Question about 2003 Chevrolet Silverado 1500

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03 silverado turn the key to start but starter will not engage

I have replaced the starter relay and the ign. switch but when you turn the key on everything comes on like it should but the starter will not engage i have opened the door and cloed it and the truck would then start

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  • bigjune2003 Jan 08, 2009

    i do not have a security system the only thing mine has is a little red light tha flashes right beside my radio

  • Anonymous Apr 28, 2009

    same prblem i do not have a security system

  • Anonymous Apr 28, 2009

    starter will not engage

  • yadayada
    yadayada May 11, 2010

    do u have a securitry system?

  • Anonymous Mar 12, 2014

    key turns and lights engage but no engine/starter engagement

  • Anonymous Mar 30, 2014

    electrical seems okay

  • Anonymous Mar 31, 2014

    motor will not turn over

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Interesting problem, on the starter is a "trigger" wire that originates from the ignition (may run to the power distribution center). When the truck is started 12 volts runs down that wire and activates the solinoid on the starter. Put a 12 volt test light on the trigger wire by the starter, have someone hit the key to start, test light should come on, if not chase wire back and look for a break in the wire or replace trigger wire.

Posted on Jan 09, 2009

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Posted on Jan 02, 2017

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Is the anti-theft light lit on the instrument cluster ? Won't start how ? When you turn the key to start , what happens ? Nothing ? This would be a No crank - no start condition . Now if you turn the key to start and the starter engages and spins the engine and it doesn't start an run , this is a engine cranks no start condition ! Now which is your problem ?

There are two fuse's IGN A fuse 40amp and IGN E fuse 10amp ,both are located in the under hood fuse/relay box . Also there is starter relay located in the same under hood fuse /relay box . There also is a crank fuse 10amp in the under hood fuse box . Besides the fuse's and relay ,the ignition switch or the PNP - park neutral position switch could be bad . Testing the whole starter circuit should be done ! How to voltage drop test starter motor circuit

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I think the purple wire (or maybe the yellow) from the neutral safety switch goes to the coil side of the starter relay, turning it on so power is sent from there to the starter solenoid. You could check for this signal to the relay with a test light. The key must be held in start while you probe the other two terminals for the relay. If the signal is there, either a bad relay or the coil side of relay is not grounded properly. It is possible that the coil side ground is the neutral safety switch-grounding the relay's coil side only in park or neutral-in which case the nagging light on shifter (between off and run, it only works?) may be telling you the safety switch is the problem.

You may need to look at a wiring diagram, Greg. But the starter relay is the last component in the start circuit before the starter solenoid. From battery to ignition switch to "crank" fuse to neutral safety switch to starter relay to starter solenoid to starter-and back to battery through ground. That is the start circuit. Just that the wiring tying them all together makes it complicated.

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In the picture below, the upper portion is the starter solenoid while the one below it is the actual starter.
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Given the amount of work to overhaul a starter, you might consider just replacing it.

So recommended course of action is determine if there is +12VDC at the starter solenoid when IGN switch is turned to START.

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