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MG TD TF 1500 - TURN SIGNAL INDICATOR

A good friend on ours is installing a relay to use the low fuel light as a Turn Signal Indicator,,,, I am not well versed in electrics, and I do not have the book that he is using,,, so I told him that I would post his question here on the BBS,,,,

He Writes;
The book I am using is Practical MG TD, by Jonathan Goddard. Page 66 has the diagram. I guess it's clear enough to someone who knows how to read schematics, but this layman (call me Shorty) needs to know:
what color wire is coming from P on the flasher
what terminal on the relay attaches to flasher P
wire
what terminal on the relay goes to earth
what terminal on the relay goes to petrol and
indicator lamp and then to A4 fuse
and is that "additional fuse" in flasher X wire an
in-line
and where that flasher X wire connects


Any help out there???
SPW
STEVE WINCZE

mgaguru.com/mgtech/electric/et104.htm Try this link from Barney Gaylord.

C.R. Tyrell

The only to be able to answer his questions would be to have a copy of the schematic. Otherwise, the only part that can be answered is the first question. The answer is Light Green. The lamp is connected to 12 volts and is turned on by grounding the 'floating' end. The circuit appears to be using the flasher P signal to actuate the relay. The lamp green/brown wire would be tied to a common terminal on the relay with ground connected to the mating NO contact.

It's a complicated way of doing something as simple as connecting an inexpensive Radio Shack solid state beeper to the wire from the P terminal (other end to ground). Bud
Bud Krueger

I have the book your friend is using and have looked at the drawing. Yes, it can be made to work, but the drawing leaves out a number of connections that requires a knowledge of the entire circuit to figure out what all is going on. It is not something that I would recommend a novice to undertake, nor would I want to try and walk someone through the fabrication via e-mail. This would be particularly true if your friend's car is not already wired for turn signals as it requires much more that just a flasher relay and some wire. Cheers - Dave
David DuBois

Thanks for the replies,,,I have passed them on,,,
SPW
STEVE WINCZE

I have always wondered why you even need a turn indicator on a T series. I have a 52 with a 53 harness with all the turn signal bits hidden and just a tiny toggle switch in the center of the underdash. No turn indicator. Why?

Because I can see the little red inserts on the top of the parking lights flash when the turn signal goes off.
Chris Couper

Chaps

Here is the diagram in Jonathan Goddards book.

If it is any consolation I couldnt work it out either.

Ray

Ray Coyte


Sorry...perhaps I should hasten to say that I dont doubt Jonathan Goddards diagram from his excellent book.

It is just that I dont know enough about electrics and the wiring of my car to understand how it works.

I really would like to do this mod as it sounds elegant.

I know Dave DuBois thinks it difficult to explain how this diagram could be made to work - I am sure he is right.

But if he, or anyone else, at some point did have a go at explaining how in simple terms to get it hooked up - I for one would be very grateful.
Ray Coyte

Ray, IMHO this is a fairly easy project. BUT -- it assumes that the doer knows how to solder wires to terminals and can figure out which terminals are which on a relay. I don't think the additional fuse is necessary. It's an adjunct to turn signals so it says that the car has turn signals installed. The hardest thing will be adding another wire onto the petrol warning light terminal with the green/black wire.
As I stated above it's a lot easier to let your ears substitute for your eyes and install a simple beeper from the P terminal to earth. Bud
Bud Krueger

If you have a 12V negative ground system, this may work even easier.

http://www.shop.com/CEC+INDUSTRIES+MUSICAL+AND+VERY+LOUD+TURN+SIGNAL+FLASHERS-137494820-p+.xhtml

I had one on my wife' jeep for years. She even liked it.

Jim B.
JA Benjamin

jim,
I'd like to send along the link to my friend, it sounds like it would be fun,,,, but uit doesn't seem to get to a "loud flasher" can you refine the link?????


Thanks
STEVE WINCZE

The terminals on the coil that need to be used are earth at 85
P goes to 86
The other earth jumper at 30
And the light lead at 87.

You will need a 12 volt single pole single throw relay from Radio Shack. My favorite relay site is http://www.the12volt.com/relays/relays.asp

The purpose of the relay is to make the fuel indication a dual purpose light. But it won't flash when the fuel sender is making ground.

What I did was simply add a piezoelectric buzzer correctly polarity installed and taped it up under my dash. I hear the buzzer when the TS are flashing. Use the terminal P for panel on the flasher and go to a ground. Note that this approach requires a normally off flasher. Not all are. Chris is correct regarding the red dots, but I like my buzzer, Diane doesn't though...

Now that I think about it, if you had the always on flasher, you could get a single pole double throw relay where 87a is normally closed, and attach the light lead there.

Warmly,
Dave
Dave Braun

Thanks Dave that really helps - I appreciate it a lot.

I already have indicators hooked up to a buzzer so this mod with your clarifications should now be easy.

I am neg earth - but its no big deal reversing the polarity of the diagram and your explanation.

Looks like a job for this weekend
Ray Coyte

Steve

Try this link

http://www.streetperformance.com/part/cec-industries/none/2060922-tf510.html

Jim B.
JA Benjamin

As Dave B mentioned, using the relay circuit, the light will remain on if you are low on fuel, meaning that you don't have a flasher until you refill. To overcome this inconvenience you can make the following changes to the circuit.

Use a DPDT (double pole double throw) relay instead of the SPST(single pole single throw) then use the second set of contacts to cut off the low fuel power line, do this by cutting this line (green with black tracer) and connecting the cut ends to the C (common) and NC (normally closed) contacts of the second pole of the relay.

John
J Scragg

This thread was discussed between 10/10/2013 and 13/10/2013

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