Extra indicator circuit for seriesII

Post by **markattard** » Mon Jul 06, 2009 7:28 am

Would anyone please post a circuit for an indicator system, possibly switching from the same trafficator switch, which would incorporate extra indicator fittings (to be fixed in a quickly removable manner at the bumpers)

tanx

Post by **bmcecosse** » Mon Jul 06, 2009 8:01 am

Just use two relays - one for each side. If these are to be additional to 'trafficators' - then you will need two flasher units as well, but they are cheap enough!

Post by **nigelr2000** » Mon Jul 06, 2009 12:58 pm

You only need one flasher unit if it is wired in series to the feed to the lights on the relay like this one I put on my series II so I could have indicators and trafficators at the same time on the same switch. I have a picture of it and have drawn a hasty circuit, the two green wires connected together on mine are 2 diodes to run the repeater lamp in the speedo and are not needed if you already have one in your switch or use a 3 wire flasher, they were out of stock when i did mine hence the diode trick.

Post by **bmcecosse** » Mon Jul 06, 2009 9:47 pm

Well done nigel! I was sure in my mind it would work like that - but had no time this morning (rushing off to sit Diesel Driver Exam !) to sketch it out - hence I went for the simple 'two flasher' circuit.

Post by **mike.perry** » Mon Jul 06, 2009 9:55 pm

Diagram coming up

Post by **markattard** » Tue Jul 07, 2009 3:26 pm

That's it guys very well done, tanx. Three more questions please, did you use the minor 1000 flasher? What is the lamp load required on each hand to have a decent flash cycle (that is not too fast..)?

And secondly do you think you can do away with the relays if you have 2 x 10W bulbs on each side (4 x 10W in all)?

Post by **bmcecosse** » Tue Jul 07, 2009 4:12 pm

No - the flashers are designed to work with 21 watt bulbs - 2 on each side.

Post by **nigelr2000** » Tue Jul 07, 2009 6:15 pm

I used a standard 2 prong flasher not designed for any particular vehicle from my local motor factord shop, it was a fiver and the cheapest they had and yes they are designed to drive 2 x 21 watt bulbs you could use 2x 10 watt bulbs and mount a 21 watt one somewhere it wont show to make up the load so the unit will flash at the correct speed. The relays are essential as doing away with them would cause the trafficators to flash and move in and out as well ! that would not do them any good and overload the flasher unit......thats what the relays do, seperate the two circuits so the trafficators get a steady supply and the indicators a pulsed one.

Post by **ani** » Tue Jul 07, 2009 6:43 pm

[quote="bmcecosse"(rushing off to sit Diesel Driver Exam !) [/quote]

Did you pass

Post by **bmcecosse** » Tue Jul 07, 2009 7:53 pm

Dunno - takes a week to mark it - probably more considering my writing! Ever hopeful of course - but pass mark is 75% on 50 Qs - took me nearly 2 hours - some have taken 4 hours!

Post by **mike.perry** » Tue Jul 07, 2009 9:08 pm

No relays are necessary on the diagram as the trafficators are spured off between the switch and the flasher units which are 2 x 21w 2 pin units. If you wish to tow then you just use uprated flasher units, FL9s I believe. Legal flash rate is between 60 and 120 per minute.
This is exactly the system I have used on my Series MM and it works perfectly including with the trailer electrics

Post by **bmcecosse** » Tue Jul 07, 2009 9:42 pm

Would be fun to see trafficators bouncing up and down with the flashers ! Don't suppose it would do them any good - but would be a laugh!

Post by **nigelr2000** » Tue Jul 07, 2009 10:20 pm

Perhaps I should have added unless you use the 2 flasher box method which has no relays, anyway it saved me a fiver as I already had 2 old relays lying around looking for a job, that should impress BMC with the money saving aspect

Post by **bmcecosse** » Tue Jul 07, 2009 10:25 pm

Certainly does ! I had figured in my head that one flasher would do it - well done you for getting it down on paper! I too have many spare relays just looking for work.
I'm sure it will also be possible to do it using a Vellman PMK 111 - or similar electronic timer unit - has 555 IC timer at it's heart.

Post by **markattard** » Wed Jul 08, 2009 8:33 am

Yes if you use the 555 timer chip you can also put a rheostat underneat the dash to have a variable flash cycle according the day of the week, ...with a higher rate towards the weekend

Post by **nigelr2000** » Wed Jul 08, 2009 9:38 am

Wow I didn't know vellman were still going, built a few of there kits about 20 years ago when i was doing my C&G 1 2 & 3 in electronics, off to google them now