SOURCE: Battery Charge
The best way is to get a voltmeter and check the voltage of the battery with the truck running and not running. When the truck is running, the voltage across the battery terminals should be aboput 14.9 volts (showing the alternator is charging the battery). With the truck off, the battery voltage should be about 12 volts (showing that the battery is holding the charge). From there, you should be able to tell which is bad.
SOURCE: battery and alternator charging problem
As dumb as this may sound check the termials and if the u-shape is up then flip it over. I had the same thing happen to me on mine and now it works fine.
SOURCE: The battery went dead. When charging the battery
Disconnect the fuse for the alarm system or unplug horn relay system to change battery if you unplug fuse you will have to reset the alarm, be sure you know how to do this before disconnecting the fuse to the alarm system. Hope this helps.
SOURCE: hello, 2008 hhr, battery went dead,replaced, went
the alternator as got one way diodes in it. charge up the battery and disconnect the negative battery terminal for a few hours etc, put the lead back on , if it starts you need a new alternator, the alternator will of been discharging to earth when not running, good luck.
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