Urgent help please !

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kapri
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Urgent help please !

Post by kapri » Wed Aug 08, 2018 8:06 pm

Booked for MOT tomorrow , spent ages getting the speedo ( and instrument lights working today . Thought all was well but if I switch all lights on within the count of 10 there is a click from the fusebox / near the fusebox and ALL power seems to shut down ? Is there a thermal overload in the fusebox ( SE6 ) and if so what /why / how triggers it please ?



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Post by scimjim » Wed Aug 08, 2018 8:14 pm

No thermal cutout - there are relays behind the glovebox, does it do it if the headlights are on dip?


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Post by kapri » Wed Aug 08, 2018 9:06 pm

I haven't tried on main beam but OK on sides , then switch on dipped beams , count to 10 and click. It does appear to be taking out my ignition switch power as well but could be something else . Was all fine until I reconnected dash lights into circuit ?



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Post by Coupe Racing » Wed Aug 08, 2018 9:13 pm

Why not disconnect the dash lights for now as I don’t think they are part of the MOT

The cause of your problem might be the dimmer


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Post by kapri » Wed Aug 08, 2018 9:28 pm

Dimmer was bypassed before I got it . Speedo light needs to work for mot :(



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Post by scimjim » Wed Aug 08, 2018 9:32 pm

So does the speedo but not many testers will actually check :D


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
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1300 SS1 (Number One) & Sarah's coupe.
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Post by Terry H » Wed Aug 08, 2018 9:42 pm

If this car is an SE6 (September 1975 to September 1976) it will be mot exempt wont it.
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Post by AJL Electronics » Thu Aug 09, 2018 8:41 am

Thermal cutout effects are generally cause by loose terminals in the fuse box. The poor connection causes the contacts to heat up and that melts the plastic, allowing a worse connection to develop.


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Post by tanuki » Thu Aug 09, 2018 9:52 am

When I took the SST for its first French MOT, the engine stopped and would not restart when the guy tested the ... horn :roll: :evil:
Opened the fuse box, cleaned and straightened the connections on the horn fuse ... then everything worked again :w
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now: Scimitar SE5 ('71), Scimitar SE6a ('79), Scimitar SST 1800Ti ('90), Ford Anglia LHD ('61), Ford Consul Capri LHD ('61), TVR Chimaera 400 ('96), Caterham SV ('10), Lexus IS200 ('04), Austin Metro 1000 ('82)
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Post by kapri » Thu Aug 09, 2018 9:02 pm

Well it made and passed it's MOT but developed another few interesting electical problems :(

Foot on brake lights cause entire electrical system to shut down after about 30 seconds ( bit of a problem on an auto! )

Fan stopped operating and even manual override wouldn't work.

Temp gauge stopped working , then started again then stopped then ...

I've tried printing off the A and B SE6 wiring diagrams from files . However they come up as A2 size both when viewing and trying to print ? Am I doing something wrong ?



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Post by peter freeman » Thu Aug 09, 2018 9:33 pm

There are two sets of drawings the full drawing and the a's and b's - The a's an b's I have done as half drawings so they can be put back to back and laminated - easier to see and you have the whole drawing to carry around in your car. That is if you are referring to the drawings here - https://www.scimitarweb.co.uk/~nenoggins/Wiring.htm You should be able to select A4 size and preview the print before actually printing. Sounds like you could have a bad connection at the rear of your fuse box



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Post by drcdb15 » Thu Aug 09, 2018 10:24 pm

peter freeman wrote:
Thu Aug 09, 2018 9:33 pm
Sounds like you could have a bad connection at the rear of your fuse box
Indeed - if the whole lot is shutting down, perhaps a bit of back to basics is called for - starting with the main battery earth cable earthing point, and then the battery terminals themselves. And then moving on to the fusebox. If it's as apparently random as it sounds, it seems likely the whole fusebox internal connections at the fuses could be flaky. Time to take the whole lot out, clean up fuses and holder connections, and assume there is more than one fault. Don't just stop at the first bit of gunk and assume that's it ! :wink:


Chris
MB61; formerly 1978 SE6A 3.5 V8; 1986 SE6B 2.9 EFi.

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