Question about 2005 Lincoln Navigator

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2005 Navagator will not go in reverse when a trailer is in tow. When backing up it is like the thansmission disengages and the engine loses power, when I push the gas pedel nothing. Also when the Advance Trac engages on an icey road the same thing happens.

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  • Bruce Smith Jul 14, 2009

    Had is scaned at the dealership, no codes appeared. I understand the power reduction factor, but with the trac engaged or disengaged it goes to no power at all, it simply and totally quits, press the gas pedal nothing. Even the dealer has never seen this and does not know what to do about it.

    Thanks Bruce

  • Bruce Smith Jul 14, 2009

    Yes, it tows just fine. Only when backing the trailer up it does run into the "no power" condition. Engine is ok, transmission I cannot say about, my unprofessional opinion is maybe the computer is reading off the back up sensors somehow causing this. I thought of trying disconnecting the sensors, but haven't tryed that yet, need to research more before trying that. Thanks

  • Bruce Smith Jul 14, 2009

    Had is scaned at the dealership, no codes appeared. I understand the power reduction factor, but with the trac engaged or disengaged it goes to no power at all, it simply and totally quits, press the gas pedal nothing.

  • Bruce Smith Jul 14, 2009

    The trans does engage and the thuck will back up for 5 to 10 seconds, than the engine looses power and goes to an idel with no response when you push on the gas pedal, no rpm increase or torque.

  • Bruce Smith Jul 14, 2009

    Yes, I've had it at a Ford and a Lincoln dealer, taking it back again tomorrow w/ a trailer behind for them to see. I know this is a hard one to solve, thought I just maybe could learn more here as they have not been to solve the issue, yet I hope! Thanks for your response, I will mention the harness to them.

  • Bruce Smith Jul 14, 2009

    Yes Thank you



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Are you saying the trans doen't engage reverse at all? or does it just loose engine power? if the engine power is the problem only in reverse then the engine wiring harness is most likely the problem, it has an open when the engine torque lifts the engine, the power you ask the more movement, but 1st clarify the question about re gear engagement.

Posted on Jul 14, 2009

  • yadayada
    yadayada Jul 14, 2009



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The traction control system is engaged when the system detects any type of tire and wheel slip. In the case of the ice issue, it would be normal for the system to reduce power to prevent the tires from slipping and allow you to move forward slowly.
If you are backing up and the tires begin to slip, the traction control system will engage and reduce power to prevent the slip, unfortunatly if you are towing a heavy load you may not beable to move. I would try disabling the trac control system when towing the trailer, that should take care of the problem for you.
If it continues after you have disengaged the trac system, you will want to have the vehicle scanned for codes. Auto Zone or Advance Auto will do the scan for you at no charge. Record the code numbers for future reference and re-post on this sight for further diagnosis.
Good luck, let me know.

Posted on Jul 14, 2009

  • 1 more comment 
  • Bruce Bracey
    Bruce Bracey Jul 14, 2009

    So it sounds like the vehicle pulls the trailer OK, only when backing the trailer up does it run into the "no power" condition.

    How heavy is the trailer? Have you pulled the trailer before with no problem?

    If I'm not mistaken your Navigator should pull a maximum of 8000 lbs with the appropriate drive train ( large V-8 and trailer towing gear ratio).

    Let me know.


  • Bruce Bracey
    Bruce Bracey Jul 14, 2009

    Was there a mistake or did you want to try someone else.


  • Bruce Bracey
    Bruce Bracey Jul 14, 2009

    Before you give up, try leaving the trailer harness disconnected from the vehicle and try backing up. At this point we don't know if you have a trailer brake issue or there is a problem with the Navigator.

    Good luck,




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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.

Mar 16, 2011 | 2004 Ford F150

1 Answer

Instructions for wiring a moving trailer connector


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

I have a 2003 ford F150 and I bought a factory plug in trailer harnes but the only light that work now is the running light I got back under truck and tried the harnes with a tester and it seem the trailer...

