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2000 peterbilt 378

Replaced starter...now when started voltmeter shows 12 instead of 14...and when you turn lights on...radio goes off and voltmeter drops to 10..

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  • 53 Answers

Sounds like the Alternator is NOT working.
Get it checked by an Auto-Electrician.

Posted on Apr 21, 2014

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Depending on the output of your alternator, and the rpm range of your idle. will determine how much and how fast the alternator works to charge your batteries.

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My mom has the same problem w battery w. chrysler 300m(2002) she allready replace w. new battey then chrysler service dept. told her the battery was fine n replace her starter now electric shop says it is...


Sounds like alternator if the battery is not staying charged or the output from alternator the big red wire is lost connection to battery +.
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if the battery is low it should show 14.7 volts if it shows 12 volts or less with lights heater etc running then alternator is not charging.
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Do you hear a fairly loud 'click' when you try to start? That should be the solenoid for the starter that is trying to work. You need a test light or voltmeter to check what is happening to the starter itself. When the solenoid clicks, it is pulling a very heavy electrical contact closed which applies 12 volt power to the starter motor. Check the large terminal on the solenoid that has the + battery cable attached--the test light should light before and during any attempt to start (the meter should indicate 12 volts). If the light goes out during the start attempt, clean the battery terminals and check the condition of both cables. If still no start, test the starter side terminal of the solenoid--the light should come on only when start is attempted. If it does, the starter is bad. If you get no light at all, the solenoid is bad. If the battery negative cable is connected to the car body, check for a broken or loose cable that runs from the car body over to the engine. Hope this helps!

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