Question about 1995 Chevrolet Blazer

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When I turn key the voltmeter doesn't move but blazer still turns over

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  • toneman2121
    toneman2121 Jun 02, 2010

    the meter indicates at what voltage the battery is charging. you should have your charging system analyzed. some chain automotive stores do this for free, like auotzone and pep boys. it is possible though, the gage is faulty or the circuits for the gage. if there is a battery icon lit on the instrument cluster, i would think the alternator is bad. if not then it's probably only the gage. in any case, have the car checked



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If this truck runs good replace the gauge for it is faulty

Posted on Jun 02, 2010


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A wiring problem or the driver's master switch, probably. Check for broken wires in the harness going into the driver's door opening. A dark green wire is the power wire to the switch (from a 30 amp circuit breaker in the relay block). and a black ground wire from the switch going back into the cabin.
Pull the master switch out and check for power on the dark green wire at the connector, with key on. If no power, wire may be broke from the circuit breaker to the switch, probably in the door opening. If power is good, check the ground circuit from the switch connector to ground. Like this: voltmeter positive lead on the green wire terminal with key on, voltmeter negative lead on the black wire terminal. If voltmeter registers battery voltage, power and ground is good. If no voltage shows on voltmeter, power or ground is bad. Move voltmeter negative lead to a good ground on frame or body. If voltage shows, power is good and ground is lost-look for broken black wire in door opening. Check for the black ground just inside the cabin from door-maybe under the driver's kick panel.
If both power and ground is good to the master switch, try a new or used master switch.

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With a test light or voltmeter. One terminal at the relay would be hot at all times, if I am not mistaken. Or it might need key on to check for power. When key is turned on, there should also be a brief (2 seconds) signal at relay from computer to turn pump on and prime the system, but that signal will stop , and the power feed at relay would still be on.

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I would sugest the problem lies with the ignition switch or barrel if you can't move the key. I would 1st remove the switch from the barrel & turn with screwdriver to see if it operates.

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1 Answer

Hi i am working on 03 gmc sierra it has a battery warning light on .when you put the key in the ignition and turn it to on the voltmeter does not move. if you go to start it . it turn over but does n

Check the voltage coming out of the alternator with engine running it should be 13-15 volts.If its not within these specs then replace the alternator.

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1 Answer


Try turning the steerng wheel back and forth as you turn the key backwards.

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1 Answer

Blazer 1999 won't start got spark new fuel pump

Pull off one injector connector and use a test light or voltmeter to see if one wire has power with key on.
Power to the injectors is fed through the ignition switch, so with key on, you should have power there. The injector ground is inside the ECM. If you have power, you'll have to diagnose the circuit for why computer doesn't ground the circuit when it should.

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1 Answer

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It would help to know exactly what the voltmeter was reading.
Although many US trucks have ammeters instead of voltermeters, which are not as useful.
If you are saying the ignition switch is not causing a heavy draw as one would expect from a starter, then either the ignition switch, neutral safety switch, solenoid, bad engine ground, or dirty battery terminals are reducing current flow. A voltmeter should read 12 volts from the battery when engine is off. Why you try to start, the starter should draw it down do about 10, but then when it starts and you rev it up, it should go over 13.5. If it does not drop to 10, then you have a blockage.

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1 Answer

I cannot remove the key from my 2003 chevy blazer ignition after turning it off. light stays on and drains the battery

Turn the igition to on,then off.Pull on the key while the igition is in the lock position at the same time turn the steering wheel left to right.The steering wheel will move slightly while in the lock position

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