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Blown ignition fuse

Tiny
RODNEYH
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Ignition fuse keeps blowing. Replaced alternator and filled the tank. It quit blowing the fuse until it got under an eighth of a tank. Now blowing then every time engine bogs down.
Monday, January 29th, 2018 AT 7:34 PM

22 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Try pulling the gauge cluster out and disconnecting the connectors. Then replace the fuse and see what it does. I suspect that there is a short in the cluster somewhere (maybe on the gas gauge part of the circuit). I am going to do a little more digging, but this is where I think the problem will be.
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Monday, January 29th, 2018 AT 7:44 PM
Tiny
RODNEYH
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Disconnect which connectors? Not a mechanic, but pick it up pretty quick. Any way can I get a picture of what I need to remove and disconnect? Thanks, brother
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Monday, January 29th, 2018 AT 7:46 PM
Tiny
RODNEYH
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Makes sense because gas give moves erratically, up and down.
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Monday, January 29th, 2018 AT 7:47 PM
Tiny
HARRY P
  • MECHANIC
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Sorry, the first lookup I did suggested that the gauges were on that fuse. They are not. Here is the fuse box diagram. Are you talking about fuse #10? The PCM, VCM, crankshaft position sensor, ICD module, and the four fuel injectors. If I had to spitball a guess, I would say the crankshaft position sensor is the most likely problem. Check its wiring to see if it has a bare spot or something like that causing an intermittent short circuit. It would be in the twelve volt lead most likely. I will keep digging.
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Monday, January 29th, 2018 AT 7:55 PM
Tiny
HARRY P
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The fuel gauges on these trucks are notoriously jumpy and inaccurate. I would be worried if mine was not jumping with every hill, turn, and hard stop that I do in mine.
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Monday, January 29th, 2018 AT 7:57 PM
Tiny
HARRY P
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Here is an image detailing where the crankshaft position sensor is. It is provided by GM and kind of a bad image, but it communicates the point. This is the front of the engine, closer to the passenger side of the truck.
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Monday, January 29th, 2018 AT 8:01 PM
Tiny
RODNEYH
  • MEMBER
  • 13 POSTS
Yes. #10 ignition fuse. Please help man, my family's only ride. Where is the crank shaft position sensor located?
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Monday, January 29th, 2018 AT 8:02 PM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Scroll up.
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Monday, January 29th, 2018 AT 8:04 PM
Tiny
RODNEYH
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  • 13 POSTS
Thanks a lot. I will try first thing in the morning. Funny that is on the passenger side. When I got bumps on passenger side only, and meter goes back and forth.
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Monday, January 29th, 2018 AT 8:13 PM
Tiny
RODNEYH
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  • 13 POSTS
Could that positioning sensor blow the ignition fuse?
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Monday, January 29th, 2018 AT 8:22 PM
Tiny
HARRY P
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  • 2,292 POSTS
Yes, in theory. But I do not think I have ever heard of that happening. It is more likely in the wiring.
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Monday, January 29th, 2018 AT 8:38 PM
Tiny
RODNEYH
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  • 13 POSTS
I will check the wiring and get back to you. How do I contact you tomorrow?
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Monday, January 29th, 2018 AT 8:48 PM
Tiny
HARRY P
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Just keep using this thread. I will get an email when you post. It may be a few hours before I respond though. I have a two year old.
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Monday, January 29th, 2018 AT 8:57 PM
Tiny
RODNEYH
  • MEMBER
  • 13 POSTS
Thanks. I have two kids. I know what you are dealing with. This is it only ride man, got to get her rolling. You are the first person I have talked to that knows anything about this. I hope I can find this and fix it.
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Monday, January 29th, 2018 AT 8:59 PM
Tiny
HARRY P
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Well we will get you through it. If I cannot help you get it going right, one of the other techs will be able to help you out. Either way, we will help you get her going again.
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Monday, January 29th, 2018 AT 9:06 PM
Tiny
RODNEYH
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  • 13 POSTS
Great. My family appreciates it. Thanks and talk again tomorrow, hopefully with good news
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Monday, January 29th, 2018 AT 9:14 PM
Tiny
RODNEYH
  • MEMBER
  • 13 POSTS
Heyman, you there? I found a wire that goes from the front of the starter up there front of the motor. Not sure where it goes but it was frayed something fierce and almost broke in two. I taped it up, but I think I broke it because it turns over now but will not start. What wire is that and would it keep it from starting?
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Tuesday, January 30th, 2018 AT 1:49 PM
Tiny
RODNEYH
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  • 13 POSTS
I hope that is the problem, going to check tomorrow. At work tonight.
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Tuesday, January 30th, 2018 AT 5:04 PM
Tiny
HARRY P
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Yeah, that could definitely cause a no start situation. I am thinking it could be to the crankshaft sensor. You can take some pictures and post them here so I can try to ID it. But definitely go ahead and trace it down and replace as much of it as possible with the same gauge wire, and then hope for the best.

Sorry, I could not get back to you earlier. I was supposed to be off from work today so I could do my brakes and fix a few things on my work blazer. But anyways I bet replacing that wire will get you back on the road.
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Tuesday, January 30th, 2018 AT 6:43 PM
Tiny
RODNEYH
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I think so as well. It was almost in two, and my fiance moved it and it broke. I am going to repair and hope it works. Does that work go to the fuse box? The other wire goes to the battery, I do not know where this one goes. Not it is broke and you can tell it has been arching over. That is what has been blowing the fuse huh?
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Tuesday, January 30th, 2018 AT 6:51 PM

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