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  #1  
Old September 26th, 2013, 12:30 AM
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Frank Rafka
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Strange electrical problem...

This is weird, got my 110 back on the road and the battery light in the binnacle would start out dim, like low voltage, then got brighter as the rev's come up, then blew the lamp...Alternator is putting out 12.2 volt at idle, which is what it's always been it's output (replaced the alternator when I got it)...haven't had a chance to dig into it but was wondering if anybody else has had something like this happen...
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  #2  
Old September 26th, 2013, 12:45 AM
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Quote:
Originally Posted by mongosd2 View Post
This is weird, got my 110 back on the road and the battery light in the binnacle would start out dim, like low voltage, then got brighter as the rev's come up, then blew the lamp...Alternator is putting out 12.2 volt at idle, which is what it's always been it's output (replaced the alternator when I got it)...haven't had a chance to dig into it but was wondering if anybody else has had something like this happen...
I think your new alternator was bad from the get go. It should put out 14v. Replace the lamp too (I think it is in the charge system).
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  #3  
Old September 26th, 2013, 08:38 AM
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Mike
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As mentioned above sounds like the Alt is not putting out enough. Is the belt tight? What is the condition of the belt? Have you checked the grounds?
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  #4  
Old September 26th, 2013, 10:39 AM
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Frank Rafka
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Checking all that this morning...
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  #5  
Old September 26th, 2013, 10:46 AM
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What engine?
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  #6  
Old September 26th, 2013, 01:33 PM
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Frank Rafka
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sorry...200tdi
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  #7  
Old September 26th, 2013, 02:17 PM
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Ah good, at least I know something about 200tdi's now.

Are you entirely sure that your alternator's battery sense wire is connected to your battery's positive terminal in the "key run" position?

The rectified output of the 200tdi alternator should be greater than 14V at idle.

The fact that the voltage at idle is 12.2V makes me think that the battery sense wire is disconnected. When the battery sense wire is disconnected from the battery, the rectifier-regulator will be unable to determine the output voltage and may be causing unregulated voltage to be sent to your battery indicator, causing it to blow at high rpms.

The bigger issue here is that your battery is probably not charging properly at the moment.
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  #8  
Old September 26th, 2013, 10:31 PM
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Frank Rafka
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So the alternator is putting out 13.9 at idle, but increases as the rev climbs...looks like it's shot
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  #9  
Old September 28th, 2013, 10:46 PM
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Julien Dalbin
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13.9 is acceptable, should be around 14.4 V but 13.9 will charge your battery. Each time I had lower voltage issue it was diode related.
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  #10  
Old September 28th, 2013, 11:04 PM
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Frank Rafka
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it's the alternator...voltage regulator is shot...got another on the way
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