32 replies to this topic

[GraemeC]

ignition off side lights work and dipped and main beam.

 

Ignition on as soon as I turn the light switch to the first (side light) position I get dipped headlights. The main beam works as expected flash or on with the steering column stalk

 

 

That is how the dim dip system works, other than with ignition on and switch to sidelights you normally get the dip beam on dimly (hence the name).  It does this by reducing the voltage to the lamps when ignition and sidelights on - sort of an early daytime running lamp idea.

However if you are using the normal feed to the dip beam lamps to trigger a relay then there is probably enough voltage coming out of the dim dip system to operate the relay, which will then switch full voltage to lamps.

[GraemeC]

The joined together purple and black wires you found are the live feed to the horn button and to the main beam flash.  You do look to have put them back in the right place.

 

The inline fuse behind the carb provides power to the hazard circuit as well as the interior lamp.  Even if this is blown, the indicators should still work as they are on  fuse 1-2 in the main fuse box (white and green wires either side).

If you have no indicators and no hazards I would suspect the hazard switch personally - if the fuse keeps blowing try unplugging that and see if that stops it.  Then link together the two light green/white wires in the plug and see if the indicators then work.

Edited by GraemeC, 08 November 2020 - 12:54 PM.

[JDImini]

The joined together purple and black wires you found are the live feed to the horn button and to the main beam flash.  You do look to have put them back in the right place.

 

The inline fuse behind the carb provides power to the hazard circuit as well as the interior lamp.  Even if this is blown, the indicators should still work as they are on  fuse 1-2 in the main fuse box (white and green wires either side).

If you have no indicators and no hazards I would suspect the hazard switch personally - if the fuse keeps blowing try unplugging that and see if that stops it.  Then link together the two light green/white wires in the plug and see if the indicators then work.

Hi GraemeC Thank you, will try your suggestion of unplugging the hazard switch and then linking the two light green/white wires to see if the indicators work

 

Just so I'm being clear the in-line fuse only blows when the hazard switch is switched on

 

Thank you for the confirmation of purple and black horn main beam flash

[JDImini]

Just taken the hazard switch out
Not sure but the colours don’t seem to be the same as you suggested
Is it the two bottom connectors that need to be linked not any of the top 4
Looks like Both are Light Green Brown so look like they pass through the switch when in the off position if I’m reading the wiring diagram right

 

 hazard switch.jpg   107.51K   0 downloads

 

 hazard connector.jpg   62.67K   0 downloads

 

Cheers

Edited by JDImini, 08 November 2020 - 03:55 PM.

[GraemeC]

It will be those two.

 

I was looking at an '88 on wiring diagram that has them as LGW, but a slightly earlier diagram shows them as LGN.

[JDImini]

It will be those two.

 

I was looking at an '88 on wiring diagram that has them as LGW, but a slightly earlier diagram shows them as LGN.

great thank you

[JDImini]

Right quick update

 

all 4 indicator bulbs tested independently and work OK - not checked the wing repeaters as need to jack the mini up to get my hand between the wing and the tyre - yes I know it's low 

 

original indicator flasher unit both connectors rusty and one snapped of when trying to disconnect  - bugger!

 

when testing the old indicator flasher unit with 1 of the 21w indicator bulbs I get constant light so no flashing fast or slow

 

when testing the new indicator flasher unit i get no light at all  - not sure if that is because I've already blown it  in early less logical testing or there's not enough current draw to make it work

 

As I don't know if either indicator (new or old) flasher unit is working I've linked wires (this is 2 green from one side and 1 light green/brown from the other side) from either side of the indicator flasher unit so as I understand all things being equal the indicator lights would come on constant if the indicator switch was operated.

 

to take the possibility of a faulty hazard switch out of the equation I have taken it out and linked the two bottom wires from the connector both light green/brown to complete the circuit.

