Battery voltage jumping to 11.5V
#1
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Battery voltage jumping to 11.5V
Hi!
Few weeks ago I noticed that at idle my battery voltage is jumping. It falls to 12V range or even to 11.5V. When I drive, everything is OK. I know that clutch in my AC compressor is slowly dying, but it should not cause it (i guess). I is happening mostly on high loads (combination of any two or more: low beams, high beams, defogger and AC). When I add wipers then it just stays at 12V range (no jumping). But it also happens with normal power load. I replaced the alternator, swapped the battery for few minutes and the problem did not disappear. I have 2005 EVO with stock audio (no music system).
Few weeks ago I noticed that at idle my battery voltage is jumping. It falls to 12V range or even to 11.5V. When I drive, everything is OK. I know that clutch in my AC compressor is slowly dying, but it should not cause it (i guess). I is happening mostly on high loads (combination of any two or more: low beams, high beams, defogger and AC). When I add wipers then it just stays at 12V range (no jumping). But it also happens with normal power load. I replaced the alternator, swapped the battery for few minutes and the problem did not disappear. I have 2005 EVO with stock audio (no music system).
#3
You might want to get some documentation on what the voltage is supposed to be during different events. I went thru this on a pontiac torrent and found it was perfectly normal. The battery will hold a different charge when ur lights are on, right at start up, and at a few other times. Usually when lights are on it's higher? BUT, that being said I don't think it should ever be below 12? If it is then you have something draining ur car most likely if youve already replaced the alternator and it's still low.
#4
sorry, didn't notice that you replaced the alternator. still something is wrong with wiring (short circuit?) maybe the battery is bad? are you sure the other alternator is good?
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motorspt
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May 18, 2012 02:08 PM