Question about 1998 Chevrolet S-10 Pickup

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

Where does the two black wires go from the fuel tank harness on a 1999 Chev S10, are they hot or ground wires ???? Thank you

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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

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They are grounds

Posted on Jun 03, 2009

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My 1995 Chevy s10 3.5 tbi won't spray fuel to the tbi, won't start and I redone all the ground wires but it still isn't grounded wats my problem


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Hello! There is a sensor ground wire ...Color is Black/Light Blue (pin#4 of a 22 pin connector on the PCM which is sensor ground...That is the same wire multiple that feeds ground to the fuel pump unit (a variable resistor that senses whether the tank is full or empty)...When the vehicle heats up this ground which is more than likely corroded or rusted becomes resistive and opens...The vehicle has some years on it and it's not uncommon for ground straps to rust through,,,The gauge drops to empty...This tells the system; "I'm out of gas" and Sets the fuel level sensor signal to the PCM shutting down the engine...

Your going to need a multimeter (preferably digital) and a wee bit of experience using it...If your not up to this just send a comment and you can then take it to a mechanic and describe the problem specifically...

If you have a meter ( home improvement stores sell them for under $20)...Here are a couple of test procedures to narrow down and solve the problem...

There is a four wire connector that comes out of the top of the gas tank that may be to difficult to reach...Wire colors are...Black...Dark Green/Black...Black/Light Blue and...Light Blue/Yellow...The wire you are interested in is the "Black/Light Blue"...This is a chassis ground wire...There should be Ground straps on the frame...With the meter set on X10 ohms scale... Search under the vehicle for that section of wire harness comming out of the top of the gas tank that contains the above mentioned colors...When you find it ...push the point of a safety pin into the Black/Light Blue wire...Clip one meter probe to it and the other probe to bare metal chassis ground...Or make that probe wire long enough to touch the negative battery post...You must read zero ohms or very close to it...Record reading...Next clip one probe to bare metal chassis ground (a bare fender or firewall bolt...The other to the center of the negative battery post...Meter set the same...Record reading...Next move from chassis ground to the engine block (bare metal)...Record reading...Send results to Saailer

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Keep It Super Simple! It never fails!

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