[RichardJ]

05-10-2014
>>I got a -13 in the voltmeter between the negative cable and the negative post on the battery while the truck was running. Is that good?<<

05-12-2014
>>Alright so I did as you suggested except with the truck off and I got a negative 10.5. When I tried it with the truck on the multimeter went crazy <<


I am doing my best to understand what you have been doing. The best I can make of your posts is that you are removing the battery cable from the battery and placing the voltmeter between the battery cable and the battery positive post.

No one here ever told you to do that. No one.

It was suggested you do that with an Ammeter, WITH THE ENGINE OFF. Never with a voltmeter.

NEVER EVER remove the battery cable from the battery when the engine is running on an engine with an alternator charging system. No one told you to do that.