Most likely the rear differential sensor, or its associated wiring. Usually, the flashing light means some thing from the flywheel to the rear end is off or worn, but most every time Ive seen ir ir heard about it, its the sensor.
thanks i will check that i have ordered factory service cd but most times on hand experiince is much better when the light flashes shifts hard hard on fuel and really doggy just over 100000 miles with 15 boxJohn M said:Most likely the rear differential sensor, or its associated wiring. Usually, the flashing light means some thing from the flywheel to the rear end is off or worn, but most every time Ive seen ir ir heard about it, its the sensor.
what and were is gem module it a powerstrokesoundguy said:when you figure it out, let us know.
my 99 f350 did the light flashing thing, but it was a bad GEM module
thanks what does the gem module control if i disconect battery light stays off for 4 to 5 miles do you know if there is a test for itsoundguy said:mines a psd as well.. gem module is back side of the fuse box... which is about 10" to the left of your left knee, behind the emergency brake release. they are about a 500$ part.
I hope yours is something ez like the sensor mentioned.
this is a base stake truck no power anything and i dont have any other electrical issus code reader we have turns laptop in to anilizer will do all ford and north american models cost a thousand bucks needed it for our 6 litre i dont know how to use it or know much about it but my son does im pretty much from old school looking at gem modules on internet cant seem to find any pre 99 thay are around 260soundguy said:the gem is pretty much the go between , between everything electronic in t he truck and the ECU.
and I do mena everything.
when my GEM ( generic electronic module ) went out. i had no keyless entry fob, nodome lamps, no door kick panel lamps.. dash and gaug ecluster did weird things.. doors locked and unlocked randomly. even made starting eratic.
you need a ford powerstrok specific code reader to test the truck. the generic code readers won't read any of the special code data that is manufacturer specific.
I have such a reader for my 04 powerstroke.
thanks for the help inow more know than i did and gives me some starting points factory repair cd should be here this weekwill take look at it for ideas to friend of mine has large auto wreckers may have right gem module and rear end sencer probibly can test sencer with ohm metersoundguy said:don't know what to tell ya
thats thr first thing im going to try then im going to pull o d harness in steering colum iwas at dealer today they said that harness is a problem i got ford dealer repair cd in mail yesterday son is n his way home from georga with a load of penuts when he gets here ill get him to run cd for me he understands some of the electrical better than me i dont put truck back on road till may but want to get it fixed also does anybody know if these trucks have torque coverter problems on a ford truck forum a guy said his flashing light was caused by bad torque and if you keep drtving will take trans out of it but when i asked dealer he said they have never sold a torqe for one of these but ford has a recall on freestar torque converters nowJohn M said:SOMEBODY is rebuilding the GEMs, I just cant find it. I know somebody is. But I still think its the rear end sensor.