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MG TD TF 1500 - fuse holder

I recently went to the GOF in Middlebury, Vt. and I had my 1955 mgtf 1500 inspected in the safety fast program at RPM. One of the issues found was with my fuse holder. Now it was a minor issues because I only had one backup fuse in the holder and there should be two. But when I looked into this further, I found the backup fuse was a 25amp fuse while the two inline fuses where both 10 amp fuses. The A1-A2 fuse is for the horns, and the A3-A4 fuse is for the wiper motor, signals, brake switch and fuel light. I looked in the owner's manual and the workshop manual and could not find the proper amperage for fuses. I looked in the Moss catalog and it sells both the 35 amp and 50 amp fuses. I have the fuse holder out and I am going to clean the fuse contacts. I want to set it up with the proper primary and reserve fuses. Any idea what amperage fuse I should be using? Is it different for each primary fuse? Thanks, Andre
Andre de la Chevrotiere

Andre - British fuses usually have two ratings on them. In the case of the 35 amp fuse, it would be 17 - 35 indicating that the fuse will hold indefinitely at 17 amps and blow instantaneously at 35 amps. In between the fuse will blow after a certain amount of time at the current draw above 17 amps. If you look at the specification on American fuses, you will find that they operate exactly the same way, but they are rated at the current at which they will hold indefinitely. Now the problem - a 17 amp American fuse is hard to find in a 3AG size (basically the same size as the British fuses, albeit a bit longer as I remember), but you would be safe using either a 15 or a 20 amp fuse (depending on which side you feel safer at). As for the 50 amp fuse, get an American 25 amp fuse. Cheers - Dave
D W DuBois

Dave, thank you!
Andre de la Chevrotiere

This thread was discussed on 28/06/2014

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