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Chevrolet TrailBlazer Electrical Problems

104 messages,  Last post on Nov 12, 2009 at 1:36 PM

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#74 of 104 Battery goes to 7.0 volts in overnight cold by nutrinoman Mar 04, 2009 (1:02 pm)
When the outside temp goes below 5-10 degrees the battery voltage drops to 6.8-7.2 volts which means absolutely nothing works on the vehicle. 45 days ago I replaced a 2 year old Sears Die Hard Gold series battery (an 8 year battery) with a new one. The problem went away for 45 or so days. Last night the temp went to -2 degrees. This morning, the battery read 7.1 volts. I jumped started it, letting it run for 30 minutes. Now it starts fine. I checked with the Chevy dealer I bought it from and they say it is up to date on all recall notices. They also say they have never heard of this problem. After searching the web I find that hard to believe. Previous posters mentioned corroded computer connections. Where is this computer located?   In addition to the battery issue, I have another with the front passenger door electrical system. Sometimes all the electrical stuff works fine and other times nothing works, mirror adjustment, switch lights, window, and lock. If any work then they all work. I can drive during the night and watch the lights on the switches turn on and off. It looks like a connector problem but I can't find one that seems to cause the problem.   Any ideas for either of the problems would be greatly appreciated. Replies to this message: burdawg (Mar 05, 2009 12:24 pm) nutrinoman (Mar 05, 2009 1:22 pm) nutrinoman (Apr 03, 2009 3:40 pm)
#75 of 104 Re: Battery goes to 7.0 volts in overnight cold [nutrinoman] by burdawg Mar 05, 2009 (12:24 pm)
Replying to: nutrinoman (Mar 04, 2009 1:02 pm) During the 45 days the problem went away, did the temperature drop below the 5-10 degree point at any time? I think I would do this, but it depends on your personal level of ability: The next time low temps are expected overnight, disconnect the battery. If the battery charge stays up then you have a pretty good idea that the battery is OK. If that's the case then I would suspect some system in the vehicle is turning on when the temperature drops down, or some component is being effected by the cold causing a load on the battery. Under these conditions you could verify it by measuring the resistance across the battery cables. It should be quite high. That's going to be very hard to diagnose, since it only occurs during cold weather. If after the battery colds soaks overnight the charge is low (assuming the charge was good before the cold soak), then the battery is likely weak. You need to keep something in mind, just because a battery is new or has a good warranty, that doesn't mean the battery won't fail. Batteries today are shipped wet, which means that they start aging the day they are filled with electrolyte. If they sit around on a shelf for a long while, they may be already old when you get them. Replies to this message: nutrinoman (Mar 05, 2009 1:22 pm) nutrinoman (Apr 03, 2009 3:40 pm)
#76 of 104 Re: Battery goes to 7.0 volts in overnight cold [burdawg] by nutrinoman Mar 05, 2009 (1:22 pm)
Replying to: burdawg (Mar 05, 2009 12:24 pm) Thanks for the reply. I had not thought of disconnecting the battery. Unfortunately, sort of, it is not supposed to drop below 10 degrees for the next week, maybe not until next winter.Thanks also for the info on the battery warranties. I just assumed that the statement that battery was good for eight years was truthful. I should have remembered caveat emptor. Replies to this message: nutrinoman (Apr 03, 2009 3:40 pm)
#77 of 104 Electrical Problems--Battery or Alternator or what? by triumph57 Mar 15, 2009 (9:16 pm)
My 04 TB just developed a stange electrical starting situation. The battery does not have the power to start the vehicle, but the battery tests just fine. I was thinking that ti could be the alternator, but now the battery will not hold a charge when I have charged it--the volt meter shows as low as 9 volts after charging The interesting twist to all this is---If I just try to start it normally, it won't start--not enough battery power, the gauges go all the way to far left and the clock on the radio resets to 12:00. On the other hand, if I quickly just barely turn the the key in the ignition swith to start and release it, somehow the ignition system sems to dig deep for enough battery power to actually get the vehicle started. The gauges all go full left and the clock still resets, but the vehicle starts--something it won't do if I hold the switch in the start position. I am baffled after reading some of the posts here but am hopeful someone can shed some light on this problem.
#78 of 104 Re: Headlights and Dash lights [sharv10] by mrfryan Apr 03, 2009 (11:33 am)
