Altinater/ampmeter???? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-27-2001, 09:05 PM
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Altinater/ampmeter????

When I crank my engine the ampmeter reads negative 15 or so and the voltmeter reads about 11 volts. This seems normal to me. But once the engine is runing the they stay at these positions untill I rev. the engine to about 2000 then both needles jump at the same time. The ampmeter goes to positive 10 and the voltage goes to 14 volts. when the engine returns to idle they stay at the new readings.

Is this normal and Does anyone Know why it is happening.

Wilhelm

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post #2 of (permalink) Old 03-27-2001, 09:11 PM
 
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Re: Altinater/ampmeter????

Are the meters you are using part of the Jeep, or external meters? The alternator belt may be lose, the bearings might be hindering the usual readings. There is also the possibility of the diode trio being faulty, and therefore allowing the current to run the wrong way. That one is a really long shot in the dark though. i would check the belt or the gauges first.

Scott Reuben
1979 CJ: 304 3spd, tires, rust, miles
1989 XJ: has seen every state except Hawaii

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post #3 of (permalink) Old 03-28-2001, 07:55 PM
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Re: Altinater/ampmeter????

I don't remember the details because I just glanced over the article I read last week on alternators. The article mentioned single wire alternators which must be "excited" by reving the engine to a certain rpm before it would start charging. My guess, and only a guess would be that whatever component the single wire alternators leave out is malfuntioning on your alternator (or you have one of these single wire alternators). If I find the article I'll provide more info.

89YJ, 350, TH350, 33x12.50 BFG AT/KO, empty wallet
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