• Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

TR2/3/3A Is a 25 AGC fuse equivalent to an original 30 amp fuse?

karls59tr

Obi Wan
Bronze
Country flag
Offline
I recently went on a drive and the car went dead. I have an electric fuel pump. Turned the key on and could not here the usual hum the pump makes. Checked the fuse and it looked ok but no power to one side of the fuse! Installed a new fuse and I was back on the road. Why would the metai strip inside the "blown" fuse still look intact?
 
OP
K

karls59tr

Obi Wan
Bronze
Country flag
Offline
Good question...can you post a pic?
100_2357.JPG
 
OP
K

karls59tr

Obi Wan
Bronze
Country flag
Offline
I wonder if the fuse could move just enough from one of its keepers to disconnect it so current could not get thru?
 

DrEntropy

Great Pumpkin
Platinum
Country flag
Offline
Not unknown for the cap on a fuse to become disconnected from the inside strip. Ohm it and check. And as Bob notes, it could also be that the contact at one or the other of the "prongs" of the fuse holder become a bit corroded and lose contact. A piece of a "green" ScotchBrite pad in the glovebox can be valuable in that case. šŸ˜‰
 
OP
K

karls59tr

Obi Wan
Bronze
Country flag
Offline
Not unknown for the cap on a fuse to become disconnected from the inside strip. Ohm it and check. And as Bob notes, it could also be that the contact at one or the other of the "prongs" of the fuse holder become a bit corroded and lose contact. A piece of a "green" ScotchBrite pad in the glovebox can be valuable in that case. šŸ˜‰
The fuse I thought was blown passed the ohmmeter test so I think the issue is with the corroded prongs so I'll try the scotchbrite pad. The lower prong dosn't seem quite secure enough. I'm wondering if it just needs to be bent in a bit? Do you think it's possible for the fuse to get jolted outward just far enough to break the electrical current? Also is the 25AGC fuse equal to the stock 30 amp fuse?
 

Sarastro

Obi Wan
Silver
Country flag
Offline
Those old-fashioned cylindrical cartridge fuses are famous for that kind of failure. I've seen it many times, as they are used in all kinds of electronic test equipment from that era, and even up to today.

On a quick perusal, the article linked above looks pretty good to me. Also a bit more briefly at the beginning of this page: > Electrical Modifications for a Bugeye Sprite <
 

jfarris

Jedi Trainee
Gold
Country flag
Offline
I had a similar looking blown fuse. The central metal strip looked good, but one of the end caps would spin around. Any ohm meter test was weak and intermittent. The best indicator was that none of the electrics fed by that fuse worked.
 

DrEntropy

Great Pumpkin
Platinum
Country flag
Offline
Those old-fashioned cylindrical cartridge fuses are famous for that kind of failure. I've seen it many times, as they are used in all kinds of electronic test equipment from that era, and even up to today.
So very true. We had a close proximity lightning strike a couple weeks ago, neighbor's new whizz-bang digitally controlled refrigerator was knocked out. Two controller boards, one with the power supply. Two smaller glass tube fuses, they brought them over for me to ohm. Both blown... a trip to the hardware store and the fridge was back up and running.
 
Similar threads
Thread starter Title Forum Replies Date
T 1971 Fuse Box and Wiring Triumph 7
W General Tech 2500S starter motor and fuse box questions Triumph 3
B TR4/4A In-Line fuse 25 or 35 Amp? Triumph 21
B MG Fuse Location Spridgets 2
K TR2/3/3A The USA Panel Light Fuse? Triumph 1
T TR2/3/3A TR3 Fuse Question Triumph 14
M TR6 Fuse box wiring mystery Triumph 9
ckeithjordan TR2/3/3A Blowing a Fuse Triumph 30
C TR2/3/3A Under dash fuse Triumph 7
M XK120 fuse problem? Jaguar 4
M TR6 Fuse, She Blows Triumph 13
S Wedge TR7 fuse panel Triumph 8
J TR6 fuse amps Triumph 2
edkap2002 TR6 1972 Blowing fuse fed by white wire Triumph 6
S TR2/3/3A try start it with the key and it blows the fuse Triumph 7
RAC68 Battery Fuse Protection Austin Healey 101
S TR2/3/3A installing a fuse in the red tail lights Triumph 4
K TR2/3/3A The under dash fuse on later TR3's Triumph 7
D New Fuse Block Configuration Austin Healey 21
S License plate light - inline fuse, BJ8 Austin Healey 7
TR3driver TR2/3/3A Late TR3A fuse box mounting Triumph 10
T TR2/3/3A Adding an auxillary fuse box to TR3 Triumph 5
K TR2/3/3A Wiring again: Fuse box Triumph 5
Lin Fuse box - new product in my current project, a 1964 jaguar mark tw Austin Healey 10
rjc157 Fuse box Austin Healey 9
Got_All_4 TR2/3/3A Need pics of fuse box area Triumph 6
jfarris TR2/3/3A Fuse to protect OD solenoid Triumph 9
GTP1960 TR2/3/3A Modern blade fuse box ? Triumph 20
K Popping my mind and a 50amp fuse Austin Healey 10
TRclassic3 TR2/3/3A Help with fuel gauge blowing fuse Triumph 6
Rut Fuse/relay box Spridgets 19
K Preventing fires, to "FUSE or Not to FUSE"? Austin Healey 24
B MGB 79B hazard line fuse MG 1
D TR6 Fuse equivalent Triumph 11
D TR6 Blower fuse Triumph 4
D TR6 Fuse Triumph 3
B 79 Midget,what size fuse do i need in each of the 4 slots? Spridgets 22
vette Fuse Sizes for New Fuse Box Austin Healey 11
rjc157 fuse box Austin Healey 12
S TR2/3/3A TR3A Blown Fuse Triumph 12
T TR2/3/3A On TR3A what gauge wire from fuse box to coil? Triumph 17
B Fuse amperage Spridgets 7
johnrip Wedge TR7 side marker Light issue fuse keeps blowing Triumph 2
B In-line fuse Spridgets 4
doates Fuse Box Problems Triumph 8
D Best Way to Clean Corrosion on Fuse Clips. Jaguar 3
K TR4/4A TR4A Stock AM Transistor Radio Fuse Size? Triumph 14
wkilleffer 1993 Cutlass convertible blowing a fuse Other Cars 7
Brosky Easy add on fuse block Triumph 7
V Fuse amp ratings MK III Spridgets 1

Similar threads

Top