Author Topic: Fuses  (Read 644 times)

TTM

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Fuses
« on: September 14, 2021, 15:28:14 »
Good afternoon,

Is someone fluent with the fuse box on Aces?

The handbook says there should be 2x 25 amp fuses and 2x 50 amp fuses, which "can be readily identified by referring to the wiring diagram", except the W29340A wiring diagram that I have does not mention the amperage of the fuses illustrated.

Perhaps one with basic electrical knowledge and understanding would guess just by looking at the corresponding functions, but this is sadly not my case. For some reason the 4th fuse on the diagram is not linked to any electrical component anyway, whilst it does serve a purpose on my Ace, which goes in line with the mention of 4 fuses in use according to the handbook.

The handbook also mentions 2 spare fuses, but I do not have them and ignore where they should be mounted as there does not seem to be any extra room for these two in the fuse box.
« Last Edit: September 14, 2021, 15:37:22 by TTM »

TTM

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Re: Fuses
« Reply #1 on: September 16, 2021, 20:53:16 »
Further analysis with a multimeter has allowed to identify the function(s) of each fuse. The extra fuses also most likely sit in the two round slots moulded in the base of the fuse box.

I still do not understand however why 50 amp fuses may be used for functions that most likely do not draw that level of current.
If we consider that the headlights on full beam perhaps draw the most current in the whole system, then perhaps they won't need more than 30 amp?

3280

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Re: Fuses
« Reply #2 on: September 26, 2021, 09:56:39 »
Don't forget that the original fuse ratings are about double what the stated rating is on a modern fuse!
This gives a good layman's explanation, albeit with a transatlantic viewpoint
https://mossmotoring.com/moss-tech-101-dont-blow-a-fuse-over-your-fuses/

TTM

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Re: Fuses
« Reply #3 on: October 01, 2021, 17:13:09 »
Thank you for your interest. The headlights were a bad example actually as their circuit does without a fuse.
I suppose I will have to try several combinations then.

Side question - Is it normal for the front side lights to stay on when turning on the mains?

B.P.Bird

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Re: Fuses
« Reply #4 on: October 06, 2021, 13:08:26 »
Thomas,
Front and rear sidelights are on the same circuit (red wires) therefore the fronts have to remain on to keep the tail lights lit.
Barrie

TTM

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Re: Fuses
« Reply #5 on: October 06, 2021, 13:32:43 »
Barrie, thank you for the confirmation.

James Eastwood

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Re: Fuses
« Reply #6 on: October 06, 2021, 20:13:21 »
Confirmed  :)

TTM

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Re: Fuses
« Reply #7 on: October 07, 2021, 18:58:47 »
Thank you, James.

B.P.Bird

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Re: Fuses
« Reply #8 on: October 09, 2021, 08:49:57 »
Thomas,
Did you reach a conclusion on fuse values ? I think the Lucas cartridge fuses on my Aceca Bristol, BE 668,  were 30 amp and 15 amp.
Barrie

TTM

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Re: Fuses
« Reply #9 on: October 09, 2021, 12:21:03 »
Barrie,

I have only driven the car once, this morning, since posting this topic, and I have only been able to notice so far that 4x 35 Amp fuses seem to be doing well. Hardly a scientific conclusion though...