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MG TD TF 1500 - Adding an emergency flasher

Lets face it...once in a while were on the side of the road. I'd like to add an emergency flasher to the Green Hornet. I have a set up out of a late 60's MGB, switch , flasher, warning light and wiring. It works and did a temp hook up on the car to the relay terminals. Gave some thought to jumping terminals 6 and 7 and terminals 2 and 3 together but my suspicion is that it will light the front turn signals when I apply the brakes ( no helper to verify). Looks like the two green wires off the bottom of the rocker switch off the B should provide a break for the voltage to the turn flasher when engaged.

So has anybody set one up on their T? Any advice? wiring directions?
LaVerne

LaVerne, I've done this to Lazarus. I'll have to find the wiring diagram. One of the modifications is to rewire the turn signal relay so that it can be actuated without the ignition switch being in the ON position. Bud
Bud Krueger

Found my old hand-drawn sketch plus one that I had started. This should work. Note that the power for the hazard switch is taken from terminal 2 of the fuse block, always hot. It is connected to both sides of the relay box through run-of-the-mill simple diodes. The normal turn signal switch is then connected through another pair of diodes. This to prevent the hazard switch power from affecting other circuits, e.g., fuel pump. I've been using the setup for quite a while and it's worked fine for me. I have the hazard switch mounted on the driver's side kick panel using an illuminated switch. Bud

Bud Krueger

If I'm reading your schematic correctly Bud, you only have the flashers on the rear lights. Is that correct?

The B rocker switch has a separate set of poles that are N/C but open when in the hazard on position and I'm thinking I could run the the two hot flashing wires off the hazard unit to terminals 2 and 6 and put diodes between 2 and 3 and 6 and 7. And run the leads from A4 through the N/C portion of the rocker.

Thoughts?

Clearly not so good with the photo shop but you get the idea.

LaVerne

No, LaVerne. The only change is in regards to how the relay is closed. There is no change to the routing to the lamps. The turn signals function by actuating the relay on one side of the can by applying power to either terminal 4 or terminal 8. What I do is apply power to both of them simultaneously.
Try this to see it happen. Connect terminals 4 and 8 together and then connect them to 12v. Watch all of your turn lamps flash. (I'm using a heavy duty flasher, but I'm not sure that's necessary.)
Just spotted an error in the schematic. I don't use A4 at all. The wire for the turn signal switch is connected to A2, as is the wire for the hazard switch. The lamps get their power from the 'L' terminal of the flasher.
Corrected version:


Bud Krueger

No, LaVerne. The only change is in regards to how the relay is closed. There is no change to the routing to the lamps. The turn signals function by actuating the relay on one side of the can by applying power to either terminal 4 or terminal 8. What I do is apply power to both of them simultaneously.
Try this to see it happen. Connect terminals 4 and 8 together and then connect them to 12v. Watch all of your turn lamps flash. (I'm using a heavy duty flasher, but I'm not sure that's necessary.)
Just spotted an error in the schematic. I don't use A4 at all. The wire for the turn signal switch is connected to A2, as is the wire for the hazard switch.
Corrected version:


Bud Krueger

LaVerne,

Another option is to install this lucas kit.
It does the following:

1/ changes from a switched input to a direct feed.
2/ uses its own heavy duty flasher unit.
3/ Gives a seperate flashing warning light.

http://www.autoelectricsupplies.co.uk/product/215

I have fitted it to an early MGA, these have the same
flasher circuit as the TD/TFs

John

J Scragg

What size diodes Bud?
LaVerne

I just do "The Chicken Dance" when broke down!

I have found myself by the side of the road 4 times in the TF. Never been there even 5 minitues before someone stopped to offer help.

My other cars ...forget it, I could freeze to death in 20 below weather with flags & flares going for days.
David Sheward

I think that something on the order of 2 or 3 amps should be more than adequate. Just has to handle the turn signal relay current. Something in the back of my senior memory wants to say that I used 1N4004's. Bud
Bud Krueger

Just remembered that I have the53's turn signal relay in the basement. Measured the current draw for the relays. They each draw just about .75 amps. So, my senior memory was right, after all. 1N4004's will work fine. Very common diode, easy to find. I used their lighted SP/ST rocker switch. Bud
Bud Krueger

Thanks for the help Bud and John.

Thanks for the smile David. Got a vision in my head of a one legged man scaring the crap out of on coming traffic.
Maybe I just need a trunk monkey.
LaVerne

This thread was discussed between 04/03/2012 and 06/03/2012

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