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re: Help diagnose engine trouble (pretty sure it's alternator)
Posted on 8/23/17 at 1:44 pm to Sparkplug#1
Posted on 8/23/17 at 1:44 pm to Sparkplug#1
Alternator. The truck should keep idling for a bit if it was working properly after you disconnected the battery. (Well in the old days that was a valid test, not sure how the computers respond to that type of test now)
Another test is get a multi-meter and test your battery voltage while it is idling. It should be around 13.9 to 14.2 while idling if the alternator is charging correctly. Then kill the truck, check the battery a few minutes later, if the surface charge is below 13.5 and is dropping rapidly below 12V, then the alternator is not charging he battery correctly.
However everything you have said so far indicates a bad alternator at this point.
Another test is get a multi-meter and test your battery voltage while it is idling. It should be around 13.9 to 14.2 while idling if the alternator is charging correctly. Then kill the truck, check the battery a few minutes later, if the surface charge is below 13.5 and is dropping rapidly below 12V, then the alternator is not charging he battery correctly.
However everything you have said so far indicates a bad alternator at this point.
This post was edited on 8/23/17 at 1:49 pm
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