When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hey everyone we have been working on my 01 f250 for two day now trying to figure out why it's not charging and we have narrowed it down to the green wire going to the alternator. I need detailed diagram of where the wire goes before I start pulling all the loom off any help would be awesome thanks in advance
Looks like Hootr and I were posting at the same time! My apologies for duplicating information.
I'm having truble getting power to the lg/rd wire the bulb in the cluster and the diode are both good but if you take the 42 pin connector apart and put power back from alternator it comes out on the yellow wire
I'm having truble getting power to the lg/rd wire the bulb in the cluster and the diode are both good but if you take the 42 pin connector apart and put power back from alternator it comes out on the yellow wire
I'm a bit confused what your asking about, my apologies.
The LG/RD (light green/red) wire which you originally described as "green" is pictured above in each of the drawings, including the one from Hootr.
It goes from the generator on circuit ID 904 to the 42 pin connector where it is pin 10 on the female side and pin 10 on the male side, both still LG/RD. Then it goes to the instrument cluster where it is on pin 8. Then it goes to the central junction box on circuit 1044 as a WH/YE (white/yellow) wire. I did not include connector 242b in my post from yesterday, but if you need it, I can grab it.
01 f250 it's not charging and we have narrowed it down to the green wire going to the alternator.
How did you determine that the truck is not charging?
What did you test? (Alternator? Voltage?)
Where did you test? (On truck? Off truck? At B+ terminal on alternator? At sense circuit (A terminal) on alternator?)
How did you test whatever you tested? (Back probe with control circuit connector plugged in? Connector unplugged? KOEO? KOER?)
What caused you to "narrow it down to the green wire going to the alternator"? What was the voltage of the green/red wire with key on, but engine off? What was the voltage of the green red wire with engine running? Where did you measure the voltage on the green/red wire? Between the CJB and the bulb? Between the bulb and the alternator? With the alternator plugged in or not plugged in?
Originally Posted by Ryandavis357
I'm having truble getting power to the lg/rd wire the bulb in the cluster and the diode are both good but if you take the 42 pin connector apart and put power back from alternator it comes out on the yellow wire
What sort of "power" to the lg/rd wire are you looking for, and when? Are you looking for around 2 volts +/- 1v with key on? Are you looking for 12 to 14 volts with engine running ? (variance due to glow plug status and timing of voltage check after start)
You mentioned "bulb in the cluster and the diode"... What "diode" are you talking about? Are you referring to the 470 Ω resistor? How did you test this resistor to be "good"? If by diode your are referring to those inside the alternator... there are 6 diodes in the stock alternator... did you test all 6? How did you test them to determine they were good?
Why are you taking the 42 pin connector apart to diagnose a charging issue?
What did you mean by "put power back from alternator" with the 42 pin connector separated?
Sorry to ask so many questions, but from the very scant descriptions shared thus far, it is hard to figure out what is going on, other than the appearance of a departure from Ford's recommended diagnostics routines for resolving alternator and charging issues.
If you want to check to see if the Ignition circuit to turn on the voltage regulator inside the alternator is OK (ie, the lg/rd wire), then back probe the lg/rd wire with all the connectors connected, and with the engine running, and compare that voltage with battery voltage. If it is the same, then there is no issue with the lg/rd wire.
To piggyback on the "it is hard to figure out what is going on, other than the appearance of a departure from Ford's recommended diagnostics routines for resolving alternator and charging issues" stated by Y2KW57 above, I have listed the Ford "symptom chart" below regarding alternator (generator) testing and diagnosis.
Feel free to let me know which pinpoint test you would like me to attach here, or you can grab them for yourself by posting in the thread linked below. This happens to be the same thread that Hootr posted yesterday.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
