[Painted Horse]

While you are sitting up tonight waiting for the kids to go to sleep. How about pondering my problem.

Saturday evening went over to dad's house and watch a football game with him. Truck sat out side for 4 hours ( probably 20*F. When I came out, it was dead, No crank. My wife jumped me off her Ford Explorer and it started right up. Next morning same problem. Put the charger on each battery for couple of hours and took it up and had them tested. Batteries tested just fine under the load test.

Tuesday while driving up the freeway, my speedo stops working. It will occassionally jump up to 25 or 30mph. But for the most part it sits at 0. I drove 30 up and 30 miles back from a job, plus around town today with last minute shopping , and the trip totaled 5.6 miles. I've had an Edge display on my truck for 2 years and it also displays Speed, but it also shows 0. So based upon the other threads I suspect the VSS.

But the engine has now started dying occassionally. In particular when I touch the brake pedal. For example, I went out and feed the horses this morning. Left the truck idle. When I came back, the engine was in the High Idle mode as it usually is during warm up. When I stepped on the brake pedal so I could change from Park to Drive, the engine died and the speedo jumped to 50mph, stayed there for 10 seconds and dropped back to 0. On other occassions, when I back out of the garage in the morning, as I back up when the mirrors get close to touching the side of the garage doors, I touch the brakes to double check my clearance, Each day as I've done this the engine dies. So using the brake seems to trigger the engine dying. But not every time.

The engine always starts right back up. I've had no more problems with the batteries. Just no Speedo, No Cruise control, and occassional engine dying.

It's a 2006 F350 King Ranch with 69,000 miles

 

[onebadaries]

have your altenator checked out

 

[ron68coug]

I don't see the connection with alternator, but I am fighting similar problem on my 01. My speedo quit working, the trans is in safe mode, then my turn signals quit, then my dome lights started coming on, (sprayed penetration oil in all door latches and that seemed to go away). Now my overhead thermometer is stuck at 3 degrees. All this in 2 days. I'm going to dig into it tomorrow and will let you know if I find anything. The most common fix is the speed sensor on top of rear axle, $22 at Ford, for the speedo problem, but did not fix my problem, I'm going to check all of the chassis grounds I can find, swap abs module off my work truck, check speed sensor wiring, etc. Will let you know if I find anything.

 

[Painted Horse]

I took it in to the dealer. I needed an oil change anyway.
They found a bad VSS and both batteries are bad. Which was creating a low voltage problem. I suspected the batteries to start with. The OEM Ford batteries never last more than 36 months in any Ford product that I've every bought. So two new batteries, a new VSS, I had them change the oil, differential fluid and transfer case fluid and rotate the tires.

We got a foot of snow over night. Bottom side of the truck is caked with slush. I just didn't feel like crawling under the truck on a wet foor and having crap drip on me to work on it.So I let the dealer do it all.

 

[ron68coug]

I found my problem, wire backed out its position in the plug behind fuse box. pm if you want more info

 

[onebadaries]

You really need to have your alternator checked because if it working properly, you cannot have a low voltage problem. Once it is started, you can take both batteries out and if it is charging properly it will run fine.

 

[Painted Horse]

Alternator was fine. Ended up replacing the batteries and the VSS Everything runs fine now.

 

[GeauxStroke]

I am experiencing a similar problem in my 99 F350 7.3L. At first it was blowing 30A fuses (No. 28) unplugged the fuel heater and it stopped blowing fuses. Truck ran fine except the speedo stayed at Zero. Drove it to work. Left work and it was dark. Lights on and everything working but seemed a bit dim. About 5 mins into driving the radio goes out. Then the head lights and dash lights get really dim. I have an air horn wired in as well and it too was weak. Windows were weak rolling down. This morning...no dice on starting. So I put in a new alternator in, jumped it and tested it and its fine. Batteries staying at 11.6V which is low. It was running perfect before it started blowing 30A fuses. It all started after a hellacious snow storm...any clue??? I'd rather figure it out myself before ford charges me out the ass for electrical diagnostics and repair.:icon_rolleyes: