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Axuilary pin for trailer aka always hot pin doesn't have any power. Is there a fuse?

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Ya there is a fuse in the fuse box

Posted on Dec 11, 2012

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Posted on Jan 02, 2017

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SOURCE: no trailer lights except running lights

Possible corrosion break in the Vehicle Trailer Plug.
Regards,DT

Posted on Aug 29, 2009

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Reverse parking sensor module


the reverse lights are dead, both>? that is the correct post'
or lamps stuck on? post a real symptom.
own a simple voltmeter?
got the trailer tow option package? Factory !

1: check fuses. always first step in all electric work and for damage near target bad parts. (trailer hictched. hacks are #1)
4.0 L or 4.7L
on this car it has A/T and PRNDL(4.0L) switch or TSTA switch that DRIVES directly the. the lamps at pin 1 of Tranny switch, VT-BLK. color,
if pin 3 is hot, keyon and pin one is 0v in REVErse
then the switch is bad, or maladjusted. READ FSM on that.
if the pin3 input is 0v, then you lost power to this switch.
if the reading is low say 6v and not 12v at the lamp or pin1.
then you have short in the line, very common on trailer hack jobs.

just 2 measurements and bingo the cause.

the automatic day night mirror options connects to the backup lamp
too, so it can short and cause 2 things
short to ground, blows fuse or dims the lamps.
short to power , lamps stick on.
all these facts from FSM. in 5min.

Nov 08, 2013 | 2001 Jeep Grand Cherokee

1 Answer

#4 pin on towing plug does not have power even with key on. Can you tell me what fuse it may be? I have looked at all fuses and can't find one blown. Or, could this be a different problem?


Are sure that pin doesn't control the brake lights or blinker? In that case the on position of the ignition alone would not provide power. Have a second person engage the brakes and blinkers wile testing.Depending on the trailer type it could even be for reverse lights.

May 01, 2012 | Ford F-350 Cars & Trucks

1 Answer

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

Can't get the trailer running lights to work on my 2006 F350 Diesel 4X4. Tried the trailer on another vehicle with the same plug and they worked perfectly. All other lights work with the trailer when the...


Check fuse 28 in the fuse block under the left side of the dash. There is also a relay for the trailer park lamps in that same fuse block. The fuse and relay are the trailer parking lamps and run independantly of the vehicles parking lights. You can also try backprobing the other trailer plug (you should have one 7 pin and one 4 pin) to see if there is power at the park light pin. If there is power at the other trailer plug than the fuse and relay are bad and you may have a bad/corroded plug or bad wring to the plug that doesn't work.

Nov 04, 2010 | 2006 Ford F 350 Super Duty

2 Answers

Which fuse is for the trailer lights


The aux fuse panel in the engine compartment on the 04-08 has nothing to do with the trailer lights ( that is ABS, clock spring illumination, 4WD and the diode for the AC compressor ).

All the fuses are in the CJB ( aka Central Junction Box, cab fuse panel ):
The trailer parking lamps
Fuse #10 and relay #201
Trailer Stop / turn lamps
R: fuse #36
L: fuse #42
There are a few others with the reversing lamps and the battery charge circuit ( for the 7 pin adapter ).

Bit easier than trying to read each line, is to download a PDF copy from Ford, so you can search on keywords ( in this case trailer )
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Dec 26, 2009 | 2005 Ford F-150

2 Answers

I have a 2008 Ford F 150 with factory installed trailer wiring. I bought a trailer plug tester. It shows the tail light function to be dead. Brake lights, turn signals all work. Any ideas?


The trailer tow adapter parking lamps is fuse #10 in the cab fuse panel. There is also a trailer tow parking lamp relay that powers them, which could have a problem as well.
Start with the fuse, and maybe check both the 7 pin and the 4 pin for the parking lamps, could be a corroded pin on one of them causing the tester to not see the power on the pin.

Dec 17, 2009 | 2008 Ford F 150 2WD

4 Answers

I have a 1997 Ford F150 4x4 Supercab Stepside with 5.4L and factory towing package. On the factory trailer wiring plug I am not getting power for turn signals or brake lights. Running lights and brake...


It is a possible option that the relays for the Stop / Turn are having an issue or the fuse in the Engine Mini panel is blown ( page 142 of the 1997 owners manual )

On the 1997/98 MY this is in the aux relay box in between the Engine Compartment fuse panel and the engine mini fuse panel.
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The output of the MFS ( Multifunction switch ) triggers the relays, to use the trailer tow fuse to operate the trailer lamps. The fuse to supply power to the Normally Open contacts on the trailer relays should be hot at all times. You can verify this with the diagram below by metering from pin #3 to pin # 2 [ground for coil] or to another known ground.

These are 1/2 size Ford ISO relays, and can be jumpered to make testing easier ( and with this diagram you can bench test them with a meter to check resistance over the Normally Open contacts, when applying power and ground to the coil ).
3a3e4ca.jpg

I am not 100% sure on the 97/98 MY F-150 about the location of this connector, but the 99-03 have all the wires to the rear of the truck via a connector along the driver's side frame rail, that you can check for ( easiest with the spare lowered )
777e616.jpg

Start with the Fuse in the Engine Mini panel, to see if the 20A fuse is good and work back towards the trailer tow adapter via the relays. I am going with the obvious blown fuse for the Stop/Turn lamps for the trailer.

Dec 11, 2009 | 1997 Ford F150 Regular Cab

1 Answer

I need wiring to install a new radio in my 2001 f-150 acc-battery-ground what are the colors ?


Abbreviations used :
CJB ( aka Central Junction Box, cab fuse panel )
BJB ( aka Battery Junction Box, Engine Compartment fuse panel )

In the factory connector :

Hot at all times from CJB Fuse #1 is pin #9, light green w/ violet stripe wire
Hot in start from CJB Fuse #20 is pin 3, Red w/ black stripe wire
Hot in Accessory or run from CJB Fuse #8 is pin 10, Black w/ Pink stripe wire.

Grounds in the connector :
pin 2, black
pin 11 black w/ light green stripe
pin 16 black w/ light green stripe.
pin #1 light blue w/ red stripe is the instrument illumination, after the cluster dimmer switch.

I would stay away from using the black w/ light green stripe, I seem to recall those are the shields for the speaker pairs.

Bit late on the reply, just caught this one. If you don't have it don't, good luck

Sep 30, 2009 | 2001 Ford F150 Styleside SuperCrew

3 Answers

Wiring for a trailer


u must install the fuses for the system in he underhood heavy duty fuse box, it will be marked trailer tow

Mar 17, 2009 | 2006 Ford Escape

1 Answer

I need a wiring diagram for a 7 pin trailer board plug


Here's one
08-33-93f1.gif 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

Mar 12, 2009 | 1993 Land Rover Defender

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