Question about 2000 Chevrolet Silverado 2500

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2000 chev wont start at key

Will not start on key shift indicater light only comes on when key is between off and run no power to starter solenoid trigger(purple)wire,will start with key on and jump terminal at starter,will also start if I pull starter relay and jump across 85 and 86 pins and turn key to run once running must pull jumper wire off to release stater soliniod,nuetral safety switch yellow and purple both have power when key start or run maybe ignition switch not sure how to chase purple wire from ign. swiotch to starter solenoid thanks for any advise

Posted by greg pocha on

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montehammons

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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.

Posted on Apr 10, 2014

  • montehammons Apr 10, 2014

    And one other thing: the neutral safety switch should only have power in and power out only in park or neutral, but only in start, not in run.

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