Page 1 of 3
Back Brake Light
Posted: Fri Oct 25, 2013 1:42 pm
by Cyril
Hi
My new brake light has just a red and blue wire.
The old one that I am replacing has a red, black and light purple wire.
How do I connect the new to the old?
I assumed it would be red to red and blue to black leaving the purple redundant?
Many Thanks
Mark[frame]

[/frame][frame]

[/frame]
Re: Back Brake Light
Posted: Fri Oct 25, 2013 2:46 pm
by andy.pointeer
I think you old light would have been a combined rear and brake light that why it had three wires. Look at the bulbs to confirm, the old one would have two connections on the bottom and the new one only one.
Re: Back Brake Light
Posted: Fri Oct 25, 2013 3:00 pm
by Cyril
Both new and old bulbs have two connectors.
Re: Back Brake Light
Posted: Fri Oct 25, 2013 3:22 pm
by Cyril
Its ok I have just replaced the rubber, chrome, red reflector dome and kept the original wiring which is working fine

Re: Back Brake Light
Posted: Fri Oct 25, 2013 5:31 pm
by Cyril
Its done now, new cover same old electrics.[frame]

[/frame]
Re: Back Brake Light
Posted: Sat Oct 26, 2013 8:20 pm
by bmcecosse
Hmm - that is a side/brake light - so will have 3 wires...... Better with the proper Lucas bee-hive lenses really if you can find them.
Re: Back Brake Light
Posted: Sun Oct 27, 2013 12:23 am
by mike.perry
Red - Side/tail, Black - Earth, Other - Brake Light
Re: Back Brake Light
Posted: Sun Oct 27, 2013 7:42 am
by Cyril
Hard to find the original Lucas dome. Its better than what was there anyway, some flimsy oversized plastic dome with no rubber seal hanging off by one screw LOL.
As for the electrics in my car, would find more sense in the Bermuda Triangle! Still haven't got my interior light and Horn working

Re: Back Brake Light
Posted: Sun Oct 27, 2013 9:59 am
by andy.pointeer
Good to see the light is now working.
There has been a number of posts about horns and interior lights not working
search for Horn Stopped Working and Wiring interior courtesy light. These may give you a starting point
Re: Back Brake Light
Posted: Sun Oct 27, 2013 1:29 pm
by bmcecosse
Re: Back Brake Light
Posted: Mon Oct 28, 2013 12:21 am
by mike.perry
The clue is the interior light and horn are both on the same fuse
Re: Back Brake Light
Posted: Mon Oct 28, 2013 5:24 pm
by autolycus
The other common factor between horn and interior lights is that they are both switched on the return (earth) side, unlike anything else on the car. This can be puzzling at first for anyone who isn't aware, and hasn't had a look at the circuit diagram, and these people probably keep fuse makers in business when they fault-find.
Kevin
Re: Back Brake Light
Posted: Tue Oct 29, 2013 10:11 pm
by bmcecosse
" unlike anything else on the car " - the wipers are also earth switched........
Re: Back Brake Light
Posted: Wed Oct 30, 2013 3:32 pm
by Cyril
Thanks, got my original Lucas lens and also two new rubber sockets from the David Manners group.
Sorry but I am still non the wiser

with horn/light.
Lets start with this question
Where is the fuse for horn and interior light?
Re: Back Brake Light
Posted: Wed Oct 30, 2013 4:30 pm
by mogbob
Assuming a standard loom... main fuse block.
Input/ power is a Brown wire ( from Control box )....... feed to Horn and Interior and Door / Courtesy lights Is a Purple wire.
Put your Multi meter ( 20 volts DC range ) on the Brown wire and a good earth... to establish that 12 volts is getting to the fuse first of all.
Disconnect the battery and then remove the fuse, clean it up with sand paper / emery paper and test it Multi meter on Ohms this time to establish that the fuse is good.Clean the fuse holder clips and remove any rust / dirt.
With 12volts present and a good fuse to these components you will be on the right tracks. Re connect battery and test horn and lights.We'll see how you get on.
Bob
Re: Back Brake Light
Posted: Sat Nov 02, 2013 12:52 pm
by Cyril
Hi
Thursday night 9pm and my car wouldn't start in the works car park. I called RAC and after 30 mins of waiting they informed me I had a flat battery. They jump started it and it got me home.
Put new battery in and low and behold the horn is now working, so is the interior light but the only problem with the light is that I cannot switch it off so I have simply removed the bulb until I can work out why.
Horn is ok

it now turns "On and Off" at the touch of a switch.
Cheers
Mark
Re: Back Brake Light
Posted: Sat Nov 02, 2013 3:43 pm
by Cyril
Light works but stays on even when car is off.
I removed the bulb.
Is this wired correctly?[frame]

[/frame]
Re: Back Brake Light
Posted: Sat Nov 02, 2013 4:44 pm
by drivewasher
is the metal plate (switch contact) between the brown/black wire & the black wire touchung both if it is thats why lights on.
Re: Back Brake Light
Posted: Sat Nov 02, 2013 4:50 pm
by Cyril
No its stays on even when the slide plate is not touching the brown connection.
Re: Back Brake Light
Posted: Sat Nov 02, 2013 5:31 pm
by drivewasher
Then I would look at the door pillar switches. Pull them out and make shure they're not touching earth then check if light goes out.
OR remove the brown/black wire if light goes out it's a door pillar switch or the wire has come off the pillar switch and is touching the body