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<blockquote data-quote="TurdFergueson2" data-source="post: 6383743" data-attributes="member: 579108">I got my alt installed Friday and when it was first hooked up, I got a 14.2 reading. My mechanic drove it home about 5 blocks while I trailed and it was still fine.I got in maybe 10 minutes later to give it the test. I popped the face on my radio which displays the voltage and it was still 14.2. I took off around the corner and gave the car a little gas and around 40 mph the voltage suddenly dropped to 12.7 and slowly dipping lower. Battery light popped on too.Yesterday was rainy so I didn&#039;t mess with it. Today I tried a few things none of which worked. I put my DMM on the alt and it reads 12.3 (same as batteries)I&#039;m not sure what else I can try. My trusty stock alt was giving me a 13.5-13.9 reading when it was taken off. I swapped it because I am running 3k+ watts and may do more.Does this sound like a bad alternator? All of my connections are tight, the belt is not slipping and it did work for all of like 15 minutes.Car is a 2000 Chrysler 300M. I&#039;m not sure if there is a fuse or something that I can check. I just don&#039;t want to go through the trouble of having it taken off and put back on if something else can be tried first.</blockquote>

[QUOTE="TurdFergueson2, post: 6383743, member: 579108"] I got my alt installed Friday and when it was first hooked up, I got a 14.2 reading. My mechanic drove it home about 5 blocks while I trailed and it was still fine. I got in maybe 10 minutes later to give it the test. I popped the face on my radio which displays the voltage and it was still 14.2. I took off around the corner and gave the car a little gas and around 40 mph the voltage suddenly dropped to 12.7 and slowly dipping lower. Battery light popped on too. Yesterday was rainy so I didn't mess with it. Today I tried a few things none of which worked. I put my DMM on the alt and it reads 12.3 (same as batteries) I'm not sure what else I can try. My trusty stock alt was giving me a 13.5-13.9 reading when it was taken off. I swapped it because I am running 3k+ watts and may do more. Does this sound like a bad alternator? All of my connections are tight, the belt is not slipping and it did work for all of like 15 minutes. Car is a 2000 Chrysler 300M. I'm not sure if there is a fuse or something that I can check. I just don't want to go through the trouble of having it taken off and put back on if something else can be tried first. [/QUOTE]

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