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Chevy Blazer GMC Jimmy Electrical Problems



  • bitterbitter Posts: 22
    Perhaps it was the fuel pump relay switch that was causing the initial problem? Not sure if the ignition switch will do that, (cancel the signal to the pump). When you say, wont start, is that, it's turning over but wont catch or start. Or, it won't say anything when you turn the key? Those ignition switches make them do strange things. Are the lights in your dash coming on when you turn the key? Do you hear the fuel pump spool up when you turn the key? Can you spray starting fluid in the throttle body when this is happening and it starts momentarily? So, many questions. How long has it been since the fuel pump was replaced? Was it a OEM (Delphi) replacement or one of the ones you have to splice and match-up color code wire sequences?
  • bitterbitter Posts: 22
    Sometimes the flasher switch on the steering column does crazy things. I believe if you locate your flasher switch, which is under the dash. If it is a 2dr, it may be located in the console. Listen for it for a while and then pin point the area of that sound. You may have to place your head near the brake pedal to get a good bead on the sound. The flasher relay is usually shiny silver in color. If you put your hand on it, you can definitely feel it clicking. Push the flasher button on and off a few times. I have a 97 and this worked. Mine made the clicking sound but the lights did not light up on the dash. Weird. It was only a few months old when this happened. The electronics on these vehicles are second class.
    Good Luck
  • bitterbitter Posts: 22
    This problem is definitely related to your ignition switch. Not to be confused with the key hole on the steering column! The ignition switch in this case, is the series of wires that are indeed located in your steering column that run to the fuse block of the vehicle under the dash. 3 yrs ago it cost 90 bucks @ Advance Auto. Not real hard to replace, but not real easy either. I was told that you had to remove the steering column. I did not. Going to need a few small special tools. Star sockets, male and female, if my memory serves me correctly. I was mislead on several occasions to the relay switches under the hood and behind the clove box. Strangely enough when this was going on, I could indeed tap the middle relay and things seemed to right themselves momentarily. Save yourself the headache and change the IGNITION SWITCH!
  • Thank-you Bitter we changed it today and everything is working great =) haven't checked to see if transmission codes are gone yet but engine light is finally off and things are shifting ok again =)
  • cluckerclucker Posts: 3
    My Blazer normaly starts with just the mimimun cranking power and your off. After driving for 10 miles or so. stop and restart the key sounds hesistant and than starts. Like no voltage. Continue for another 10 miles while watching the amp gage and it sitting at 11 to 12 volts no fluctuation. Normally it sits at 13 -14 volts with the air runing and at 100 degrees the air is runing. When I return home pulled in the driveway and turn the motor off. I tried to restart and the battery appeared dead with no cranking power at all Radio. Left it until the next day to work on it and tried to crank it and it started immediately 5 or 6 times in a roll. Puzzle now. Can the heat cause the alt or the battery to open? any help would be appreciated.
  • Hi, can anyone explain or provide a diagram on how to replace the ignition module inside the steering column. Tried B4 but could not see. It seems as though when the column is tilted up it doesnt work. I saw that there was a gear type device that was out of sink. Fixed that but still has a problem. Cant see where the module is. Thanks
  • ohioracerohioracer Posts: 1
    edited August 2010
    i have a 99 blazer. my gf got on the brakes hard a coulpe weeks ago and from then on it has not been right. when the abs light is on it is fine but if the abs light is not on everytime i hit the brakes the abs kicks in and the truck doesn't want to stop. i changed the wheel speed sensors on passenger and driver's side and it is still doing it. got any idea before i throw anymore money away??? the abs is only kicking in when i get slowed down to about 5-10 mph
  • A new starter was installed in our '96 Chevy Blazer but there is no power going to the starter. I was told to look for an inline fuse for the solenoid/thermal wiring? The starter clicks and there is action in the relay. Any ideas? All the fuses in the fuse box are okay.
  • Your solinoid is kicking in but,The starter is getting no power at the main battery connection. Either the starter is bad or when the positive cable was bolted on,that connection would'nt work if you did'nt hold the bolt with a wrench when you tightened up the main wire. This lets it twist inside the starter and break the main connection in the starter. p.s. how's your battery terminals?
  • htaphtap Posts: 1
    I need help! I have a 99 blazer. My problems, power locks keep blowing the 15 amp fuse and the power windows work for a second and then stop. I turn the truck off wait a minute and start it and the windows move a little more and then stop. Any Ideas be for I torch it. :mad:
  • I have a 2000 Blazer that all of a sudden has developed electrical issues. The brake lights are on if the engine is running, the right blinker has stopped working, and if you keep your foot on the brake the engine keeps running even with the key out. If you step on the brakes the radio, headlights, basically the accessories all come on without the ignition on and the odometer, speedometer, transmission position indicator, fuel and temp gauges stopped working. All of the above happened at the same time. The truck was being driven when the engine died of a sudden, The engine started right back up with the problems above. Anyone have any idea's on what could cause this?
  • You're gonna love this....I put a bullet through the dash of my 99 Jimmy SLT. Bullet penetrated to right of steering column just under the various buttons such as rear hatch, rear wiper, and the 4WD buttons. Bullet penetrated the steel engine fire wall, hit a metal cylinder (of sorts with plenty of wires out of has a small dent on the back side) located in the middle of the engine compatment against the fire wall. I can't tell if there's other damage in the engine compartment. Initially , I didn't see any problems with any operations. Today, I tried to use the following features and they now don't work (interesting that all these buttons are located just above the bullet hole): Front and rear wipers, rear wiper fluid, rear hatch, can't get out of 2HI (lights just flash). So far, everything else seems to work. I haven't taken all the dash/instrument panel apart. What did I break? What is that cylinder thing mounted to the firewall that now has a small bullet dent in it (one end is a cylinder connected to a box with wires)? Are there a bunch of wires or circuit boards under that dash that I could have hit? Any pictures or schematics to look at on the internet that will help me to pull the dash apart?

