Question about Chevrolet Silverado 1500

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20amp fuse ignition circuit keeps blowing on 1988 Chevrolet C1500 when vehicle is put in gear

Tested diagnostics on OBD 1 checked for short to ground on circuit none found could there cause be another cause safety switch at transmission

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  • Chevrolet Master
  • 1,243 Answers

Check for bad wiring or chafed insulation

Posted on Dec 07, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 99 Answers

SOURCE: Check engine light comes on. p0171 and p0351 codes found

From Lusty Kid:

I know the economy is bad, but change all of the plugs. Check your PCV Valve hose, 150 rottens them out allowing air to be sucked in, thus all kinds of codes.

Depending on mileage. Dismount the EGR valve and clean passages. If you are really good dismount the throtle position sensor body and clean out passages with Choke Cleaner., dismount where the EGR valves connects to the engine, clean out passages. Also check the hose thats behind this mounting to ensure is not clogged. If clogged clean it out. If not replace it. Is about 1.5 ft. long, connects to the PCV Valve Hose.

When is the last time you change your harness. Can't remember??? Replace it. Good Luck

Posted on Dec 26, 2008

relaga58
  • 158 Answers

SOURCE: Wiper fuse keeps blowing intermittently.

It looks like the wire circuit for the wiper motor is touching the car body when shaken so the only thing you can do is shake the wires and terminals yourself while engine is running then maybe you can pinpoint where the earthing is.

Posted on May 08, 2009

c17hydro
  • 2984 Answers

SOURCE: i have a 1988 jeep

Diagnostic Connector To read Diagnostic Trouble Codes (DTC's), the test connector for the electronic engine control system must be used. The test connector is more commonly referred to as the Data Link Connector (DLC). On all Jeep models through 1990, the DLC is a 6-pin and a 15-pin connector located under the hood on the right side of the engine compartment. On 1991–93 models, the DLC is located under the hood on the left side of the engine compartment near the powertrain control module. On 1994–98 vehicles, the DLC is located in the passenger compartment, under the driver side dashboard.

Data Link Connector (DLC) location — Jeep models through 1990

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Please don't forget to rate and let me know if this helped you.

Greg

Posted on Jul 11, 2009

  • 1 Answer

SOURCE: engine 1 fuse keeps blowing when you turn the key

Engine 1 fuse powers the computer and some sensors. I had this same problem on a 98 chevy van 3500 and found the wire going to one of the oxygen sensors had shorted out on the heat shield. Inspect the wires going to all of the oxygen sensors. On this van one of the oxygen sensors on the driverside the wire was laying on the heat shield which eventually rubbed through the wire and shorted it out blowing the fuse. Your short could be on a different sensor but check all of the oxygen sensors because the wire runs so close to the sharp heat shield.

Posted on Aug 06, 2009

  • 1340 Answers

SOURCE: Error codes P0301(cylinder #1 misfire)

The ECM is very possible.I assume cylinder 4 injector is providing gas?The connection for cylinder 1 is probably a connector with pins correct?If you can bypass the ECM,that would get you closer if not give the answer.I would try using a wire straight from the battery to the injector electric somehow without damaging the wires.For years,if i had an extension cord which was old,I cut off the ends and save it just for troubleshooting occasions like this is a good example.If you do the bypass,try to hold the wire with something other than skin.I have leather gardening gloves,pliers.The gloves are better for steadiness and pliers are metal.It is not likely that it should melt but doing electrical work for so many years,an ounce of prevention is worth way way more than a pound of cure.If it did melt,it would stick and probably a couple weeks worth of pain.I would like to know how you make out.If you reply back to this post I will get an autolink to your post.Good luck! Greg
P.S.Was your error code from the car's own system and not a shop?I am trying to figure out what year that system started.
Thanks

Posted on Sep 18, 2010

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My 2004 Chevrolet Malibu Classic keeps blowing the Ign sw-batt1 (40A) Maxi Fuse What do I do?


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1990 Suburban 1500 with diesel and 700R4....Driving on freeway at normal speed in overdrive.... suddenly vehicle downshifts out of OD, and blows fuse for dash gages. When fuse replaced, and with ignition...


To begin with you are OBD 1, dont relie for a code its limited, there is a short touching ground, well first lets do the operation and work are way in 700r4 is a 4l60 so 1990 makes it a 4 or 3 wire connection so lets start here, (because it will make a trouble shooting tree sense) three terminal then trouble shoot it . on the transmission 1.Ignition(+) ,2. fourth clutch control 3. TCC control. . Here its three wire leading to transmission . The most problable is the ignition wire, that goes to the transmission when this goes it peg the speedometer, and because its ignition or IGN(+) we will be concern about this on,because without it it wont let you move the gear so lets follow its route and see where it will touch. something is interrupting this circuit. from ignition switch it goes to brake switch so look at the brake switch open the harness wire if you have to.and look for wire touching, then it goes to transmission Okay I am stump here also so OD is shorting (IGN+) Do this better it a all in one shot get the harness at the transmission its a three wire four pin connector inspect that connector open the harness if you have to , look for zip ties that may have squeezed open the wire together,trouble shoot the IGN wire from steering to OD switch ,you may have to replace the IGNition wire from brake switch to key area to transmission

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20 AMP FUSE BLOWS WHEN IGNITION IS SWITCHED ON IGNITION SWITCH TESTED AND OK


something connected too ignition sdwitch has short to ground. remove all fuses except 20amp that blows turn on ignition see if blows. if not replace one by one till it does to isolate circuit. which fuse is blowing and where is it located.

woodysmechan kiesha76@hotmail.com

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