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Username Post: Ignition A fuse        (Topic#350652)
KaelFarmer 
Senior Member
Posts: 1013
KaelFarmer
Loc: Eau Claire, WI
Reg: 03-28-02
04-16-18 01:24 PM - Post#2731182    

I recently acquired a 1997 Chevy 1500 truck. When I got the truck it had not been run or driven for an extended time (since end of last summer). When I went to look at the truck it needed to be jump started. The following day when I went to pick it up it also had to be jump started, so I figured that I would likely need to replace the battery after getting home. I was able to drive home with zero problems. Over the next few days I drove the truck to run little errands even though I had not replaced the battery, but it started without any problems. On one of those errands, the truck died as I pulled into a parking spot. When I went to leave, the truck briefly cranked over but did not start. After 3 tries the engine stopped cranking. I assumed that the battery may have given up so I attempted to jump start it again with zero success.

Since I was already planning to replace the battery, I got a ride to the store to purchase a new battery. Installed the new battery and still could not get the truck to start. I then checked the fuses and found the 40 amp "Ignition A" fuse had blown. I replaced the fuse and it blew immediately when I turned the key to start the engine. Replaced the fuse a second time and verified the battery cables were tight. This time the truck started right up and I was able to drive away without any problems. I stopped to put gas in. Restarted the engine as usual. Got home and parked in my driveway. The next day tried to start the truck and again blew the Ignition A fuse. With a quick glance, I do not see any loose connections or broken wires. I have now replaced the fuse 5 times and can not get the engine to start.

Are there any suggestions as to where I should be looking for a wire that may have become shorted?

Thanks,
Kael



 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3970
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
04-17-18 01:03 AM - Post#2731248    
    In response to KaelFarmer

Unplug your oil pressure switch. If that cures it, replace the switch

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
someotherguy 
Moderator
Posts: 28694
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
04-17-18 10:31 AM - Post#2731290    
    In response to KaelFarmer

Wish I had some service info handy to see what all is on that fuse. In the owner's manual it just says "ignition switch." Mind you the 1995-up style ignition switch has been known to be a little problematic, but I wouldn't rush to change it out just yet as I don't think I've read anybody's symptoms including blowing the fuse.

Maybe look up some service info online through Autozone (free to sign up and look), Alldata, Mitchell, etc. to see what all is on that circuit so you know where to begin looking.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
KaelFarmer 
Senior Member
Posts: 1013
KaelFarmer
Loc: Eau Claire, WI
Reg: 03-28-02
04-17-18 12:16 PM - Post#2731306    
    In response to someotherguy

According to the wiring diagram, the only other things that appear to go to it are the Ignition Switch, Neutral Safety switch and the starter solenoid.

Here is a link to a copy of the wiring diagram (diagram #21). https://www.autozone.com/repairinfo/repairguid e/re...

I previously had a Dodge van that would blow an ignition fuse about 1 minute after starting. I checked EVERYTHING I could think of in the starting/ ignition system and could not find any issues. I finally found the problem at night when I saw sparks coming from the alternator and determined that a bearing had failed. Up until that point, I would have never suspected to check the alternator especially since I drove to the store and when I was ready to leave, the problems showed up. Before this problem came up, it did not provide any indication of the alternator having problems

Kael



Edited by KaelFarmer on 04-17-18 12:20 PM. Reason for edit: No reason given.

 
bowtie44s 
Valued Contributor
Posts: 3965
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
04-17-18 05:41 PM - Post#2731339    
    In response to KaelFarmer

Is that one of the big maxi fuses? What fuse do the auxiliary posts run off of? I don't think it was ignition A but it's worth a look.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
KaelFarmer 
Senior Member
Posts: 1013
KaelFarmer
Loc: Eau Claire, WI
Reg: 03-28-02
04-17-18 07:06 PM - Post#2731345    
    In response to bowtie44s

Yes, it is a 40 amp maxi fuse. I will look over the diagram again a little later tonight regarding the auxilary posts



 
bowtie44s 
Valued Contributor
Posts: 3965
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
04-18-18 02:39 AM - Post#2731375    
    In response to KaelFarmer

Or with the fuse out, just see if they have power with a test light. I do know for sure they aren't on the same fuse so check them both.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
someotherguy 
Moderator
Posts: 28694
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
04-18-18 09:11 AM - Post#2731414    
    In response to bowtie44s

The two AUX terminals on that underhood center have their own maxi-fuses.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
KaelFarmer 
Senior Member
Posts: 1013
KaelFarmer
Loc: Eau Claire, WI
Reg: 03-28-02
04-18-18 04:40 PM - Post#2731471    
    In response to someotherguy

So far, I have crawled around in the snow a little bit to peak around at the wiring near the starter. I am going out of town for a few days to someplace that doesn't have snow. The truck hasn't run for a few days, so a few more won't be a problem. I will examine it more when I get back next week.

Thanks for the input so far

Kael



 
KaelFarmer 
Senior Member
Posts: 1013
KaelFarmer
Loc: Eau Claire, WI
Reg: 03-28-02
04-25-18 04:02 PM - Post#2732194    
    In response to KaelFarmer

I found the source of the problem. This one was actually right where the problem should be. It was a break in one of the wires going to the solenoid. I made sure to look for the easy solution first, but I also appreciate the input I received from others here in case it wasn't an easy solution.

Kael



 
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