Question about 1998 Chevrolet S-10 Pickup

2 Answers

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

Posted by on


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 137 Answers

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

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Chevrolet Master
  • 79,189 Answers

They are grounds

Posted on Jun 03, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

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

I can find no s10 with 3.5L engine? If you swapped engines, I'm afraid I can't help you?
I can talk to you about the basics. The fuel injector voltage circuit usually goes hot with the key on. The computer grounds the fuel injector ground circuit. engine cranking, if computer doesn't see rpm signal or there is a problem with security system, where applicable, the computer won't ground the fuel injector.

Apr 26, 2016 | Cars & Trucks

1 Answer

89 pickup 22re. no fire on no. 1 cylinder

It could be a fault in the wiring for #1 injector, or a defective spark plug in #1.

All four injectors have a hot wire to them with key on, the same black with red stripe wire is spliced to all four. Check if #1 has this hot wire with key on. The injector ground wire for #1 and #3 is a white wire with red stripe. These two ground wires splice together before the ground wire enters the computer. So the computer pulses #1 and #3 injectors simultaneously. (Injectors 2 and 4 have a similar set up, with a white wire being their ground.) If you have a hot wire to #1 injector, but no pulse on it, but #3 injector is pulsing (putting fuel into the cylinder), then the ground wire for #1 may be broke before it connects with the #3 injector ground. The wires and the splice are probably buried inside the engine wiring harness, so one could check for continuity on the ground side for 1 and 3. With key off, use an ohmmeter and check resistance between the grounds for #1 injector connector and #3-check on the harness side of the injector connectors-it should show low resistance-low ohms value. If very high resistance is shown, trace the ground wire from #1 injector.

Apr 25, 2014 | Toyota Pickup Cars & Trucks

2 Answers

Fuel gauge drops to empty, fuel light comes on, car dies and wont restart until fuel gauge decides to come back up. Seems to happen when car gets warmed up in hot weather

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

Nov 08, 2011 | 1999 Jeep Grand Cherokee

2 Answers

Fuel pump only getting 5volts

Might have a clog somewhere in the lines or fuel bowls and jets might be bad

Sep 11, 2009 | Chevrolet Suburban 1500 Cars & Trucks

3 Answers

1999 Hyundai elantra died while driving found ecu fuse blown replaced lasted half a mile and blew again

Check your o2 sensor harness. The harness if not properly secured will rub on the axle to a point where it rubs through the insulation of the wire & shorts on the axle causing the ECU fuse (20A) to blow. Repair the harness & replace the fuse & bada bing! You should be in business! Hope that works. IF NOT follow this K.I.S.S.

Keep It Super Simple! It never fails!

Jun 04, 2009 | Hyundai Motor 1999 Elantra

1 Answer

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

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

May 29, 2009 | 1999 Chevrolet S-10 Pickup

1 Answer

Fuel tank wire harness

My schematic lies to me a lot but here it is: dark blue:goes to gauge, dark green with red stripe is pump power and black is ground.
Hot wire should have 12v, dark blue should have pulsing voltage and black should be absolute ground.

May 04, 2009 | 1993 Jeep Cherokee Country

1 Answer

93 merc topaz feul pump wiring harness question

The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.

Mar 30, 2009 | 1993 Mercury Topaz

1 Answer

99 silverado fuel pump


Jan 30, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Missing wireing diagram

red and white are usually hot and black are grounds

Nov 11, 2008 | 2000 Chevrolet Silverado 1500

Not finding what you are looking for?
1998 Chevrolet S-10 Pickup Logo

191 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

79186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides