Question about 1997 Chevrolet Suburban

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K2500 Suburban with. 6.5 Diesel and the instrument fuse keeps blowing when I turn the key to the on position. When I disconnected the glow plug relay the fuse did not blow. Also while running with th

I have a 1994 chevy k2500 Suburban with. 6.5 Diesel and the instrument fuse keeps blowing when I turn the key to the on position. When I disconnected the glow plug relay the fuse did not blow. Also while running with the fuse blown the alternator is not charging the system. Any ideas where to start. Thanks in advance.

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  • 54 Answers

Did u replace the relay just a curious question, sometimes they have rust and water in the inside of the relay but my guess would be that you have a bare wire rubbing somewhere, causing the fuse to blow, anything significant has happened before that issue?

Posted on Nov 25, 2013

Testimonial: "No nothing before that would lead me to any answers. I have inspected the lead wires and do not see any wear."

  • Jeff Howard
    Jeff Howard Nov 26, 2013

    I changed the relay and the glow plugs and that seemed to fix it but then after the truck had been running for about 30 mins the fuse popped again but the truck did not die out. I know the fuse runs lots of things but it only blows if I have the glow plug relay connected so i would think it has to be something to do with the glow plugs but if it blew the fuse after it was running the glow plugs should have been shut down, right?

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alicantecoli
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SOURCE: Chevy silverado keeps blowing fuses

sounds like a mouse has got in and chewed the cables,their is no easy fix from what i can think of but check all the wires and connections in case water has got into it,or snow if your in alaska.its fifteen years old now so its possible that some insulation has broken down or a wiring loom has chaffed somewhere underneath

Posted on Feb 04, 2009

  • 2002 Answers

SOURCE: i have a 1988 chevy suburban 6.2 diesel starts

Have you changed the air and fuel filters lately? Try that first,making sure you follow the procedures in your owners manual for the fuel filters exactly as they tell you. I neglected to do that with my 1982 1/2 ton 6.2 and my son was left stranded in the Maine woods in the middle of the night. Also pick up Haynes Diesel Engine Repair Manual. It has proved to be a godsend for me because I haven't been able to find anyone here that knows anything about those motors in my area. It is Part # 10330 and can be gotten anywhere they sell car repair info or self help books. It has a good section on diagnostics as well as tips, hints and help for the diyer.It will cost about $20.

Posted on Jun 12, 2009

gypsycat00
  • 224 Answers

SOURCE: 94 chevy s10 blowing fuse

Chances are, you have a short somewhere in the wiring that is causing too much amperage to pass through the fuse causing it to blow. Use a decent voltmeter that will show opens and shorts to test continuity with the wires that run to the ignition.

Posted on Jul 11, 2009

SOURCE: I have a 2004 Chevy Malibu. and recently, the

You are correct,now to find out what circuit is blowing the fuse.If the car was in a accident check that area first.Chances are its interrior or running lights.lets start with interrior lights,install new fuse turn on interrior lights on for 1/2 hour.if fuse blows remove interrior lamp lenses and look for one of the hot wires to be shorted out on the body.To check the tail lights turn off the interrior lights and turn on the running lights.If fuse blows start with any damaged areas,check the trunk area for damage to the wire harness,if you have a trailer hitch chcek the trailer harness for damage.theres no easy fix here,hope I have been some help.Thanks for using FixYa......Ray

Posted on Jun 22, 2010

  • 1 Answer

SOURCE: fuse keeps blowing out on gauges on my 1994 chevy

there a short follow wires

Posted on Jul 27, 2010

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Hi,
Here is the location of the "Knock Sensor" you requested, I hope it helps you. It is Number 17. for future reference here is the list of the others
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The relay itself can also short out- check it while you're under there. You may have to unhook the wire that actuates the relay to get a correct reading. Turning the switch to the glowplug position with the relay unhooked will show you whether or not the wire from the switch to the relay is good.

lp

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I have a 1997 ford F350 WITH A 7.3L DIESEL, it turns over but will not start. My wail to start light or other indicator lights do not come on when I turn on the key.


The first thing to do is locate the owner manual.

Look for the glow plug relay MAIN FUSE location.

The glow plug portion of your van is not working.

This difficulty scale from 1 to 10 is a 9.

You will need a DVM and tool undo the cables to each glow plugs.

It's a 1 to 2 hours troubleshooting job.

I'm going to fire off a quick list

====
Check / replace blown glow plug relay main fuse
====

Disconnect each center nut of the glow plug wire. PLEASE CHECK ONE AT A TIME.

Read the resistance between the center of the glow plug and the metal base of the plug.

Please take good note on each glow plug resistance reading.

MAKE SURE all cables are put back and tighten properly.

Compare the resistance on all cylinders.

OPEN/high resistance is bad glow plug.

In general 3 ohm or less is OK.

You should buy one and use its value as baseline.

===

Glow plug relay can be bad.

You will need the VOM and a friend to turn the key.

Check the voltage to each glow plugs. It should be 12.6-13.6 volt.

Be careful,the plugs will get HOT.

Compare the voltage on each cylinders.

====
So the problem can be combination of

glow plug relay

glow plug relay main fuse

glow plugs

ignition switch is unlikely but I'm going to list it anyway.

Once again,this is a difficult and time consuming job. I will ask a friend to help out,

Good luck.


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Glow plugs causing starting problem


if you need connectors and terminals for the glow plug connections under the valve cover, Ford sells then so you don't need a whole $600 harness.

info for your use

Section 03-07B: Glow Plug System 1996 F-250, F-350, F-Super Duty Equipped with 7.3L Diesel Engines Workshop Manual
DESCRIPTION AND OPERATION Glow Plug System The 7.3L diesel engine uses a glow plug system which preheats air in the combustion chamber to improve cold engine starting. The system consists of eight glow plugs, the glow plug control module (12B533), powertrain control module (PCM) (12A650), engine oil temperature (EOT) sensor and barometric pressure sensor (BARO sensor) (12A644). The glow plug system is electronically controlled by the powertrain control module. The powertrain control module energizes the glow plugs immediately after the key is placed in the ON position and then determines how long the glow plugs will be on according to the engine oil temperature and the barometric pressure. The required time for the glow plugs to be energized decreases as the engine oil temperature and barometric pressure increase. The glow plugs are self-regulating, and the powertrain control module controls relay ON time. The powertrain control module protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.

Possible Causes: Insufficient glow plug ON time will not allow enough heat to accumulate in the combustion chamber to easily facilitate starting. If the glow plug system ON time does not meet any of the specifications in the accompanying chart the problem is most likely a faulty wire harness connection, ground connections or glow plug relay.

If the glow plug resistance to ground is high, the most likely causes are an open UVC (under valve cover) harness or open glow plug.
--------------------------------------------------------
Relay Operation
Install a DVOM on the glow plug feed side of the glow plug relay (large stud with two wires connected). Turn the ignition key to the ON position but do not attempt to start. Note the time in seconds from when the key is turned on and the glow plug relay energizes until the glow plug relay de-energizes. The glow plug relay makes a loud click noise which is easily heard when it energizes and de-energizes. The dome light will dim and the dash voltmeter will dip when the glow plugs are drawing current from the battery. Compare the times measured to the table (time will be affected by engine temperature, battery condition and vehicle altitude). The voltage at the glow plug feed terminal may vary from 9 to 12 volts depending upon battery condition.
--------------------------------------

-----
If battery voltage not present check for B+ at power supply terminal (terminal with single large wire). Power for glow plug power supply is supplied from starter relay through two fusible links at solenoid.
Glow Plug Operation
Disconnect all of the glow plug/injector harness connectors from the valve cover gaskets. With the pigtail installed, measure glow plug resistance to ground (preferably B-). A resistance measurement of .1 to 6 ohms indicates a good glow plug.



Glow Plug Harness Continuity
Measure for continuity from the connector harness to the glow plug feed terminal on the glow plug relay. Resistance should be less than 5 ohms.
Incorrect measurements will result if all glow plug/injector connectors to valve cover are not disconnected.

---------------------------------------------------
Glow Plug Relay The glow plug relay (12A343) has a plastic base and two mounting bolts. It is operated by the powertrain control module (PCM) (12A650) which senses engine oil temperature, PCM voltage and barometric pressure. When the engine oil temperature or the barometric pressure is low, the PCM activates the glow plug relay and the glow plugs. If the PCM voltage is too high, the powertrain control module deactivates the glow plug relay and the glow plugs immediately energize for a shorter duration, decreasing the modulation of the duty cycle.
-----------------------------------------------
Glow Plug Removal
  1. stj~us~en~file=ani_caut.gif~gen~ref.gif WARNING: THE RED-STRIPED WIRING HARNESS CARRIES 115V DC. SEVERE ELECTRICAL SHOCK MAY BE RECEIVED. DO NOT PIERCE.
    Remove valve cover (6582). Refer to Section 03-01D .
  1. Disconnect glow plug electrical connector using a pair of pliers.
  1. Remove glow plug using 10mm socket.
  1. Clean and inspect glow plug tip for damage. Replace if damaged.
Installation
  1. Install glow plug and tighten to 19 Nm (14 lb-ft).
  1. Connect glow plug electrical connector. Make sure glow plug wiring is routed to avoid moving parts.
--------------------------------------------------------------
Glow Plug Control Glow plugs are used to warm the cylinders to improve cold-engine starting. The PCM uses the engine oil temperature (EOT) sensor and barometric pressure (BARO) sensor to determine how long the glow plugs will be on. The PCM energizes the glow plugs longer if the engine is very cold or if the barometric pressure is low at high altitudes.
The PCM controls the relay that supplies power to the glow plugs with the glow plug control (GPC) signal. When the GPC signal is grounded by the PCM the relay closes, turning the glow plugs on.
The glow plugs are controlled by the following sequence:
  1. PCM energizes the glow plugs.
  1. The PCM energizes the glow plugs immediately after the ignition is placed in the ON position.
  1. The PCM then determines how long glow plugs will be on based on EOT sensor and the BARO sensor. The required time to warm up the cylinder decreases the engine oil temperature and barometric pressure increases at low altitudes.
Glow Plug Lamp Control The glow plug lamp (GPL) signal controls the WAIT TO START light located on the instrument panel. This light is used to indicate when to start the engine. The cylinders are being warmed by the glow plugs during and after this light is lit. The PCM energizes the glow plug lamp longer if the engine is very cold or if the barometric pressure is low.
When the GPL signal is brought low, the "Wait to Start" lamp is turned on.
The glow plug lamp is controlled by the following sequence:
  1. PCM lights the WAIT TO START light after a key on reset occurs.
The PCM determines the glow plug lamp activation time based on engine oil temperature, barometric pressure and battery voltage.
  1. PCM turns off the WAIT TO START light.
The glow plug lamp is turned off when the timer counts to the number of seconds specified by the PCM. The glow plugs will normally remain on longer than the "Wait to Start" lamp.
-----------------------------------

Mar 14, 2009 | 2004 Ford F350

1 Answer

Keeps blowing fuse


disconnect your glow plug relay and try it, the relay may be shorted out

Oct 25, 2008 | 1997 Ford F250 SuperCab

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