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Wiring, Electrical & Installation
New Alt Still voltage drops!
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<blockquote data-quote="MadAudio" data-source="post: 1744592" data-attributes="member: 560581"><p>first off is the voltage drop happening while the car is in idle?</p><p></p><p>if it is then thats normal most high out alts dont put out rated till higher rpms</p><p></p><p>second hmm 13.9 is kind of low for a alt i think. should be 14.2 or better might need to change the pully.</p><p></p><p>the reason why the battery was suggested is your car battery acts as a buffer juice goes from alt to bat to system the greater your battery ability to maintain a 12v drain the less voltage drop you will have from the drain that 13.9 charge might indicate a low charged bat ( needs to be charged) , bad battery or loose belt .try it again only this time when the light comes on rev the engine a little say 1500-2000 rpm see if the light goes away then you know it has something to do with the alt's rpm either loose belt or you need to change pulley</p></blockquote><p></p>
[QUOTE="MadAudio, post: 1744592, member: 560581"] first off is the voltage drop happening while the car is in idle? if it is then thats normal most high out alts dont put out rated till higher rpms second hmm 13.9 is kind of low for a alt i think. should be 14.2 or better might need to change the pully. the reason why the battery was suggested is your car battery acts as a buffer juice goes from alt to bat to system the greater your battery ability to maintain a 12v drain the less voltage drop you will have from the drain that 13.9 charge might indicate a low charged bat ( needs to be charged) , bad battery or loose belt .try it again only this time when the light comes on rev the engine a little say 1500-2000 rpm see if the light goes away then you know it has something to do with the alt's rpm either loose belt or you need to change pulley [/QUOTE]
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New Alt Still voltage drops!
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