The fuses for the trailer tow adapter are in the normal fuse panels.

Engine Compartment fuse panel
101 - Is the battery charge circuit ( hot in run position )
20 - Left Stop / Turn fuse
19 - Right Stop / Turn
5 - Trailer tow reversing lamps & Trailer Tow parking lamps

Cab Fuse Panel
23 - fuse for the relay for the trailer tow battery charge circuit

All of these are in the owners manual

If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :

Oct 04, 2010 | 2005 Ford F-150

1 Answer

2001 F150 supercrew w/ factory towing - No tail lights on trailer

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.

This is the wiring diagram for the trailer tow park lamps

Mar 09, 2010 | 2001 Ford F150 Styleside SuperCrew

2 Answers


There are a few fuses for the trailer tow adapter.

1st, is the odd location on the 97-98, engine mini fuse panel has a 20 A fuse for the stop / turn lamps. Have seen it covered in tape from the factory on some 97 MY trucks.
This is on page 142 in the owners manual.
If you see one, you can download a PDF version from Ford at :

The others :
1. Power Distribution Panel / engine compartment fuse panel
Fuse #1 - Trailer tow back-up and tail lamps
Fuse #16 - Trailer tow battery charge and stop/turn lamps
Fuse #28 - Trailer tow electronic brake

2. Instrument Panel Fuses ( cab fuse panel by hood release )
#23 - trailer tow battery charge relay

Nov 01, 2009 | 1997 Ford F150 Regular Cab

1 Answer

Trailer connection not working need to know which fuse to change 2005 Ford F150 Lariat

Trailer Tow reversing relay ( non serviceable ) and the Trailer tow parking lamp relay are both fed from Fuse #10 ( coil on reversing relay is fed from reverse lamps & coil on parking lamp relay is fed from the parking lamps ).

Trailer Tow battery charge relay is fed from Fuse #106 ( coil is fed by fuse #13, hot in start / run position from key ).

Right Stop / Turn is fed from Fuse #36 ( powered from MFS circuit for truck stop/turn )
Left Stop / Turn is fed from Fuse #42 ( powered from MFS circuit for truck stop/turn )

Parking lamp is

Oct 17, 2009 | 2005 Ford F-150

1 Answer

What is the towing capacity of a 2005 Seneca? And what gives? It refuses to recognize my make and model so I had to post it under Sonata.

Hey, we all make mistakes. Elantra I have head of. The 2005 Hyundai Elantra can tow 3.086 Lbs if the trailer you are towing is equipped with trailer brakes. If the trailer is not equipped with trailer brakes it can only tow 1,000 lbs. This is quite allot for a sedan. Remember do not tow over 1,000 lbs without trailer brakes and that includes the weight of the trailer. You will never be able to stop it and it may jackknife.

Aug 05, 2009 | 2005 Hyundai Sonata

1 Answer

2005 diesel excursion when towing 8000lb trailer up a hill, seemed to lose complete power - no shifting, couldn't accelerate.

From your symtoms I would suspect a clogged fuel filter. It may seem to run okay without a load, but it requires a larger supply of fuel under load. Anything that restricts the flow of fuel will cause what you described.

Jul 06, 2009 | 2005 Ford Excursion

2 Answers

Trailer towing fuses

Battery junction box (BJB) fuse(s):
  • 5 (30A) (trailer electric brake controller)
  • 34 (25A) (trailer tow turn relays)
  • 42 (30A) (trailer tow parking lamps)
  • 44 (30A) (trailer tow battery charge relay switch side)
  • 63 (15A) (trailer tow reversing lamps

Mar 20, 2009 | 2008 Ford F 250 Super Duty 4WD

1 Answer

Power Steering became real hard to turn after towing

ki kwest
check the belt that drives the ps pump has not snapped and fell off

Oct 30, 2008 | 2003 Jeep Grand Cherokee

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