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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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 Posted: Sun Apr 11, 2021 7:29 pm Post subject: fuse question. |
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From what little I understand, a fuse should be on the supply side of a switch but both my main and dip headlamps are on a single 35amp fuse at the control box.
If I kept that fuse as it is but added a fuse to each of the two circuits (between the relays and the filaments) I thought it might give me half a chance of retaining some lights if one or the other circuits shorted out.
OR won't it work like that? |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Sun Apr 11, 2021 7:36 pm Post subject: |
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That's fine so long as the individual lamp fuses are significantly lower in rating than your 35 amp one.
Peter.
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1939 SS Jaguar 2 1/2 litre saloon |
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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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| Posted: Sun Apr 11, 2021 7:47 pm Post subject: |
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| peter scott wrote: | That's fine so long as the individual lamp fuses are significantly lower in rating than your 35 amp one.
Peter. |
Thank you Peter. Yes, I plan on having the dip fuse smaller than the main beam ... and the main beam fuse smaller than the big fuse in the control box.
Likewise, the side lights could also do with being better fused. |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Sun Apr 11, 2021 8:18 pm Post subject: |
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It's certainly not nice to place the full battery capacity across parts of your wiring loom but you do need to weigh up the likelihood of this happening against the likelihood of corroded fuse holders and their connections to the wiring causing failures on a dark night in the pouring rain. Every extra interconnect detracts from your overall MTBF.
Peter
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1939 SS Jaguar 2 1/2 litre saloon |
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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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| Posted: Sun Apr 11, 2021 9:31 pm Post subject: |
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| peter scott wrote: | It's certainly not nice to place the full battery capacity across parts of your wiring loom but you do need to weigh up the likelihood of this happening against the likelihood of corroded fuse holders and their connections to the wiring causing failures on a dark night in the pouring rain. Every extra interconnect detracts from your overall MTBF.
Peter |
Point taken  |
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petelang
Joined: 21 May 2009
Posts: 442
Location: Nottingham
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| Posted: Mon Apr 12, 2021 12:13 pm Post subject: |
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Plus, if you get a dead short you might end up with two fuses to replace instead of one.
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Daimler Fifteen 1934
Armstrong Siddeley 15 Long 1933
Daimler V8 250 1969 |
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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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| Posted: Mon Apr 12, 2021 1:30 pm Post subject: |
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| petelang wrote: | | Plus, if you get a dead short you might end up with two fuses to replace instead of one. |
Yes, but if the 35 amp fuse were to blow there would be something seriously wrong.
Supply of fuses is something I will never have to worry about I have hundreds of the things left over from my Dad's garage days. |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Mon Apr 12, 2021 1:43 pm Post subject: |
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So your dad very rarely had to replace a fuse?
Peter
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1939 SS Jaguar 2 1/2 litre saloon |
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alastairq
Joined: 14 Oct 2016
Posts: 1950
Location: East Yorkshire
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| Posted: Mon Apr 12, 2021 3:18 pm Post subject: |
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Of course, the proper solution to having to carry bags full of fuses is to have automotive circuit breakers instead of fuses?
Saves having someone fitting the wrong size fuse too?
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Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces. |
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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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| Posted: Mon Apr 12, 2021 4:55 pm Post subject: |
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| peter scott wrote: | So your dad very rarely had to replace a fuse?
Peter |
One word springs to mind, Peter....pilfering.
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Mon Apr 12, 2021 5:55 pm Post subject: |
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One word springs to mind. Grass!
Peter
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1939 SS Jaguar 2 1/2 litre saloon |
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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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| Posted: Mon Apr 12, 2021 7:05 pm Post subject: |
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| peter scott wrote: | One word springs to mind. Grass!
Peter |
Bit harsh considering he made no secret of it. Everyone at Walkers Engineering was on the take. They used to brag about their unofficial "perks".  |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Mon Apr 12, 2021 8:44 pm Post subject: |
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After leaving school I served part of an apprenticeship with Ferranti and there were all sorts of "homers" there. In the context of this forum I remember there was a guy with a Riley RM who decided to encase its underside in sheet brass to protect it from the road salt. Everyone had to pass through the gatehouse but in those days they didn't inspect the undersides of vehicles.
Peter
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1939 SS Jaguar 2 1/2 litre saloon |
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Ray White
Joined: 02 Dec 2014
Posts: 6304
Location: Derby
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| Posted: Mon Apr 12, 2021 8:51 pm Post subject: |
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I once found a holdall in the garage full to the top with brass swarf. It was too heavy for me to lift but it got there somehow!  |
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Rick
Site Admin
Joined: 27 Apr 2005
Posts: 22438
Location: UK
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| Posted: Mon Apr 12, 2021 9:07 pm Post subject: |
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| peter scott wrote: | After leaving school I served part of an apprenticeship with Ferranti and there were all sorts of "homers" there. In the context of this forum I remember there was a guy with a Riley RM who decided to encase its underside in sheet brass to protect it from the road salt. Everyone had to pass through the gatehouse but in those days they didn't inspect the undersides of vehicles.
Peter |
Dad owned a couple of RMs, and worked at Ferranti for decades, but I don't think he ever lined the underside of his
RJ
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