Check my Circuit Diagram, please

[rtcosic]

Rewiring the indicator circuit.
1951 car, so 1955 C&U Regulations Part II B don't apply.

I have already modified the Lucas 'torpedo' side lights to twin filament and LED bulbs. The indicator source is very bright amber and the side light is white. The bulb includes a circuit that turns off the side light when the indicator is in service.

Currently, there are separate (ugly) rear indicators.
I have fitted LEDs to the side and brake lights. The side lights are very red and about as bright as the original brake lights. The brake light is also very red and very bright.
I want to use the brake lights as indicators, as was standard in the UK pre 1955 and seems to still be used in the USA.
I want to retain the Trafficators (Semaphores) and I have LED bulbs with integrated flasher units, so I do not need two separate power sources. I know this means these may not flash in unison with the other lamps.

I want to add a hazard switch.

I am in the process of assembling a board to carry all the new components and some others. This will sit under the dashboard out of sight.

I am copying this arrangement from YouTube.

This is my proposed circuit:

This is the original vehicle wiring diagram with the colour code:

Can anyone spot any flaws before I make a start?

Can anyone recommend a suitable free drawing application that I can use to make a better diagram to retain for future reference? SketchUp seems rather clunky for this sort of thing. One with a shallow learning curve!


I am aware of the reproduction Lucas DB10 Flasher Lamp Relay, but using four relays is less than half the cost and easier for the mish-mash I'm planning and fully compatible with LEDs and anything else I might throw at it in the future.

I have switched the car to negative earth.

 

[Master-of-none]

Is the flasher unit (and buzzer) running continuously?
You could control the brightness of the LED by adding series resistors

Hazard flashing will be defeated at the rear, if the brakes are used, it will appear just as brake lights.

I used Yenka (possibly free for home used from https://yenka.en.softonic.com/)
It allows circuit drawing and simulation.

 

[rtcosic]

Is the flasher unit (and buzzer) running continuously?

The flasher unit has permanent power as the YouTube reference. The buzzer is on the flasher output side.

You could control the brightness of the LED by adding series resistors

I don't want to reduce the brightness. I was pointing out that, unlike the 1950's, there is a vast difference between side and brake/indicator brightness, so less potential confusion between services and easily visible brake/indicator lights in bright sunshine.

Hazard flashing will be defeated at the rear, if the brakes are used, it will appear just as brake lights.

That is true, but hazards should only be in service when stationary.

I used Yenka (possibly free for home used from https://yenka.en.softonic.com/)
It allows circuit drawing and simulation.
View attachment 496980

I'll give that a go - looks simple enough for me.

 

[rtcosic]

That downloads a file imaginatively named 'file' with no extension. What do I open it with?

 

[Master-of-none]

That downloads a file imaginatively named 'file' with no extension. What do I open it with?

If you are brave enough, rename it to something like installyenka.exe, but there is an obvious risk, pass it by your antivirus/defender before running.
The program was originally called/owned/run by crocodile clips who still have versions to download https://crocodileclips.net/descargar-crocodile-clips/ (site is in Spanish, but program uses English)

Handy hints:
Components explode when overloaded, you can turn the behaviour off or adjust voltages, add diodes, resistors, voltage ratings etc of components. Right click properties...
components can be rotated by right angles for better viewing, when selected, a ° symbol shows that mode.
Have fun!

Yenka.com/ and slumdog.com are the current supplier but I think they may charge for a licence, home use used to be free, with an annual renewal

 

[RWD3M]

For my 36 Morris, working from this:

And the car, I created this using Visio:

If that's the sort of thing you mean, I'm happy to share the .VSD

 

[bricol]

Seeing as you mention regs you don't need to comply with, there are some more recent regs were/are retrospectively applied. The Road Vehicle Lighting Regs 1989

Stop lamps being one - unless first used before 1936, they must be steady - ie not flashing. So while you can have a red indicator (up until the mid 70s I think) you can't have a completely off brake light - so an additional bulb needed - and if you are doing that, might as well be a bright orange one, which will show orange through the red lens and not confuse a modern driver as to what the faulty brake light means on the old car in-front.

Similarly the turn signals - all must flash in phase. As for hazards - you probably know you don't need them as first used before 1986, but like a lot of car stuff, if fitted, they must comply - so orange and in phase.

With my modifications, I simply used one flasher unit to power separate relays to each sides turn signals - all in phase, and all flashing within the range allowed.

 

[rtcosic]

For my 36 Morris, working from this:

And the car, I created this using Visio:

If that's the sort of thing you mean, I'm happy to share the .VSD

I recall the name Visio. I'll give that a try.
Yes, please, may I have a copy?

 

[rtcosic]

Seeing as you mention regs you don't need to comply with, there are some more recent regs were/are retrospectively applied. The Road Vehicle Lighting Regs 1989

I've started going through this:

The Road Vehicles Lighting Regulations 1989

www.legislation.gov.uk

Schedule 7 b) ii) permits red or amber rear indicators up to 1 September 1965. I thought they were excluded by the 1955 C&U as I haven't seen them on any UK vehicle post 955 model year. Maybe the 1955 C&U just banned the dual use of stop/indicator only.

Schedule 8 does indeed require Hazards to flash in phase, but oddly, I haven't found where it says the indicators must be. Have you found it? If it becomes an issue, I can easily tap into the indicator circuit and separate the actuator and lamp sources.

Schedule 12 on Stop Lamps is silent on a requirement to be steady. Is that covered elsewhere?

It would be extraordinary for such legislation to be retrospective.

The plot continues to thicken!

 

[ajlelectronics]

Perhaps the ultimate answer is an Arduino Nano connected to everything and then you can have whatever functions you wish?

 

[rtcosic]

Perhaps the ultimate answer is an Arduino Nano connected to everything and then you can have whatever functions you wish?

I'm just not going there!!

I'm going round in circles of Microsoft Hell just trying to down load Visio at the moment.

 

[RWD3M]

I recall the name Visio. I'll give that a try.
Yes, please, may I have a copy?

I've tried to DM you with it but the file extension isn't allowed so can you DM me an email address to send it to?

 

[addjunkie]

I'm just not going there!!

I'm going round in circles of Microsoft Hell just trying to down load Visio at the moment.

A sheet of graph paper, sharp pencil and a ruler requires no electricery or software jiggery pokery, plus no virus issues.

And if armageddon happens…..you can wipe ya bum with it!

 

[rtcosic]

A sheet of graph paper, sharp pencil and a ruler requires no electricery or software jiggery pokery, plus no virus issues.

And if armageddon happens…..you can wipe ya bum with it!

See attachment 1.

I substituted the unused back of a letter from the bank for graph paper.

I am a Northumbrian, don't forget.

And my pencil was blunt.

 

[rtcosic]

Thank you @RWD3M I now have a file from Visio.

The PC offered two programs to view it, so I used Draw.io and can view it.

Now to try to draw my own.

Wish me luck - I'm going in and may be some time...............................