Help! Just Blew a Fuse? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldSkool71 · 07-10-2007, 05:01 PM

The other day I was driving listening to the radio when it just stopped working. When I got home I checked the fuse and it was blown. So I pulled it out it was a 20 or 25a fuse. According to the block and manual it should be a 3a. So I replaced a new 3a fuse in the block turned the key on and blew it instantly. I unpluged the radio lead wire from the fuse block to see if it was coming from the radio itself and it still blew the fuse as soon as the key was turned on. Not sure where to go from here im no electrician just the basics if that. Any help or suggestions would be appreciated.

thanks, Ron

Luvlegs · 07-10-2007, 05:41 PM

There is a thread in the FAQs about how to track down a short. It'll probably help you out.

cdowns · 07-10-2007, 05:43 PM

you need to physically trace that wire inch by inch till you find the bare burned spot where its shorted to the dash or firewall

Longhorn Man · 07-10-2007, 05:52 PM

What other items stopped working? Your trouble will be in one of those. I can't remember off the top of my head what all is on that fuse.

OldSkool71 · 07-11-2007, 03:25 PM

I haven't noticed anything else not working at this point. All the other fuses are ok it just this one.

GruntyPants · 07-11-2007, 03:38 PM

Have you got a Volt/Ohm Meter that you can use to test for continuity? If so you can verify a direct short to ground by hooking the black lead to a known good ground and connecting the red lead to the 'dry' side of the fuse holder(One side will be hot with the ignition on, the dry side will be hot only when a good fuse is installed). If you see any thing other than an open circuit, you'll have to physically trace that wire and see where it's shorting to ground.

07-10-2007, 05:01 PM	#1
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	Help! Just Blew a Fuse? The other day I was driving listening to the radio when it just stopped working. When I got home I checked the fuse and it was blown. So I pulled it out it was a 20 or 25a fuse. According to the block and manual it should be a 3a. So I replaced a new 3a fuse in the block turned the key on and blew it instantly. I unpluged the radio lead wire from the fuse block to see if it was coming from the radio itself and it still blew the fuse as soon as the key was turned on. Not sure where to go from here im no electrician just the basics if that. Any help or suggestions would be appreciated. thanks, Ron __________________ -Ron-

07-10-2007, 05:41 PM	#2
Luvlegs Registered User Join Date: Sep 2005 Location: Smith Mountain Lake Virginia Posts: 1,537	Re: Help! Just Blew a Fuse? There is a thread in the FAQs about how to track down a short. It'll probably help you out. __________________ "A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew!

07-10-2007, 05:43 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Help! Just Blew a Fuse? you need to physically trace that wire inch by inch till you find the bare burned spot where its shorted to the dash or firewall __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

07-10-2007, 05:52 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Help! Just Blew a Fuse? What other items stopped working? Your trouble will be in one of those. I can't remember off the top of my head what all is on that fuse.

07-11-2007, 03:25 PM	#5
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	Re: Help! Just Blew a Fuse? I haven't noticed anything else not working at this point. All the other fuses are ok it just this one. __________________ -Ron-

07-11-2007, 03:38 PM	#6
GruntyPants Registered User Join Date: Jan 2006 Location: Kennesaw GA Posts: 95	Re: Help! Just Blew a Fuse? Have you got a Volt/Ohm Meter that you can use to test for continuity? If so you can verify a direct short to ground by hooking the black lead to a known good ground and connecting the red lead to the 'dry' side of the fuse holder(One side will be hot with the ignition on, the dry side will be hot only when a good fuse is installed). If you see any thing other than an open circuit, you'll have to physically trace that wire and see where it's shorting to ground. __________________ -- Shawn '67 Short Step '70 Short Wide



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