Do I have to use a 4 amp fuse? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67ChevyRedneck · 03-02-2008, 12:57 AM

Posting here for more traffic and hopes of a quick answer.

There are two inline fuses for the engine wiring harness. They are the tube type. I broke the stupid things trying to see if they were blown

They're the odd ball half size and so far at the parts stores all I've seen are 2 amps and 7.5 amps. Is the 7.5 too high?

I think amps=watts/volts but I have no idea what wattage the truck uses?

Thanks

**1970cstblazer** · 03-02-2008, 04:07 AM

Autozone carries the correct 4 amp fuses. They protect the ammeter.

Jim_PA · 03-02-2008, 07:52 AM

I've always wondered what those were for.... and in fact, when I pull the link apart, it seems like nothing happens

mine were up towards the front of the fender on either side, I just shoved in a tube fuse of whatever I had

byrd · 03-02-2008, 08:08 AM

Quote:

Originally Posted by 1970cstblazer

Autozone carries the correct 4 amp fuses. They protect the ammeter.

Correct, they do protect the ammeter and if you use to high of a fuse it can melt the printed circuit....Randy

Wrenchbender Ret · 03-03-2008, 08:52 PM

Those go to the ampmeter. I,ve used 6 amp in them often. They fit ok. Anything longer & it will not close.

67ChevyRedneck · 03-03-2008, 09:52 PM

Thanks for the info fellas. I finally found them at NAPA. Here's the interesting thing. The guys at NAPA are always cool, and tend to actually know something about cars, and the fella even got out his electrical catalog... for the size fuse I needed, they were sold in: 1, 2, 3, 5, 6, 7.5 etc. sizes... no 4 amp, WTH?

Anyway, I bought the 5 amp ones.

03-02-2008, 12:57 AM	#1
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Do I have to use a 4 amp fuse? Posting here for more traffic and hopes of a quick answer. There are two inline fuses for the engine wiring harness. They are the tube type. I broke the stupid things trying to see if they were blown They're the odd ball half size and so far at the parts stores all I've seen are 2 amps and 7.5 amps. Is the 7.5 too high? I think amps=watts/volts but I have no idea what wattage the truck uses? Thanks __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 03-02-2008 at 12:57 AM.

03-02-2008, 04:07 AM	#2
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,827	Re: Do I have to use a 4 amp fuse? Autozone carries the correct 4 amp fuses. They protect the ammeter. __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

03-02-2008, 07:52 AM	#3
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Do I have to use a 4 amp fuse? I've always wondered what those were for.... and in fact, when I pull the link apart, it seems like nothing happens mine were up towards the front of the fender on either side, I just shoved in a tube fuse of whatever I had

03-03-2008, 08:52 PM	#5
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Do I have to use a 4 amp fuse? Those go to the ampmeter. I,ve used 6 amp in them often. They fit ok. Anything longer & it will not close.

03-03-2008, 09:52 PM	#6
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: Do I have to use a 4 amp fuse? Thanks for the info fellas. I finally found them at NAPA. Here's the interesting thing. The guys at NAPA are always cool, and tend to actually know something about cars, and the fella even got out his electrical catalog... for the size fuse I needed, they were sold in: 1, 2, 3, 5, 6, 7.5 etc. sizes... no 4 amp, WTH? Anyway, I bought the 5 amp ones. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

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