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MG MGB Technical - Fuse rating ign/fuel pump circuit

Could you suggest a suitable fuse rating to fit put in in-line to protect the white ign switch+fuel pump circuit, off the ign switch?

Thanks,

Steve
Steve Postins

I use a standard 17 amp rated 35 amp blow as they are all (with one exception for North America some years) designed to protect the wiring and not the components on the end, unlike fusing for electronic circuits. That way you have two spares in the fusebox for your ancillary fuses as well as the ones in the fusebox. personally I'd protect the feed to the pump and another to the OD rather than put one on the white coming off the ignition switch. If you are going to do that you'd be better off putting a fuse in the brown feeding the ignition switch, and protect that wire and the switch as well.
Paul Hunt

Also...Steve...be sure to follow the wiring from the knot of snap connectors in the right corner (assume same for UK) of the engine compartment down under the car and check the condition of the harness covering. Mine was cloth and had disintegrated allowing the soft metal brackets near the clutch slave cylinder underneath to abrade the white and two other wires, causing a short and melting my harness. No need to go overboard but if it's in tatters as mine was....pull it loose, cut off the cloth and inspect the wire and re-wrap. A fuse would have been a nice thing to have in my case.
J.T. Bamford

Thanks Paul. I thought I would fuse the ign/fuel pump circuits as an item as they join one post of the ign switch whilst the overdive white runs to another (74GT) so it saves me cutting the wire and adding any more of my dodgy terminations to the car! I put a fuse in the overdive circuit near the overdive switch a while back so that's protected separately.
Steve Postins

....and thanks J.T. for reminding me that I never did sort out the length of hanging overdive wire under my Roadster, or put a fuse on that circuit. Another job!
Steve Postins

This thread was discussed on 28/09/2004

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