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Chevy Blazer GMC Jimmy Electrical Problems

472 messages,  Last post on Nov 19, 2009 at 4:18 PM

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#452 of 472 '00 Jimmy - Something's draining the battery by edortizr6 Oct 27, 2009 (10:17 am)
I think something is draining the battery. I replaced the battery and the alternator but that didn't help. I checked the fuses and they all look ok. I was thinking maybe it's the positive cable on the battery, but I'm not sure. I'm not familiar with the electrical system. I just tried to start the truck and there was power. As soon as I turned the key everything went dead. I'm going to get this battery charged again and take it from there. If anyone has any ideas, I'ld love to here it. Thanks in advance. Replies to this message: Mr_Shiftright (Oct 27, 2009 5:05 pm) jlflemmons (Oct 27, 2009 8:20 pm)
#453 of 472 Parasitic drain by duntov Oct 27, 2009 (3:43 pm)
Parasitic drain can kill a battery in a few days or overnight, depending on how severe the drain is. Bad relays, the ECM, sensors, clock, alarm, and other electronic components can drain a battery if they are not in good working order. For example, I had to replace an older battery when it was compeletely dead overnight because the power door lock relay failed. I replaced the relay and the battery and the new battery seemed to maintain a charge. Just to check the state of charge, I purchased a Beltran 800 ma Battery Minder and attached the leads to the battery positive and negative terminals. I noticed the yellow charge light would come on for 20 minutes before the green full charge light was illuminated but I thought that was normal. My rear passenger side power window was slow at raising and lowering so I decided to replace the power window motor. Replacing the power window lift motor completely fixed the battery drain problem.   Apparently the old power window lift motor was worn so bad that it was placing a small but continuous drain (ground) on the battery even when the engine was not running and the accessory position of the ignition switch was not on. After I replaced the power windlow lift motor, I can reattached the Beltran 800 ma Battery Minder to the battery terminals and the green full charge light is immediately lit. That means the battery remains at full charge indefinately every time I drive my 1991 S10 Blazer 4x4 and turn the ignition key off. I can now leave the Battery Minder disconected for any length of time. When I reconnect the Battery Minder just to see what state of charge the battery is in, the green full charge light lights immediately, meaning the battery is maintaining a full charge while not in use amd does not need the Battery Minder to bring it up to full charge.   That is my story, and it may be your problem, too. I have heard of some vehicle owners pulling accesoory fuses until they find the accessory or accessories that may be causing the the battery drain. Before you start pulling fuses, get a $25 multimeter and see if there is a excessive parasitic battery drain while the engine is not running.
#454 of 472 Parasitic drain by duntov Oct 27, 2009 (3:43 pm)
Parasitic drain can kill a battery in a few days or overnight, depending on how severe the drain is. Bad relays, the ECM, sensors, clock, alarm, and other electronic components can drain a battery if they are not in good working order. For example, I had to replace an older battery when it was compeletely dead overnight because the power door lock relay failed. I replaced the relay and the battery and the new battery seemed to maintain a charge. Just to check the state of charge, I purchased a Beltran 800 ma Battery Minder and attached the leads to the battery positive and negative terminals. I noticed the yellow charge light would come on for 20 minutes before the green full charge light was illuminated but I thought that was normal. My rear passenger side power window was slow at raising and lowering so I decided to replace the power window motor. Replacing the power window lift motor completely fixed the battery drain problem.   Apparently the old power window lift motor was worn so bad that and was placing a small but continuous 5 or 10 ma drain (ground) on the battery even when the motor was not being used and the ignition key was turned off. After I replaced the power windlow lift motor and when I reattached the Beltran 800 ma Battery Minder to the battery terminals, the green full charge light is immediately lit, meaning the battery is at full charge every time I drive the car and turn the ignition key off. I can now leave the Battery Minder disconected for any length of time and when I reconnect it just to see what state of charge the battery is in, the green full charge light lights immediately, meaning the battery is maintaining a full charge while not in use amd does not need the Battery Minder to bring it up to full charge.   That is my story, and it may be your problem, too. I have heard of some people pulling accesoory fuses until they find the accessory or accessories that may be causing the the battery drain. Before you start pulling fuses, get a $25 multimeter and see if there is a parasitic battery drain while the engine is not running.