    Yep, I could have hurt myself bad and I was pretty angry with myself. Needless to say, I'm handling my rifle a lot more safely now when it's 5AM and I'm off to the hunt.
  • tidestertidester Posts: 10,110
    I'm not sure what you broke but this may be helpful in the future. :)

    tidester, host
    SUVs and Smart Shopper
  • On my 97 Jimmy, the controls are in a different place.Every year from 95 to 04 the wireing and controls seem to be in a different place or different in some manner.I can only recomend looking closely under the hood for any obvious problems then remove the 2 screws under the top of the instument panel just above the guages
    then unsnapping the outer section of the instument panel.(again,that's the way mine comes off yours may be different) and remove it.Any obvious damage should be visible.Check your fuses, relays and wireing as best you can. You can buy a manual at your local parts store which should help identify the cylinder under the hood and so forth. I was thinking the a/c dryer but it does'nt have but a couple wires coming from it.Good luck and I'll say there's been quite a few times I'd like to put a bullet through my Jimmy too! LOL :mad:
  • i just got a blazer and the wires for the 4x4 switch were pulled out of the plug...
    can any one tell me the order they go back in the plug?
  • Same thing is going on with our Blazer. Did you find a fix?
  • I'm not sure that I have a total fix but I replace my ground cable to the chassis and cleaned up the terminals of the battery. Problem has not returned but the weather is considerably cooler so I'm not using my air now to duplicate my problem. Hope this is helpful but I only drive my vehicle maybe 25 miles a month. It's a second car that only gets used about every other week on weekends. Good luck
  • i've got a 98 chevy blazer 4x4, thing has gone crazy. when the key is completely turned off all the gauge lights stay on, when car is turned on the gauge light still stay on an some times blink repeatedly for a little while. the speedometer works fine, but the rpm will work almost never it either sits on 0 or jumps back in forth like crazy. also the radio works an comes on but no sound, its the original an i tried taking another original an putting it in, it came on but still no sound but car still runs great all fuses are good. anybody had the same problem or can help me out???? its been this way for about a year!!!!
  • I have a 1998 chevy blazer all of a sudden my I cant get my 4x4 to engage, when I press the button 4 hi or 4 lo it lights up and I hear it clicking on. I have checked all the obvious fuses and I am getting voltage to the transfer case. At this point I am inclined to believe that there is a vacuum leak or disconnected hose somewhere because at the same time that this problem occurred, my heater slide control will only blow out of the vents no matter where I position the slide control :confuse:
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