Ian Barrett Posted January 30, 2012 Share Posted January 30, 2012 Sorry if this has already been covered guys, I expected it to have been but I did a search for Glass Fuse and have read through 3 pages of results without finding the answer. I blew a fuse fitting and testing a lighter socket in my Ninety then discovered I didn't have a single spare glass fuse. So this weekend I pulled off the fusebox cover and bought spares for every variation from a local shop. But when I just pulled the 12a fuse for the horn etc it says on it 12 amps continuous LUCAS 25A So, are my new fuses correctly rated or should they have 2 values - because they don't. Incidentally, I couldn't get 12a or 17a so I have gone up to 15a and 20a respectively anyway. Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted January 30, 2012 Share Posted January 30, 2012 Be careful uprating fuses, the idea is the fuse burns out before the wires do... When i first opened the fusebox in my 110 everything was fused at 30 amps and i've been chasing problems in the wiring since. Be very careful. Quote Link to comment Share on other sites More sharing options...
Ian Barrett Posted January 30, 2012 Author Share Posted January 30, 2012 Should I go down in ratings then rather than up a bit ? So where I couldn't find 12a use 10a instead, and with 17a use 15a instead ? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 30, 2012 Share Posted January 30, 2012 Should I go down in ratings then rather than up a bit ? Yes 17A is a common size cable for example, so of the circuit is wired with it and you run 20A through it without blowing the fuse, over time you will melt the wire... 15A is close enough to 17A to not cause you any problems, same for 10A and 12A. Quote Link to comment Share on other sites More sharing options...
Smego Posted January 30, 2012 Share Posted January 30, 2012 Great in theory but "normal" blow fuses are designed to blow at 1.5 times their rating.... I could lecture on about safety factor calculations but can't be bothered the lower will be fine. Quote Link to comment Share on other sites More sharing options...
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