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Old 06-04-2009, 07:41 PM   #1
alarmer
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Default new battery, new alternator...still have battery icon light???

2000 lw1 with 2.2 four. Battery light started coming on for short period of time yesterday, then off and on till it was on all the time. replaced battery (was far from home) hoping that was it....found out with multimeter alt. not charging.
replaced that with Remy rebuilt and still have battery icon warning light.

new alt. putting out 13.5vdc new battery (ign off) at 12.5

checked: engine ground...good
battery cables...no corrosion so i took them off battery and cleaned them. (also wire brushed ground to chassis next to battery).

fuses??? checked just the ones under the hood, but read the owners manual which didn't list any for the charging system. Did i miss one not listed 'charging system'?
I metered the power directly off the new alternator (engine off) to find 12.5vdc which i was told it should be.

What am i missing? does the system require more voltage than what i have? Is there a fuseable link or something I don't know about?

The only thing i didn't do is wire brush where the battery cables connect to the engine (hard to get at), but they didn't seem corroded.

Thanks for any help!
Bruce

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Old 06-04-2009, 09:19 PM   #2
fdryer
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2003 L-Series 3.0L Sedan
Default Re: new battery, new alternator...still have battery icon light???

Battery voltage should be around 12.5v while the alternator should output around 13.5v+ at idle and 14.3v+ above idle, provided the serpentine belt is taut and not slipping. There is a fusible link wire running between the alternator and the same connection it shares with the battery cable on the starter solenoid's outside terminal. This fusible link resembles a wire but is gauged to melt if current exceeds it rated capacity. A melted link may not be visible so testing for voltage at the alternator connection should either light up a 12v test lamp or read battery voltage. This fusible link is sometimes mistakenly separated from the battery cable connection on the same starter solenoid terminal. Be sure of its connections and voltage. Voltage missing on the alternator end of the fusible link means a blown link and replacement necessary. Overtightening the connection on the alternator post sometimes breaks the wiring inside the alternator, resulting in the same open circuit back to the battery and requiring another alternator. This fusible link provides the alternator a path to charge the battery and supply the electrical system all its needs.

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Old 06-07-2009, 12:14 PM   #3
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Default Re: new battery, new alternator...still have battery icon light???

Check the wire on the back of the Alt and make sure it is not rubbing against any AC lines or any metal, it can chafe and ground out and cause the light to come on.

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