Thatâs a significant difference! As an example, the 35 Amp fuse called out for many 1950âs/60âs/ 70âs vintage Britcars (Lotus Elan & Europa for sure) is roughly equivalent to a US-spec BUSSAGC 17 Amp fuse. Install a US 35Amp fuse into your LBC fuse box and the wiring harness will melt down beforethe fuse blows. Now value-you need to cover all the needs of your bike with a little bit to spare. Head light? say about 4Amp, you can easily have both beams on 8A and then there is rear light and stop and horn 0.5A+2A+4A-say 15 amp now you need a little head room, as a head lamp when first switched on draws a little more current. So this case would be OK at 20 or 25A . Then you add ignition of 2A so now we are rushing up to 30A (35A is more readily available!) Any suggestions as to whether everything is related or how to go about properly diagnosing what's up? Fuses-As this question pops up quite often then perhaps a few rules might help. The best way to look at the fuse and its position is to realize what it is there for in the first place. It is there to stop all the energy in the battery being liberated at once through a short circuit, if this was to happen then wiring would get very hot-melt-catch alight! So you must Fuse one of the battery leads and make sure that all the battery electricity that is going into the bike goes through this fuse. It can be in the earth wire (Triumphs used to do this) but convention says that on the supply side of the battery is usual. Company policy is that we do not under any circumstances issue instructions to our couriers to leave deliveries unattended when no one is at the delivery location.

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AutomotiveElectrical Fuses -- British Vs American(Tim Engelâs opinions â use at your own discretion)