Charging problems

40

Asked by Apr 30, 2015 at 10:44 PM about the 2001 Honda Civic EX

Question type: General

Replaced alternator and battery charging is only around 9 to 10 volt from alternator to
battery when the engine is reved up volts drop. And if head lamps are turned on it dies.
With engine running with battery terminal off still only 9 to v's from battery. And battery
only 9 to 10 v's got to boost every time. This is alternator #2 and battery #2 why would
volts be so low. ? Has new terminals.

3 Answers

68,245

Hate to say this,but it is another bad alternator,alternator should push,13.5 amps and your battery should have a constant 12 volt,s,if you keep having and issue of burning up alternator,s,you may need to have the cable,s and wire,s ohmed to make sure there are no break,s in them.

40

I did check the ground the ohms were good. Was wandering about the starter because was thinking even at 10 volts it would do more than just click like it was very low. What's your thought on that?

100,255

Check to see if yours is a Honda Dual Mode charging system, if it is the fault could be in the ECM not turning on the high mode just after starting then switching to low mode when battery reaches acceptable voltage. There have been known faults with the ELD unit having poor solder connections. This of course is assuming that all of the main voltage connections are clean and in good repair and the ground pathways are also good. FYI. Never disconnect the battery with the engine running, doing so causes a voltage spike that can destroy electronics. I had a customer that did that on a Crown Vic and by the time we had fixed everything that was fried it cost him 1500 bucks.

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