailer or don't have battery there?

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Not sure which fuse you checked.
The Engine Compartment Fuse Panel ( Battery Junction Box / BJB ) is where the fuse is for the trailer tow adapter parking lamps.
Fuse # 5 is the fuse for the parking lamps, and the reversing lamps.

Next is the trailer tow adapter park lamp relay. This is what BJB Fuse #5 feeds, and the coil is operated by the truck's parking lamps. This is also in the BJB, Relay 201, it is the 1/2 size relay.

Not sure what you took a resistance reading from on the trailer tow adapter.

If you want, you can pull the trailer tow park lamp relay, and jumper the normally open contacts, which should provide power at the trailer tow adapters, regardless of the truck's lights.
4418e16.jpg

This is the wiring diagram for the trailer tow park lamps
c2f0bcb.jpg

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you might search for a burnt fusible link that feeds that harness...try looking where the battery cable is connected to the starter motor underneath.sometimes you cant tell if a fuse wire is burnt...you gotta tug on it slightly...if it stretches like rubber,the wire inside is burnt/separated and designed to do so there instead of frying the whole harness

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Tow plug


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.



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