Fiamm horn relay wiring

[timdaw]

Can anyone help me with the terminals on this Fiamm horn relay please? I don't know if it's original to my Aurelia but the relay fitted is like in the photo below. The 3 terminals are marked T, B and G. Can you tell me what these correspond to on a modern relay, or where they should be wired too?

I'm not very good with wiring and the wires disappear into the loom, so I can't trace them physically. Reason is that I'm adding a supplementary horn to increase the volume!

 

[williamcorke]

The standard pair of horns, which I think are usually Fiamm, don't need a separate relay and are plenty loud enough for most people's taste. I can probably find you a pair...

Here's the S3 wiring diagram. You could make a tester with a bulb to trace the wires...

[timdaw]

Thanks William. I have that diagram in Paul Mayo's manual. I note that the 4th series DID have a relay. My installation looks all orignal, so maybe they did fit a relay later on in 3rd series. My horns both work but I find them inadequate for modern driving where people have so many distractions. I need a horn to wake them up!! I've established which is the live - T, so I'll connect it up to the new horn...the aptly named Denali Sound Bomb, made in Italy!

[chriswgawne]

Yes Tim, 4th srs did have a relay which is of course slightly safer electricity wise . I find the original horns to be very loud actually-maybe you need to change to some FIAMM Air horns which were an aftermarket accessory back them? I might be able to help you with a age appropriate set but I cant check until towards the end of January.
Chris

[timdaw]

Thanks Chris, are these the correct original horns below? If they are then I don't find them loud enough. But I'm quite impressed with the Denali unit. I've tucked it away so it's not visible and it makes a sound very reminiscent of vintage air horns!

[Richard Fridd]

Have you tried tuning them with the adjusting screws?

[williamcorke]

Those horns should be pretty loud. Each unit has 'points' like a distributor than can be filed/sanded flat and then adjusted for gap using a central slotted screw and locknut. Trial and error, once the points are true and clean, will tell you when they are 'on song'. Wear ear defenders!

[timdaw]

Thank you again for the very useful advice!

[timdaw]

The existing horns are made by Sparton, and American company. According to Paul Mayo's manual these were fitted to B10, 21 and 50. I took one apart and the diaphragm was split badly, which would explain the poor sound!