5a rear lights wiring

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Pommy
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5a rear lights wiring

Post by Pommy » Mon Apr 15, 2019 7:19 pm

Does anyone have a simple drawing of the rear light cluster wiring back to the multi plug in the boot recess. I find it really hard to visualise from the diagram in the manual, a drawing of the rear loom and where each wire goes to/from would be great. Many thanks Pommy


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1973 Se5a Auto

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scimjim
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5a rear lights wiring

Post by scimjim » Mon Apr 15, 2019 7:57 pm

The loom comes via a plug break in the LH rear cubby box, to the LH light cluster.

There, the side lights, reverse lights and brake lights are teed off to the RHS.

The windscreen wiper, and RH indicator obviously don’t split at the LHS but go straight across.

IIRC, the earth is a bolt at the rear of the chassis on the LHS.

So according to the wiring diagram (I haven’t physically checked a car) you should have these at the plug going to the LHS light:

Black - earth (might not be at plug break?)
Red/black - LHS side light - splits off to number plate light, then becomes red/orange to LHS side light (might actually change colour before going to number plate lights or may split earlier to give two red/black wires in?)
Green/brown - LHS reverse light - splits off as green/brown to RHS reverse light.
Green/purple - LHS brake light - splits off as green/purple to RHS brake light.
Green/red - LHS indicator
Green/white - RHS indicator

Plus the following rear wiper wires

Black (might not be at plug break?)
Green
Brown/green
White/green
Blue/green
Red/green


Jim King

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5a rear lights wiring

Post by Pommy » Mon Apr 15, 2019 9:59 pm

Thanks Jim, I will try to follow your directions, looks like
someone has hacked the wiring about, colours differ, pictures I can understand but I will give it a go. Pommy


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5a rear lights wiring

Post by scimjim » Mon Apr 15, 2019 10:02 pm

Most hacking normally takes place by the actual light units - if you disconnect the plug in the boot, you should be able to test every connection to confirm you’ve got a feed. Then it’s just a case of testing for continuity between the plug and the light units.


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

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), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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5a rear lights wiring

Post by Rev Light » Tue Apr 16, 2019 7:14 am

Did mine recently, and like yours, it was a mess back there. At some point there must have been a towing hook, blue snaplocks in abundance with unused wiring still in place. Plus a couple of extra jumpers to temporarily 'fix' bits and bobs. By the time I had sorted it out it was far simpler and neater. Lots of spare wire to put back in the box for later : )

Steve


SE5a 'Fancier'

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