Battery light on
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
Get one of these and see what it says under various rpm conditions. This will help with possible causes and solutions.
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Senior User
Joined: Jul 2014
Posts: 435
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From: Bloomfield, NM
03. The old alternator was charging but the regulator wasn't upping the output when the load increased. Threw a meter on it while it was running and added to the load little by little and watched battery voltage drop and the alternator output stayed constant. Changed the alternator and had them bench test the old one and sure enough it failed
Posting Guru
Joined: Oct 2008
Posts: 1,080
Likes: 10
03. The old alternator was charging but the regulator wasn't upping the output when the load increased. Threw a meter on it while it was running and added to the load little by little and watched battery voltage drop and the alternator output stayed constant. Changed the alternator and had them bench test the old one and sure enough it failed
* On 03 there is a resistor in the panel which is nor serviceable. There are after market shops that will repair it for you if that were your problem.
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mcastleberg
Electrical Systems/Wiring
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Dec 10, 2003 10:58 PM