#455 of 472 Re: '00 Jimmy - Something's draining the battery [edortizr6] by Mr_Shiftright HOST Oct 27, 2009 (5:05 pm)
Replying to: edortizr6 (Oct 27, 2009 10:17 am) Maybe this would help you?   Testing for a Parasitic Drain   This article is about a vehicle with dual batteries but it's all the same.
#456 of 472 Re: '00 Jimmy - Something's draining the battery [edortizr6] by jlflemmons Oct 27, 2009 (8:20 pm)
Replying to: edortizr6 (Oct 27, 2009 10:17 am) Be sure to check that the cables are clean and tight at the battery, and also be sure the ground cable is clean and tight on the other end, usually to the engine block. If you can find a digital voltmeter, check the battery with the engine off. If within 30 minutes the voltage drops more than one tenth of a volt, something is drawing more power than it should. For process of elimination, you can pull fuses and see what stops the voltage drop.   If the car has power until you try to start it, and then all power is gone, double check all your connections to the battery and engine. Here again, a volt meter is invaluable. It will tell you if the battery still has power, but is not getting it to the vehicle, ie bad connection.   Good luck!
#457 of 472 Re: 1992 GMC YUKON WIPER MOTOR HAS HIGH ONLY [buster1155] by cardoc50 Oct 28, 2009 (7:34 am)
Replying to: buster1155 (Oct 26, 2009 5:43 pm) You definately have a short in the wiring somewhere between the fuse panel and the wiper motor assembly. You need a wiring diagram for your vehicle. You can buy a repair manual from your local parts store. In the back of the book you will find the diagrams.I wonder how you went through so many related parts and you never mentioned having a blown fuse.In the diagram you will find the routing of the wiper related wiring. Sometimes the wiring will go through other unrelated parts other than the one you have problems with. I suggest you get the diagram and start from the fuse panel.Sorry I can't pinpoint the exact problem but I hope you may use something I may have said to help you fix your problem. Good luck! Replies to this message: buster1155 (Oct 28, 2009 8:00 am)
#458 of 472 Re: 1992 GMC YUKON WIPER MOTOR HAS HIGH ONLY [cardoc50] by buster1155 Oct 28, 2009 (8:00 am)
Replying to: cardoc50 (Oct 28, 2009 7:34 am) Thanks, I went to dealer ship yesterday and got a print out or wiring harnness and pin pointed wiper wires #91, #92, #93. Talked to his service mgr. and tech went thru problem and steps taken. They were at a loss. I am on my way out to my shop to run the wires down one more time. The guys at dealer ship seem to think that the motor is not grounding and it is searchiing for a ground thru the circuit board. I have one more control board left and i am going to try it now with motor grounded to battery. About the fuse I do not understand that at all it has not blown I even changed thinking something was wrong with it and it has a 25 amp fuse installed. Rear wipers work fine and has a 25 amp in it also.
#459 of 472 2000 Chevy Blazer Electric Locks by cararyarber Oct 28, 2009 (12:29 pm)
Last night my nephew left the back gate on my blazer open all night. It started fine, but when I got to work this morning I tried to lock the doors and nothing..... I checked all the doors and made sure that they were all shut including the gate. Still nothing. Since it was the gate left open I tried to lock all the doors thru that lock. Which worked. So I thought. When I went to my blazer at lunch, all the doors were unlocked again. I checked the back gate, it too was unlocked. I got in the blazer and started down the road and I heard a click. Then the "gate ajar" light came on. Once I got stopped, I tried again to lock all the doors with no luck and the gate ajar light keeps coming on. What do I do?????
#460 of 472 98 Jimmy Trip Odometer problem... by britmarie03 Oct 30, 2009 (4:35 pm)
I have a 98 Jimmy that Ive had for a year. 150k miles, runs like a champ...well since i fixed everything that was wrong. The last week or so, my trip odometer sporatically resets itself when I turn the car off, then restart it again. It always resets itself overnight (again this just started about a week ago), and sometimes resets throughout the day. I truly rely on my trip odometer for gas mileage as the gas guage is always jumping. I have very car knowledgeable friends and they have no clue. My best guess at this point is a short somewhere??? Any helpful tips, hints, or advice of where to start to try to get this fixed would be greatly appreciated!!!   Thanks!
#461 of 472 Underhood fuse box on 97 Jimmy by slarra Nov 15, 2009 (4:25 pm)
I must be an idiot because I cannot find the underhood fuse/relay box on my 1997 GMC Jimmy SLE. There are posts on this forum that refer to it for that model year, and my Chiltons has a picture showing a big, black plastic box sitting atop the driver's side fender. But I don't see that on my Jimmy! Where should I be looking? Replies to this message: cardoc50 (Nov 15, 2009 5:17 pm)

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