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whitedog76 · 12-07-2016, 01:15 PM

My 04 Trail blazer is having issues.

The battery is draining overnight. If I jump it and let it run, alternator charges. Battery holds charge, if I unhook it.

There is a little arc when I unhook battery, but that's normal. The multimeter doesn't show any measure able amount of current when I hook it between batt. Cable and battery.

After I jumped it the one time, I was getting 14.5 volts, then it would drop to 6-7 and then back to 14. I'm assuming this is normal, since battery was discharged.

I'm guessing there is a bad diode in alternator, but don't want to replace parts un-needed.

12-07-2016, 01:15 PM	#1
whitedog76 Registered User Join Date: Jan 2014 Location: Peoria, IL Posts: 1,450	Charging issues My 04 Trail blazer is having issues. The battery is draining overnight. If I jump it and let it run, alternator charges. Battery holds charge, if I unhook it. There is a little arc when I unhook battery, but that's normal. The multimeter doesn't show any measure able amount of current when I hook it between batt. Cable and battery. After I jumped it the one time, I was getting 14.5 volts, then it would drop to 6-7 and then back to 14. I'm assuming this is normal, since battery was discharged. I'm guessing there is a bad diode in alternator, but don't want to replace parts un-needed.