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Wiring harness color codes

C1500 fuel pump wire going to fuel pump test bright other tested dim wont start.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: My 99 GMC sonoma wont start..

ok... there are a couple of things you can do. i must have miss typed on the cap,rotor . in the back of the motor where the plug wires conect that is the cap that is bolted to the distributor with two torques bits that i believe are t15 in size. there may lie your problem. the posts inside are made of aluminum and they get coroded and dont alow the proper spark. the other commen problem is the exhaust the catalitic converter becomes pluged up. something you can try is remove one of the oxigen sensors and try to start it up if it runs the cat needs replaced. the o2 sensor is a 7/8 nut to remove it. give it a try

Posted on Jan 25, 2009

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SOURCE: fuel problems 97 jimmy

Yeah, The fuel pump can go bad . The normal warranty on the pump is 12 months or 12,000 miles. This is very rare . I would check if the fuel pump had a lifetime warranty.

I would also check the ignition switch, and all the fuses to make sure the fuel pump is the failure.

Good Luck

Posted on Mar 18, 2009

Molson02536
  • 3854 Answers

SOURCE: 2000 S10 4.3L

Did you verify that the relay terminals have the appropriate signals to them? 

ECM fuse B (20-amp) should provide power at all times to the orange wire of the fuel pump relay. The relay coil receives ground via the black wire, and relay coil gets power from the dark green/white wire. When the relay is closed, you should have battery power on the gray wire. 

The relay trigger wire should have power from the dark green/white wire in terminal 1 of the Vehicle Control Module (VCM) connector for the first couple of seconds after they key is turned to run (to prime the system) and when the truck is running. Checking for all the appropriate signals at the relay is where I would start. That is after I checked for diagnostic codes.

Believe the fuel relay is the middle relay out of the three in the left rear of the glove box. Last thing is to hot wire the fuel pump if you can not get it scanned, see if the pump is bad unless your going to have a shop work on changing the fuel pump.
Good luck and hope this helps. keep me posted.

Posted on May 12, 2009

  • 34 Answers

SOURCE: 7 wire harness going to blower motor resistor

There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement

Posted on Jul 09, 2009

  • 7353 Answers

SOURCE: I have a 97 gmc sonoma and replaced the fuel pump

It really helps if you post which engine you have and the 8th VIN digit. I ASSUME its a V6??? You should have 12 volts for 2 seconds on the gray wire (at the pump) when you turn the key on, If not, check the ECM/BATT fuse #9 20 amps, in the dash fuse panel. IF you do have power, then the relay is working and that is ok, If it does have power to the gray wire, then shuts off after 2 seconds thats normal. NOW while its running the fuel pump gets power THROUGH the OIL PRESSURE SWITCH. So get it running with your test wire, then disconnect your test wire. If it stalls out, then the oil pressure switch is either bad or disconnected.

Posted on Aug 30, 2010

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2ea264c.jpg

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97 chvy 5.0 -ECM B fuse blows - Wont Start - Replaced ALL parts


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