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Virtual Wrench
Virtual Wrench, Dodge Mechanic
Category: Dodge
Satisfied Customers: 14612
Experience:  35 years Master Mechanic
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99 Dodge: a 5.9 cummings..overdrive..alternator..wiring

Customer Question

99 Dodge 25000 with a 5.9 cummings, will not charge, will not get overdrive. Ive tried everything to get it to charge and it will not. new alternator, new computer, checked all wiring. ive replaced the ecm and bcm.
Submitted: 6 years ago.
Category: Dodge
Expert:  Virtual Wrench replied 6 years ago.



Have you checked the 140 amp "Gen" fuse in the PDC?


Would you like a nice wiring diagram of the charging system?



Customer: replied 6 years ago.
yes it has been checked. wiring diagram couldnt hurt.
Expert:  Virtual Wrench replied 6 years ago.



It's a pretty basic system and it looks like you have replaced everything in the system, so i would ohm out the wires and check to be sure power is going to and thru the PDC block at that 140 amp fuse. Also the green field wire from the pcm to the gen might be a problem, the pcm "triggers" the field windings in the alt thru this wire.


Click here for diagram


Best wishes!



Customer: replied 6 years ago.
the power (signal) is not coming out of the computer but i have installed the computer in another truck and it worked in that truck so i know that it is not the computer.
Expert:  Virtual Wrench replied 6 years ago.


Is there power at the dk green wire at the alt when in crank mode?

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