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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2010 Posts: 15 New Guy | | New Guy Joined: Sep 2010 Posts: 15 | The truck is a 250 six cylinder. The light stays on all the time. I have replaced the voltage regulator, and the alternator was checked to see if it is charging, and it is putting out close to 14 volts. I replaced the plug on the back of the alternator, due to a broken wire, I thought that might have been the problem, but it did not change. The light does not flicker, off & on, it just stays on all the time. Anybody have any ideas, what is wrong? | | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | If the wiring is intact, the light usually indicates a bad diode on alternator equipped trucks,
Scott | | | | | Joined: Dec 2011 Posts: 7 New Guy | | New Guy Joined: Dec 2011 Posts: 7 | If its a generator did you polerize the regulator or if it a alternator you might have a week cell in the battery and its stuck in the charge mode. Just some ideas for thought. | | | | | Joined: Sep 2010 Posts: 15 New Guy | | New Guy Joined: Sep 2010 Posts: 15 | When I originally had it checked, the machine said, that it was the regulator. As I stated, I put a new regulator on & replaced the plug in on the alternator, checked all of the connections and it still stays on. I suppose, that even though the alternator is charging, there might be something wrong internally with it. I did not have the battery checked, but maybe I need to do that also. Thanks for the input. | | | | | Joined: Feb 2004 Posts: 29,836 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,836 | You need to do a better checkout of the alternator function. It's possible for an alternator with a bad rectifier diode to have enough voltage to charge the battery, but at a very low current output. For instance, a 65 amp alternator with one bad diode will charge at about 10-12 amps. Have someone check out the maximum amperage output as well as the voltage.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Sep 2010 Posts: 15 New Guy | | New Guy Joined: Sep 2010 Posts: 15 | Thanks, I will have it looked at. | | |
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