Identifying later 6a wiring and other things

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Identifying later 6a wiring and other things

Post by TrevorG » Mon Sep 17, 2018 5:17 pm

Hi all, those of you who have helped or read my pleas on the difference between my late '79 6a and the workshop manuals will know that we are beginning to realise that late 6a cars have the loom or parts of it from the 6b and I am now using the 6b wiring diagrams as first call.

I have largely fixed the wiring behind the dash now and have moved onto the doors. This ageing idiot has just realised how to know if late 6a car owners should follow the 6b wiring diagrams and possibly all the extra ancilliaries.

My doors have the rear courtesy lights and under door kerb lights as per the 6b...doh! Too easy, why didn't I look before?

It may be interesting to see when these first got fitted.....was it as the 6b was introduced?

Could be a useful easy pointer for the club.



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scimjim
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Identifying later 6a wiring and other things

Post by scimjim » Mon Sep 17, 2018 6:20 pm

There were 30 6a built after 6b production began, but lots of improvements obviously crept into the late 6a.

Do you have the extra headlights fuse box on the front LH bulkhead of the slam panel?

Puddle lights came in at #4550 according to the parts list, so a little before the 6b.


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Identifying later 6a wiring and other things

Post by TrevorG » Mon Sep 17, 2018 6:32 pm

Thanks Jim for clarifying. Yes, I have the extra fusebox. Going to put a new fuse box in place of the old one as I think blade fuses don't hear up like the old glass ones, any views?



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Identifying later 6a wiring and other things

Post by Roger Pennington » Mon Sep 17, 2018 8:03 pm

scimjim wrote:
Mon Sep 17, 2018 6:20 pm
Puddle lights came in at #4550 according to the parts list, so a little before the 6b.
Yes, #4550 is late '78 - the Yellow Peril, which is Oct '78 build (and only just before #4550), doesn't have them, the mulberry car, which is Feb '79 build (and a couple of hundred after #4550) does have them.


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Identifying later 6a wiring and other things

Post by peter freeman » Mon Sep 17, 2018 8:11 pm

I prefer he older glass fuses - they have after all lasted a long time - the blade ones are relatively young but I have a collection of failed ones - they melt quite easily and you cannot get slow blow ones as far as I am aware. Reliant did not do the glass ones any favours by the way they wired them.



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Identifying later 6a wiring and other things

Post by TrevorG » Tue Sep 18, 2018 12:38 am

Peter, how about the ceramic lozenge fuses that continentals use? My old 450sl never had any problems and it was said they had the same ability as scimitars for blowing fuses. Alternatively, are the original fuse boxes available?



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Identifying later 6a wiring and other things

Post by peter freeman » Tue Sep 18, 2018 9:13 am

Fuse boxes will be available from classic suppliers - not sure about the long fuse box but he four way are certainly available as I replaced the one in my MB and fitted two in the Coupe - 4 fuses were never enough for the Coupe. Tried knife fuses in it first but they were rubbish. Never was fond of the continental fuses a bare wire to get your fingers on is not a good idea IMO - ok at 12v but not good at higher voltages



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Identifying later 6a wiring and other things

Post by TrevorG » Tue Sep 18, 2018 2:28 pm

I've seen six glass fuses boxes so could put two in.

Another query I'm afraid.....I can't get my head around the wiring shown for the interior/door light delay unit on the forum colour diagram. Assuming the lights are earthed without the diagram showing it - the diagram shows a black jumper lead that seems to make the delay unit inoperable? Am I missing something? Also, is the delay unit next to the flasher units under the dash?



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Roger Pennington
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Identifying later 6a wiring and other things

Post by Roger Pennington » Tue Sep 18, 2018 2:53 pm

AFAIK, the delay unit is behind the plastic trim panel in the roof, next to the interior lights.

See this thread for more info


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Identifying later 6a wiring and other things

Post by philhoward » Tue Sep 18, 2018 3:09 pm

I think the lighting fuse box is an oddball as it has some common terminals - not all 4 way fuseboxes are created equally as GeoffTE found out on his SE5 restoration!


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Identifying later 6a wiring and other things

Post by scimjim » Tue Sep 18, 2018 3:14 pm

The delay unit is strange, it uses the earth from the door switches to switch the positive supply to the light.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
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Identifying later 6a wiring and other things

Post by peter freeman » Tue Sep 18, 2018 3:15 pm

No point in adding all the earth's for the lights - if you cannot work out that they need earths as well then the drawing will be no use to you anyway - no black jumper lead on my drawing. Roger is right the delay unit is overhead.



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Identifying later 6a wiring and other things

Post by TrevorG » Tue Sep 18, 2018 4:59 pm

I hope I'm not going mad...the downloaded 6b diagram shows the door lights being connected via the purple lead, this also goes to the delay unit and the purple and white lead from there has the black jumper lead also connected to the door lights. If both are connected then doesn't this make the delay unit superfluous?



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Identifying later 6a wiring and other things

Post by peter freeman » Tue Sep 18, 2018 5:25 pm

The delay output is he red/blue wire and only the roof lamp is on that circuit - the door puddle lights only light when the door is open - the door being opened also triggers he delay unit for the roof light. The roof light can also be put on with the overhead switch which also operates the map reading lamp if switched the other way.The black wire is not earthed - it just happens to be black as that's the colour Reliant used - perhaps if had used purple/white it would not be confusing you.



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Identifying later 6a wiring and other things

Post by TrevorG » Tue Sep 18, 2018 5:35 pm

Thanks Peter....it was beginning to dawn on me that the door lights weren't on the delay, I've taken the delay out as it was causing problems....Onto the next problem!
Many thanks for all the help, hopefully nearing the end of the wiring puzzle.



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