Well guy's i come here looking for your help once again...I have a 2007 F-250 6 litre, and about a month ago i changed the alternator and both batteries due to a pulsating light issue i was having, i had gotten the alternator tested and they said it was on its way out, then had the batts tested and one was bad so i changed both all said and done had about 400 bucks in it ouch....but it fixed my problem and all was good.....until this past friday on the way home from work (hour and 15 min trip) i noticed the dash lights and headlights dimming/pulsating brighter then dim it was really noticable also with this the engine is kinda making a abnormal pulsating sound , saturday the prb was gone, today it is back again as bad as ever.....what could this be????...another bad alternator??? or could the glow plugs be stuck in the on position due to a bad glow plug module, or could it be a bad FICM to cause the lights to do this??? Can anyone think of what it may be.....I will prolly just take it by the dealer this week and get em to look it over, has anyone experienced these conditions??? It is really frustrating me....

 

Aren't you still under warranty?

 

What alternator did you put in it?

 

Check the plug connector at the alternator, the orange wire is the reg.sense wire which is known to break in the plug. this can cause the pulsating your describing. If the plug is good and the alternator has a good power and ground, you may have a bad voltage regulator in the alternator. I have seen big problems with motorcraft regulators as of late, it seems that whoever they have assembling these things are not loading the brushes properly, causing them to hang up.this will cause the same pulsating that worn out brushes will. Good luck.

 

GREAT INFO!

Thanks toolman!

 

to answer your question bismic, i put a 140 amp reman. motorcraft alt in it....only a month ago, and two brand new 850 cca duralast gold batts...and i guess i will check the plug tomorrow...idk.....yes i am still under the powertrain warranty, but the powertrain warranty did not cover tha alternator......

 

o and toolman, what exactly should i check for, should i pull on the orange wire to see if it is loose???

 

Yes, wiggle it and see if the pulsating stops.

 

We all have a 3 yr / 36k mile bumper to bumper - covers the alternator.
I assume you are past the 36k miles? That is what conger was asking - it was reasonable to assume that you MIGHT still be under that....


I am sure you know, but for those who don't:

As a 2007, you have a Powertrain warranty for 5 yrs / 60k that does not cover the alternator.

Then you have the 5 yr / 100k Engine warranty - again, alternator not covered.

 

Ok guys, so if it turns out to be the alternator plug...how do you go about fixing it....do you just splice a new wire/plug into the vehicles wiring harness??? I hope i don't have to get a whole new wiring harness....

 

You should be able to go to the dealer and buy the pig tails, and connector if you need it, you then just cut the old one of and slice it in. make sure you use the butt connectors with the shrink wrap on them. When you crimp them you heat them up and the wrap melts causing a water tight seal.

Sarge

 

Install just as sarge said, the plugs are also available at most auto electric shops and auto parts stores.

 

If infact it's the pigtail and you're somewhat capable - you can fix the current pigtail w/out splicing it.

You can release the broke wire from the pigtail using a pic, or sometimes a pocket screwdriver. Once released, cut the wire and crimp another end on it. Just takes a little time and patients. A much cleaner job and no splicing.

 

Uhh....I think we just said the same thing. Ford offers the connectors as a kit, which means you get the connector, the wires and the pins, you also get the water proof salmon/butt connectors. Either way you say it, your gonna cut and splice a wire. The connector kit is a nice clean install and will include all the parts you need to make it neat.

Sarge