horn relay revisited

Schurminater

Schurminater

Hero member
Location
Surrey Hills
Morning to all,

apologies for revisiting this topic but i just need a bit of clarification on fitting a horn relay,my brain is just recovering from sorting out the indicators!!.............. 6V Bulb  WTH ???

Anyway for the experts or those that have done this before i have the standard wiring harness set up with Twin Voxbell horns (new).

Can i use part of this harness to power /connect to the new relay? rather than run  a new wire from the battery,I have purchased a 30A fused blade type.

Pin 86 is where i seem to be stuck on which is the old horn feed.

I have been studying these previous post for help.

http://www.laverdaforum.com/forum/index.php/topic,93518.15.html

Dellortomans seems to be the closest to what i am asking but i still need clarity to wire it.

It's not clear from Cape's diagram, so just to clarify ...

The fused feed from the battery to pin 30 is the one that's carrying the horn current (maybe 10 Amps), so it needs to be sized appropriately, as does the fuse. Pins 85 and 86 only carry the signal current that switces the relay (a fraction of an Amp), so can be lighter gauge wire.

The old feed wire to the horn that Cape shows as powering the relay solenoid via pin 86 is big enough to also carry the horn current (that's what it was doing before you put the relay in the circuit). So you can save on wiring by using that old horn feed to provide power to pins 86 and pin 30, eliminating the necessity for a separate fused feed from the battery to pin 30.

I am using the Late triples with BTZ ignition wiring diagram 1980 Jota.

Green wire = Horn button
Green/black = to Horns
Black = to Horns.

Thanks

Steve











 
Schurminater said:
Morning to all,

my brain is just recovering from sorting out the indicators!!.............. 6V Bulb  WTH ???


Thanks

Steve
Click to expand...

Ha ha. Had exactly the same problem. Brand new indicators. All of them blew the bulbs when the bike was being inspected for registration. Fortunately the tester didn't care. All bulbs were 6V.
 
:D glad its not just me then Davo......funny enough mine was a new one too,had me running around for ages the little bu**#r
:D

That's why I want the horn to be simple.
 
So just further to this,am i right in saying that the two wires which feed my horns at the moment and have 12 volts supply to them ........

Should be used to feed pins 86 and 30 on the relay giving 12V supply to it.
The horn button should be connected to 85
Then the horns connected to 87

The other wires to the Horns can be used as earths or made as going to earth?

anyone?

Steve
 
Well, originally the horn power feed is provided by the ignition switch directly to the horns and the ground of the horns is running via the horn button.

Cape's suggestion tries to avoid both potential bottle necks in the chain, the horn button and the ignition switch.

I rather do not like it this way, as you avoid the ignition switch bottle neck only for the horns. Better way is IMHO to install a mains relais, to unload the ignition switch in general from all consumers of electrical power, which I did on my bike, where it is working very well.

If you would like to keep the original horns feed wire to  the horns, just avoiding the horns button as a potential bottle neck, you have to wire the relay the following way:

85 - tap into the horn feed wire or any other switched batt + from ignition switch
86 - to the horn button
87 - ground wires of the horns, formerly routed to the horn button
30 - ground

Alternatively you can do it the way as you just described, but then the other wires on the horns, formerly going to the horns button, have to be grounded.

Regards,
Stefan


 
Many thanks Stefan,

A great help and explanation too, you have helped me see it clearer now and i understand the reasons for,how and why its connected like that.

I appreciate your time and effort. (thumbup) and will try and fit it over the weekend.

Thanks again

Steve
 
(clap) relay fitted this morning,Horns now a honking like a wild Goose......Very happy and couldn't have done it without the help and information scripted within these pages .......Special thanks also to Stefan  (salute).

Next job.....fairing back on.....and one step closer to a start up. (thumbup)
 
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