So when it rains sometimes my ABS will go off till I drive it down the road a bit... Where is the location of the ground wire for this thing? I've checked up under it and no wires are cut or burnt... just wonder where this thing grounds to... if I can find that I may be able to clean it and fix the sensor.... because something makes me believe the sensor isn't bad, because some times it works for a half mile or so... before it goes back on.

 

both the pos and neg drop from near the fuel tank (driver side) and run on top of the axle tube to the sensor on the diff. when mine broke i could not till until i pulled the shield off the wires. its to wet out for me to get any better look at it than that for now

 

Last yr, I overloaded my '05, which resulted in the wires getting pinched between the bed and top of punkin. simple to peel the harness open and re solder the wires back together. they should have welded a stop on top of it to keep this from happening. Sooner or later we all overload, and when you hit a bump, Blink! ABS light comes on.

 

thats what happened to mine but i hut a transfer of 1/2 paved road and then the old road (about a 4 in lip @60mph) and about 3 miles later it was on. i think mine hit the dual exhaust pipe not the bed though.

 

Lol, as long as were sharing about this....

My ABS light came on from my wires melting on my dual exhaust. They are no where near the exhaust, except when I had a car trailer loaded up and pulled it with my truck. Squatted the end down and moved the pipes too close to the wires. Melted them.

When I unloaded the car the ABS light went away and I just forgot about it. But when the snow started to fly the wires got wet and shorted to each other turning the light back on....

 

Glad I found this thread. I'm having the abs light problem with speedo drop. Changed everything even the gear lube no luck. Today I trace the wires!!

 

Yeah mine turned out to be a bad wire... fixed it.

 

I see the wires coming from the sensor. They run directly into the wiring harness. I don't see a ground wire anywhere. I traced the harness from this point all the way back to the PCM. So not sure how I'm supposed to clean the ground.

 

I'm still working on this issue, but from what I've learned so far, I don't think this particular sensor has (or needs) a ground. Based on what I know about Ford's general wiring logic, it looks like this sensor has one 'supplied power' or 'hot' wire and one 'signal' wire that provides the info back to the PCM or ABS controller.

The guy that welded my Flowmasters in back in '04 got wild with his torch and melted the whole feed up where you can't see it. (I'd like to think that if he had seen what he did, he might have fixed it - or at least mentioned it...) It continued to work until Washington State started salting roads, and now the exposed conductors have corroded away.

An open or high-resistance on either conductor will have the same result: no signal from the rear ABS sensor. If you've ID'd both wires at the PCM connector, pull the connector off the sensor and the PCM, bridge the two sockets at the sensor end with a jumper (paperclip), and test the continuity at the PCM connector. If there's none, or high resistance, then start narrowing down the location.

(I realize that since your post was a couple weeks ago, you've probably solved it by now. If so, please let us know the solution, and I'll regard my post as help for those that follow. If not, I hope this helps.)