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Fuses

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Fuses #1
boptone Joe T Oshkosh, Oshkosh, USA Sign in to contact	Topic Creator (OP) Aug 11, 2013 07:49 PM Joined 13 years ago 24 Posts

My factory manual for the 1962 MGA mkII does not specify fuse amps. I pulled a blown 35 amp one out and was going to replace it with an Autozone one when I was warned (via web site) that I must use something called a "slow blow" fuse. Can anyone enlighten me? Thanks.

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Re: Fuses #2
Gary E Gary Edwards Kernersville, NC, USA Sign in to contact 1962 MG MGA MkII	Aug 11, 2013 08:46 PM Top Contributor Joined 19 years ago 16,369 Posts

http://mgaguru.com/mgtech/electric/et102.htm

Gary

Murphy's law

Tell a man there are 300 billion stars in the universe, and he'll believe you. Tell him a bench has wet paint on it, and he'll have to touch it to be sure.

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Re: Fuses #3
JimNH Jim Mail Nashua, New Hampshire, USA Sign in to contact 1957 MG MGA "Camilla (the Other Woman)"	Aug 11, 2013 09:47 PM Joined 16 years ago 3,567 Posts

They are cheap enough so I ordered 5 of each from Moss and put them in the tool kit in my car...not something you want to be without, since you generally can't buy them at an auto parts store.

JIM in NH

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Re: Fuses #4
ddubois Dave DuBois (RIP) Bremerton, WA, USA Sign in to contact	Aug 11, 2013 10:18 PM Joined 20 years ago 7,282 Posts

You don't need a slow blow fuse. A standard AGC or a 3AG fuse will hold the current marked on the fuse, it will blow at an increasingly quicker rate as the current level goes up, until at a 100% over current, it will blow instantaneously. The closest American fuse to use in the cars is a 15 amp standard fuse - it will blow instantaneously at 30 amps. This is the same function as the British fuses that are rated at 17 amps. 17 amps is the hold amperage of the fuse and 35 amps is the instantaneous blow amperage. Bottom line - if you replace the fuse with a standard 35 amps fuse, the fuse will not blow instantaneously until it is passing 70 amps - a level that will incinerate the wiring harness.
Cheers,

Dave DuBois
1953 MGTD
1966 MGB
http://homepages.donobi.net/sufuelpumps/

Electrical characteristics of AGC fuses.pdf 38.3 KB

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