 

switched the ignition on and indicated right. Only rear indicator bulb came on but very dim, no front and couldn't see the repeater as slightly tinted lens cover

 

indicated left both rear and front indicator lights came on but very dim, couldn't see the repeater 

 

then both bulbs went out and guess what I blew the top fuse which is white one side and Green ?? the other, so not sure what this proves?

 

It's not the hazard switch?? But don't feel any closer to working out the answer.

Edited by JDImini, 08 November 2020 - 03:59 PM.

[GraemeC]

That fuse feeds the flasher relay (as well as lots of other things that are only live with ignition on).

 

So you have a short somewhere on one of the indicator circuits. The fact that it doing strange things on both sides of the car is odd.

Given you’re initial problem of smoke coming from the stalks, I would next try replacing the hazard switch but disconnecting the stalk at the multi connector under the column.

 

With the stalks disconnected you could also try shorting between the LGN with GR and then separately the GW

[JDImini]

That fuse feeds the flasher relay (as well as lots of other things that are only live with ignition on).

 

So you have a short somewhere on one of the indicator circuits. The fact that it doing strange things on both sides of the car is odd.

Given you’re initial problem of smoke coming from the stalks, I would next try replacing the hazard switch but disconnecting the stalk at the multi connector under the column.

 

With the stalks disconnected you could also try shorting between the LGN with GR and then separately the GW

Hi GraemeC yep just trying that now as it might be the indicator stalk's the culprit

[JDImini]

Didn't get to any of that as now have no power to ignition after blowing the 35a fuse 1-2, replaced the fuse and still no joy. I've got power to fuse 3-4 but that's it. No ignition lights when turning the key

 

shut the door on it this evening 

[GraemeC]

The ignition provides power to that fuse

[JDImini]

The ignition provides power to that fuse

OK Thanks, umm so what have I done wrong that switching the ignition on is not getting any power

[Ethel]

The bottom two connections just allow the switch to connect the indicator flasher to the column stalk when the hazards are off.

 The colours are correct.

 

The other 4 are all connected together instead of the indicator feed when you select hazards: green/white & green/red are right & left indicators, one wire feeds one of the small terminals on the side of the switch to power the bulb inside. The other (green/purple) is a permanent live coming from the hazard flasher.

 

Your old flasher is behaving as expected on your test. The bulb should light because the contacts in the flasher are closed at rest, it won't flash because a single bulb has twice the resistance of two in parallel, so not enough current flows to heat up the bimetallic contact breaker inside the flasher unit. Since your new one does nothing at all, it's possible it is shorting internally - try your tester on it again, but with one wire on a spade terminal and the other on the body.

 

The ignition doesn't have a fuse. Does the heater fan still work with the ignition on? If it does you're looking at white wires; if it doesn't, brown wires.

 

Unplugging the indicator stalk is a good idea, before you use up all your fuses!

[JDImini]

The bottom two connections just allow the switch to connect the indicator flasher to the column stalk when the hazards are off.

 The colours are correct.

 

The other 4 are all connected together instead of the indicator feed when you select hazards: green/white & green/red are right & left indicators, one wire feeds one of the small terminals on the side of the switch to power the bulb inside. The other (green/purple) is a permanent live coming from the hazard flasher.

 

Your old flasher is behaving as expected on your test. The bulb should light because the contacts in the flasher are closed at rest, it won't flash because a single bulb has twice the resistance of two in parallel, so not enough current flows to heat up the bimetallic contact breaker inside the flasher unit. Since your new one does nothing at all, it's possible it is shorting internally - try your tester on it again, but with one wire on a spade terminal and the other on the body.

 

The ignition doesn't have a fuse. Does the heater fan still work with the ignition on? If it does you're looking at white wires; if it doesn't, brown wires.

 

Unplugging the indicator stalk is a good idea, before you use up all your fuses!

Hi Ethel, thank you for the advise I'll try over the next couple of nights

[JDImini]

Hi Ethel at last got to look at the mini. Heater works with the ignition on so going to look at white wires and see how I get on
Thanks Darren