Replying to: sharv10 (Feb 17, 2009 7:21 am) I also have an '05 TrailBlazer that just started the same thing. Only when I start it in the morning and when I leave work (After it's been sitting for awhile). The last few days have been damp too. I had the Alternator and the Battery checked and they were both fine. Please let me know if anyone has a solution!!!
#79 of 104 Re: Battery goes to 7.0 volts in overnight cold [nutrinoman] by nutrinoman Apr 03, 2009 (3:40 pm)
Replying to: nutrinoman (Mar 05, 2009 1:22 pm) Just an update. It turns out the problem is not temperature related. I have had the voltage drop overnight a few times when the temp stayed at or above freezing. I have not yet found the problem. One side note to this though... If I put my old Sears battery charger on it for only a couple of minutes I can start the car without problems. When this happens I can watch the in-dash meter go to about 7 volts, hover there for 5 or so seconds then jump right up to its normal position of 14 volts.
#80 of 104 I need help by itago May 08, 2009 (2:48 pm)
I am not sure what the problem is but I took it in for a diagnostic and they told me that the BCA need further diagnostic service. But my main complain is that I had changed the ignition fuse for about 8 times noa and it blows out everytime I drive for more than 20 miles or so. I really need help. I was told by the mechanic that did the original diagnosis to take it to a chevy dealer but I want to know first how much it will cost to fix something like this.
#81 of 104 2006 Chevrolet Trailblazer EXT LS problems by seah1018 Jun 02, 2009 (9:35 am)
I have a 2006 Chevy Trailblazer EXT LS with 65000 miles on it. The car has recently started acting up electrically, I think. When ever I turn on the air conditioner a set of warning lights comes on and the dash starts beeping. The lights that come on are the emergency brake light, the ABS, the Traction control and the 4 wheel drive train, the air conditioner will not blow except in the back. If I turn the a/c all the way to level 5 the warning lights will not come on but I can not put it any lower than 5. Yesterday I tried just having the rear air on rear control and the same thing happened, the lights came on and the beeping began. This has been happening off and on for a few weeks, never with the rear air control until yesterday. Does anyone have any suggestions? I tried unplugging the battery for 20 min to reset the fuse but the problem persists. Thanks
#82 of 104 Battery goes to 7.0 volts by ajscott19 Jun 22, 2009 (10:04 am)
I have a 2005 Trailblazer and about 9 months after I bought it I was driving at night and my volt meter dropped causing my dash lights, head lights and tail lights to flash like a strobe light. After it started it seemed that every other day it was doing it and would not stop until I pulled over and re started it. I took it to the dealer I bought it from and they replaced the altenator, a week after it was replaced the same problem occured so I brought it back and they couldn't find anything wrong with it. As soon as I left the dealer it starts doing it again. I decide to take it to another chevy service and they replace the altenator again (I told them that this was already done) A week after I pick it up it starts again so I take it back and they replace the ground fault wire. Again after I pick it up it happens and they tell me they can't duplicate the problem (yeah right) By this time I am so frustrated I write chevy and explain everything in which they set me up an appt. at a chevy dealer which is for tomorrow. We'll see how that goes, but I hate my trailblazer and will never buy one in the future. Has anyone else had this problem that they figured out what was causing it? Replies to this message: mrfryan (Jun 23, 2009 5:51 am) ajscott19 (Jun 30, 2009 6:09 am) bainms (Nov 03, 2009 8:05 am) tmirgliotta (Nov 04, 2009 3:45 pm)
#83 of 104 Re: Battery goes to 7.0 volts [ajscott19] by mrfryan Jun 23, 2009 (5:51 am)
Replying to: ajscott19 (Jun 22, 2009 10:04 am) It sounds like you have the same or similar problem as mine. Mine is the secondary air injection pump for the exhaust. My check engine light came on and it read the code for the secondary air system. I replaced the check valve and all was well for about a month. Then my check engine light came back on and my truck started randomly doing what you explained. The Volts would fluctuate back and forth and in the mean time the lights was dim like a strobe light. It would only do it for about a minute and then it'd stop. Turns out the after I replaced the check valve, the actual electronic pump went bad and was causing a drain on the system. They only want some $400 to replace it!!!!!!!!! The dealership said that it shouldn't affect performance of the car, it's just to disperse the pollutants in the exhaust. So instead of replacing the pump, I just pulled the relay for it and all is well (except my check engine light is always on).   I love my trailblazer... even with it's little quirk.   I hope that helps and you figure out what's wrong with yours! Replies to this message: ajscott19 (Jun 30, 2009 6:09 am)

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