ozroving Posted October 6, 2022 Share Posted October 6, 2022 (edited) Hello, I've got an 1991 perentie, with a bit of brake light dramas. My brake lights turn on immeadiately with the ignition. I have located and troubleshooted my brake light switch. Here is where the mystery begins. I have three sets of wires able to connect to the brake light switch. A green and purple single wire, two solid green wires, and two green and orange wires. I am also colorblind, so take that with a grain of salt 🤣. On my brake switch, I have one solid green connection and one white and green connection. With the wires disconnected from the switch the brake lights are off. Without the green and purple wire, ie just green and orange and solid connected, the lights are off. With the green and purple connected, the lights stay on with either the solid green and green and orange wires connected. The brake lights stay on no matter how far in or out the brake light switch is screwed. When I remove the switch and have the green and purple and the green and orange or the solid green attached, when I depress the plunger the brake lights go off, and when I let the plunger pop back up they come back on. So theoretically the pedal SHOULD do something, as the switch still does something when depressed by hand. But, the pedal does not do anything. The tail lights work independently off the brake lights, all else works, the brake lights are not on and will not come on when the car is off even when hand pressing the switch. There is no flickering. I am lost as to what the problem is. To me, the brake light switch still works, but the pedal has no effect on it. I recently went to a dodgy mechanic, and back in July replaced every single brake component on the entire car. Any ideas? Cheers, Mike Edited October 6, 2022 by ozroving Quote Link to comment Share on other sites More sharing options...
Mossberg Posted October 6, 2022 Share Posted October 6, 2022 Not of a great deal of use to you, but I have just had to re-do my wiring loom and the green/purple wire is the stop light. This is from a 1993 defender. Quote Link to comment Share on other sites More sharing options...
Mossberg Posted October 6, 2022 Share Posted October 6, 2022 Looks like solid green is positive to switch. I will try to look for the other colour. Quote Link to comment Share on other sites More sharing options...
Mossberg Posted October 6, 2022 Share Posted October 6, 2022 Have a look at this thread for a link to the diagram. I am trying to interprate the diagram but I don't know what I am looking and could be giving you a bum steer! Quote Link to comment Share on other sites More sharing options...
TSD Posted October 6, 2022 Share Posted October 6, 2022 Agree with Mossberg, normallly brake switch has Green (ignition switched 12v) and Green/Purple (12V to brake lamps). At least on UK version Defenders, the brake lights only work with the ignition on. With no wires connected, the lamps are off. Join the green to green/purple, with ignition on the brake lights should come on. If so, then the problem lies with the switch, or more likely the fitting of it. Did you screw the switch in nice and tight? Wind it back out until it only activates when you press on the pedal. Quote Link to comment Share on other sites More sharing options...
Mossberg Posted October 6, 2022 Share Posted October 6, 2022 Any purple I can see is permanent live. Quote Link to comment Share on other sites More sharing options...
western Posted October 6, 2022 Share Posted October 6, 2022 As the subject vehicle is a Aussie Perentie Idoubt the UK wiring diagrams are the same & Aus. Quote Link to comment Share on other sites More sharing options...
Mossberg Posted October 6, 2022 Share Posted October 6, 2022 7 minutes ago, western said: As the subject vehicle is a Aussie Perentie Idoubt the UK wiring diagrams are the same & Aus. I just thought perhaps the colours may be similar - but then i have very little land rover experience, and zero on the Perentie! Quote Link to comment Share on other sites More sharing options...
western Posted October 6, 2022 Share Posted October 6, 2022 Perentier was Aus miitary only, but now some have been retired, so not common over in UK, I don't know of any wiring info for them, maybe the 2nd wire into brake lights is part of military lighting requirement in Australia. Quote Link to comment Share on other sites More sharing options...
Junglie Posted October 6, 2022 Share Posted October 6, 2022 29 minutes ago, western said: Perentier was Aus miitary only, but now some have been retired, so not common over in UK, I don't know of any wiring info for them, maybe the 2nd wire into brake lights is part of military lighting requirement in Australia. 2nd wire might come from a flasher relay - I vaguely recall seeing an Aussie military Landy in a film or on TV with flashing rear lights. I think it might have been a "Follow Me" truck... But the advice given before should still be good - connect the solid green and one of the others. If the lights work it's good. If they don't try another combo. I'd pop a tester on each wire first to see if one is live (switched or otherwise) and check that none of them are earths as that might be...awkward. 2 Quote Link to comment Share on other sites More sharing options...
Mossberg Posted October 6, 2022 Share Posted October 6, 2022 I suppose a military truck would need to turn the brake lights off. Going off memory our sIII's in the army had a light switch that could turn off the rear lights though I am not sure how this would affect wiring. You can't really have the brake lights coming on in a combat zone! Perhaps the guys here with ex-military vehicles could pass comment. Quote Link to comment Share on other sites More sharing options...
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