Quote:
Originally Posted by dabenthusiast
Sorry to see argument on this post.
This morning I am going to get the x5 towed to my house. I tested at terminals yesterday and got a 10v read.
When I get it to my house I will charge it and take it and measure volts again.
After that go to autozone and check it.
After that remove alternator and take it to get checked..
Not buying any parts until late I do get my car at my house because it's to hard to do test in another city without my garage.
Alot of the info has helped me.
I'll get back once my car is at my house and battery has charged.
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No arguments, just people that do not understand or want to understand!
10 Volts at the battery or where every you measured is BAD.
A fully charged 12 Volt battery should have a terminal Voltage of 12.6 Volts.
Just because the batter has 12.6 Volts does not mean it is a good battery.
A battery can have a surface charge that is greater than 12.6 Volts, but this can quickly be removed by turning the headlights on for 30-60 seconds, then let the battery rest.
Until a battery is properly charged and tested, you have no idea what shape it is in.
Problems as mentioned, could be with loose or corroded terminals, a bad BST cable and even a bad alternator.
Keep in mind that some of these vehicles also have bad engine to body grounds as well.
If you have a battery charger that claims the battery is 100% charged, you cannot use this 100% value to consider the battery any good. The battery needs to be tested with a load tester and/or a resistive/capacitive battery tester. I prefer both.
A poor mans load test is to monitor the battery terminal Voltage on a fully charged batter, turn the headlights on and if the battery drops below 12.2 Volts, I would likely condemn the battery, but always best to have a proper test preformed.