electrical issues

[hogboy]

help, i have a 2006 Expedition which has decided to start and give me issues. First off the fuse in position #14 keeps blowing, right power window becomes inoperable, the reverse lights do not work and the back up sensor then does not either. I have looked all over for help, a friend suggested to post it here for the quickest results. This all started after the alternator went out and was replaced.

 

[bedrck46]

the only thing fuse 14 controls is
Temperature blend door actuator (19E616)
Daytime Running Lamps (DRL) ignition relay
Reversing lamps relay
Digital Trans- mission Range (DTR) sensor

The parking aid Mod get it power from fuse 27 and also get a signal form the Digital Trans- mission Range (DTR) sensor The DTR could be the cause of fuse 14 blowing

 

[hogboy]

ok thank you,

How does one test the digital transmission range sensor and where do I find it?

The other thing I was told was the reason that fuse #14 blows is the fuse panel is now faulty and will always need replacing when this takes place consistently. I thought that this was a little crazy

 

[bedrck46]

The DTR is located on the transmission I will send you some information But will not be able to send it until morning

 

[bedrck46]

The reason that a fuse blows is because something has shorted and thus it blows the fuse It is a way to protect the circuit and wiring One thing you can do is to disconnect the connector to the DTR sensor and then install a new fuse and see if it blows But don't drive the vehicle with the DTR sensor disconnected as it also controls other functions

 

[bedrck46]

Have attached some prints for you. Notice that most of your problems are associated with the circuits that go through the DTR sensor Pic that shows the location of the sensor attached

12-01 charging system
13-16 shows fuse 14
29-03 DTR sensor circuit
93-01 Reversing lamp circuit

As for the fuse block there are 5 relays on the circuit board that are not user replaceable (check your owners manual for info Relay R301,302,303,304 and R305) If they go bad you would normally have to replace the whole fuse block $300.00) they can be replaced if you know what you are doing and there is a recent post on here about that problem. I will send you some more information on your problems in a short bit

 

[bedrck46]

Can you tell me when the fuse blows does it blow when you shift into reverse or does it blow when you turn the vehicle key on to start. some of the items will get power when you first turn the key to start/run The reversing lamps and parking aid sensors will only get power when you shift into reverse

 

[hogboy]

I tried a new fuse tonight with the heater shut off and headlight switch at the off and not the automatic setting drove it about a mile backed up into my yard and it all works so far. I will do more testing of all this as the week goes on. Thank You so much for your help thus far.

 

[bedrck46]

Keep me posted also if the fuse blows try to determine when and what you are doing when it blows Depending on that information I may be able to narrow it down for you

 

[hogboy]

I have tried different things but I have not had much time this week due to the frigid below zeros up here. My wife noticed that the daytime running lights do not work anymore. I also found out that the fuse will blow running the car down the road for more than just a few miles. The longest that I kept the fuse intact was with the heater completely shut off but it still blew on me. Does the trailer light socket also affect the fuse #14 because I noticed that does not look the greatest.

 

[bedrck46]

check fuse #40 and also make sure fuse #14 is good and installed
Fuse #14 controls power for the Daytime running lamp relay but fuse #40 provides power to the lamps.

The Trailer Tow circuit does involve the reversing light circuit and it could be possible that could be causing fuse #14 to blow Check all the wiring to Trailer connector

Do you have a 7 pin or 4 pin connector for the trailer tow? If you have the 7pin connector that doe have the reverse lamp circuit in it The 4pin connector does not

If that is the case then repair the wiring to the connector

 

[hogboy]

well I have some more time to test items. I have found that the trailer wiring is now repaired, inserted a new fuse in slot #14 no longer does it blow but there is no reverse lights or daytime running lights. Now what?? I can't afford to take it in to the dealer. I was wondering what type of checks to do next. My concern is to what type of check on the dtr to make, and now is my fuse panel ruined as to now the fuse is not blowing and the reverse lights and daytime running lights are inop?

 

[bedrck46]

Did you check fuse #40?

 

[bedrck46]

print of daytime running lamps attached

 

[hogboy]

Yes I did check fuse #40 it is good. I checked it in place with a test light and I removed it to check it with a multi-meter it checks good. But I still have no backup lights/sensors or daytime lights. Now fuse #14 does not blow and the back up lights don't work that is why I was concerned that the fuse panel is cooked.

 

[bedrck46]

sounds like you need to start checking the circuit for voltage at various points along the wiring or check for voltage at the relay sockets. Also could be possible that there is a cold solder joint on the circuit board in the fuse panel. Check the voltage at the relay contacts and that may prove the circuit boards