Question about 1999 Chevrolet S-10 Pickup

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Truck won't start, the 2 black wires on the fuel pump harness is not connected.. Not sure where they go.

I have a problem, I have a 1999 chev s10 and it wouldn't start. I found that the fuel pump wire harness has 2 black wires that wasn't connected. ( I just bought the truck, and someone fixed it before) I am not sure where the 2 black wires go, I think they maybe grounds, but not sure. Can you please advise me. Thanks

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  • Richard Scordino May 11, 2010

    Does the pump run? Did it run when you bought it? If those wires were disconnected and it ran, even if incorrect, it should still start if it did before. Do you have spark and all that good stuff?

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  • 11 Answers

Black usually indicates ground make sure you scape the frame very good before attaching.

Posted on Jun 20, 2009

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Posted on Jan 02, 2017

  • 137 Answers

SOURCE: Are the two black wires hots or grounds ????

they are both grounds but one is a direct ground and the other goes to a splice pack that goes back to the intake air temp sensor and the map sensor. clear as mud, huh? that's what the wiring diagram shows. the sensor grounds are fairly important. hope that hleps

Posted on Jun 03, 2009

  • 5252 Answers

SOURCE: 1999 chev blazer won't start new fuel pump

So, do you hear the pump buzz on, when key is on? If that's good, then check your ignition circuit: check for spark at a plug. Use insulated pliers, hold end of plug wire 1/4 inch form engine bolt or ground source. When cranked, you should see a bright blue spark. Yes? Try another plug wire, too. No? Try another plug wire. If you have NO spark, could be your coil, coil pack, crank position sensor, ignition module. I would recommend using a diagnostic flow-chart to go through the ignition circuit. That way, you are not replacing unecessary parts_Expensive! Of course, if you have spark at plugs, your ignition circuit is good! Then you have to look further, like your injector circuit. Good luck.

Posted on Oct 30, 2011

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