[Mgs] 80B, melted white-green wire from ignition switch

Robert's New iPad mgbobh at gmail.com
Tue May 31 05:44:25 MDT 2022

	In the Jan/Feb 2022 issue of MG Driver, David Wright, of Southern British Car Club, wrote a useful article about fuses.
	He noted that the fuse rating standards were changed in 1980, from the rating being the ‘blow’ current to the rating now being ‘operating current.  It is an interesting article, with graphs and all, with the takeaway being that we owners of pre 1980 cars must be especially careful that the modern fuses we buy are not stronger than we realise.
	His conclusion is that the modern AGC 15 and 3AGC 15 are the available equivalent of the Lucas 35 amp fuses; the modern SFE 20 or AGC 20 the equivalent of Lucas 50 amp fuses.  
	All MGB drivers have installed an inline fuse into both fuel pump and overdrive wires, haven’t we? 

> On May 31, 2022, at 6:13 AM, PaulHunt73 <paulhunt73 at virginmedia.com> wrote:
> 5A or 10A, or even the original 17A, would protect the cars wiring in the event of a short but it needs to be as close to the supply i.e. at the ignition switch to do that.  Fuses in the wires that go into the radio are there to prevent very thin internal wires from actually burning in the event of an internal short, they won't protect the cars wiring if the short is on the supply side of that fuse.  So if the same fault should happen again, you will get the same result.
> PaulH.
>> On 31/05/2022 09:08, Steve Shoyer wrote:
>> I put in a 5A fuse for the switched power rather than the 10A fuse that came with the radio, hoping that it would blow quickly if there was a short somewhere in the circuit that I didn't see.
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