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New alternator will not charge battery
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1eyedroller
New User
Nov 7, 2009, 10:24 AM
Post #1 of 2
(2904 views)
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New alternator will not charge battery
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I have a 1998 dodge 5.9L 1 ton 3500 2wd van, with 106,000 miles on it. When the volt meter indicated that the battery was not charging I checked the battery found a dead cell and put in a new oem battery. When this didn't solve the problem I replaced the alternator. The charging system worked for a short time then quit again. The voltage is regulated by the on board computer. I have checked the alternator and tried several new ones but no change. Could the on board computer need to be changed. I am reluctant to keep throwing money at this problem based on guesses. Any help or suggestions would be greatly appreciated thanks.
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DanD
Veteran
/ Moderator
Nov 9, 2009, 6:20 AM
Post #2 of 2
(2884 views)
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Re: New alternator will not charge battery
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Disconnect the plug-in terminal at the alternator; connect a test light across the green and orange wires in the connector. Start the engine and the test light should light after about a two or three second delay. If not then the problem is likely in the computer or the wiring between the computer & the alternator. To confirm which you would need to again connect a test light between the orange and green wire terminals at the computer. If the test light still doesn’t light; then the problem is inside the computer, as long as the computer is receiving all of its inputs.
Make sure all fuses are tested with a test light; that will confirm that there is continuity through them.
Dan.
Canadian "EH"
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