What is this? DPO or factory?

[Stewart]

Oh great powers of BCF what is this? I know its not the hazzard or turn signal flasher unit.

 

[Kimberly]

What are the color of the factory wires connected to it?
Are there any markings or numbers on it?
Did you ever figure out what the transformer was used for?

 

[Darwin]

horn relay perhaps?

 

[bcliff]

Looks like a seat belt buzzer.
Bruce

 

[19_again]

I go with horn relay, purple and yellow. I'm in the process of installing a new harness, to paraphrase Mick Jagger "I dream in colors".

 

[PAUL161]

Going by standard wire colors

Horns-Purple/Purple & Black
Horn Switch-Black/Purple & Black
Trunk Lamp Switch-B/Purple & White
Trunk Lamp-Purple/Purple & White
Ignition Key Warning Buzzer-Purple & Green/Purple & Pink
Ignition Key Warning Door Switch-Purple/Purple & Green
Sequential Seat Belt Control Unit-B,G,NP,(PG),YG,YK,YO,YP,YU.

Your wires appear to be purple & Green/Purple & White or is what I think is white, pink?
Even though my first impression would be a horn or light relay, I have not a clue!

Unplug it and see what doesn't work!

 

[Scott_Hower]

A 73 MGB never had relays for the horns. Looks like a buzzer can to me, almost certainly for the ignition or seat belt warning system.

 

[PAUL161]

A 73 MGB never had relays for the horns. Looks like a buzzer can to me, almost certainly for the ignition or seat belt warning system.

Looking at it some more, I'd have to say the same thing Scott.

I wonder what the transformer on the left was for?

 

[Scott_Hower]

I wonder what the transformer on the left was for?

Noticed that too; looks like a choke. Probably for suppressing ignition noise in the radio.

Twas' common back in the day, before resistor plugs. I'm sure Ol' Doc has seen his fair share

 

[Rick_Stevens]

Seat belt warning buzzer. Stewart, do you have loose/cut wires on the seat belt clip (the static one on the inboard side of the seats)?

 

[Stewart]

Car didnt' have belts or any interior when I got it and the harness is pretty well hacked and is going to be replaced this week.

Never thought it could be a buzzer I always thought they were square boxes. I'll have to put some power to it and see if it still works.

 

[dklawson]

You guys keep saying "buzzer" but what I see in the picture looks like a Lucas flasher unit. I know the color codes don't indicate that... but it's what it looks like to me.

Are there any letters near the spade lugs?

 

[vping]

It's the buzzer. I had one out the other day and thought it was a flasher relay. When I hooked it up to a 12V power source it buzzed. Found the one that ticked, which is the one that I needed for the flashers, installed it and it worked.

 

[dklawson]

If it's a buzzer... would it be audible under the bonnet? Does one of the wires go off to a speaker of some sort?

 

[Stewart]

Bummer it didn't work. Just went click oh well.

 

[PAUL161]

If it's a buzzer... would it be audible under the bonnet? Does one of the wires go off to a speaker of some sort?

Doug, it appears to be behind the radio in the center console, not under the bonnet. You could hear it there very well. I have one door switch that hangs up and the buzzer won't buzz unless I tap on it. I refuse to fix it, as I hate that buzzer.

 

[dklawson]

Thanks for clarifying where it is/was.

 

[DrEntropy]

I thought that too, Doug. Then saw the "fresh air" flap and re-evaluated the location. feh. Mind's eye trickery.