I need to get some fuses for my 72 Pig. There are 2 types, SFE and AGC. What type should I get, and whats the difference between the two? I think size is one variable, but havent been able to find which is better or type we should be using in these older trucks.
From the interwebs: Both the SFE and AGC are glass fuses with a meltable link within the glass.
The SFE fuses all measure 1/4" in diameter. The length is determined by the amperage rating, which varies from 5/8" in length (4 amp.) to 1 7/16" in length (30 amp). The SFE fuse is also designated as "size rejecting" because the size differences are related to the amperage rating and tends to prevent interchanging different amperage ratings.
The AGC fuse measures 1 1/4" in length and the diameter is 1/4" for all amperage ratings.
I just bought a blade style fuse box and replaced the glass fuses. It also has an indicator for every fuse which lights up red when they are blown. Looks good and there is room for spares too, might be worth looking into, I've hidden mine in the glovebox.
OP owns a 68 and 72. Those would use the AGC not the SFE since the fuse holders are made for only one size fuse. Sometime in the later seventies there were two sizes, most of those were still the later size. If the OP is blowing fuses might check the fuse holder. The rivets holding it together get loose over the years causing resistance/heat which will cause a fuse to blow with no other problem. When changing fuses it's a good idea to pitch the holders together so the new fuse fits tight. If the metal on the holder seems soft you probably have a problem.
JD I removed all mine about a year ago after having an intermittent problem with my headlights and cleaned the contacts by wrapping an old No. 2 pencil with Emory cloth (like you use to clean coper pipe) and running that in between the contacts, followed by a light squeeze to tighten them up. No issues since.
Thanks. The root of this was that I had a blown fuse which caused the truck not to start. The fuses are old, so I was going to replace all of them. I picked up some AGCs today and will clean them before installing.
