Fuse Box Issues

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Mr Bridger
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Fuse Box Issues

Post by Mr Bridger » Fri Nov 18, 2016 8:05 am

It was inevitable really: Now I’ve got the headlights working as they should with new relays to both the dip & main beams, the next weakest link in the system has been exposed and the fuse holder for the main beams is getting very hot, too hot to touch in fact. It’s strange as the bulbs are still 55 watt, the dipped beam fuse is staying cool and the 25 amp fuse for the mains, although very hot, is not blowing.

Having sussed the strange arrangement where only one side of the fuse clip is actually live (that had me puzzled for a while :roll: ) I can only assume that either the fuse box is faulty or it is not actually up to the job.
Has anyone fitted a more up to date fuse box to their car, and if so which one fits? Or is the original box fit for purpose and it’s just that I need a new one?


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Re: Fuse Box Issues

Post by philhoward » Fri Nov 18, 2016 8:27 am

Daft question but why is the original fuse still actually carrying that much current if you've fitted relays? A relay coil only draws mA, not the 8-10A it used to.


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Re: Fuse Box Issues

Post by AJL Electronics » Fri Nov 18, 2016 8:28 am

Heating of the fuse is due to poor contacts.


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Re: Fuse Box Issues

Post by toomanysabres » Fri Nov 18, 2016 8:38 am

The relay MUST be in the wrong blue/white line.
Post up a diagram of what you connected to what and how you fed a battery live to the relays.


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Re: Fuse Box Issues

Post by Mr Bridger » Fri Nov 18, 2016 9:06 am

I'll take a photo of the set up tonight. Pretty sure the relay is wired up the right way round, but the symptoms would indeed suggest otherwise. An ammeter across the fuse terminals would confirm but I don't have one of those unfortunately.

AJL - That's what I was thinking originally.


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Re: Fuse Box Issues

Post by toolmanchris » Fri Nov 18, 2016 10:20 am

Mr Bridger wrote:
Has anyone fitted a more up to date fuse box to their car, and if so which one fits? Or is the original box fit for purpose and it’s just that I need a new one?
Yes I have fitted a modern blade type fusebox and relays to my 5a have a look here: http://www.toolmanweb.com/scimitar/Electrics.htm
Also split out a lot of the items that were grouped together on the same fuse in the old fusebox. Got the instructions from Tony Idle.

Chris


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Fuse Box Issues

Post by Mr Bridger » Fri Nov 18, 2016 7:31 pm

Well, confusion reigns.... it appears that my car might have an earlier wiring loom fitted. it's chassis number starts with a 93 but the loom has no provision for the original relay and what I thought was the operating circuit (for want of a better phrase) is actually the power circuit and runs through the fuse box. The fuse in question is fuse 11/12 which the SE5a hand book says should be spare. Hard to explain in a forum post, but basically this obviously needs more investigation. A lot more investigation.

Oh, and since disconnecting the high beam wires from the fuse box the horn, cigarette lighter and horns have stopped working, which looking at the SE5 wiring diagram is no surprise.

Edit: I did find the original relay underneath the fuse box, completely isolated from any wire what so ever :roll:


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