The horns don't actually know about polarity.  Just "call" the left
terminals on each horn ground and you'll be fine.

Mike

Jeffrey Vickers wrote:
> Thanks, Mike---I'll try that when I get home. Only thing I'm not sure
> about are which terminals on the horns are grounds. They are Hella
> SuperTone horns and the terminals are not marked. Does it matter which
> are 12V and which are ground.? Will the 12V or ground terminals be the
> same on both horns---left side terminals or right side terminals, or one
> left and one right?
>
> Jeff
> On Apr 16, 2007, at 12:09 PM, Mike Collum wrote:
>
>> As I see it, you want power (fused) to go to relay terminal #86 with
>> terminal #85 to ground through the horn button (horn button supplies
>> ground).  This is what will "Activate" the relay.  Then ground relay
>> terminal #30.  Relay terminal #87 goes to the ground pins of each horn
>> and the plus side of each horn goes to a fused (16 amp) 12 volts.
>>
>> You don't want to ground the horns where they mount as Vanagon horns
>> are activated by supplying ground when the horns are to be honked.
>>
>> Mike
>>
>>
>>
>> Jeffrey Vickers wrote:
>>> Anyone have a diagram for wiring dual horns with two terminals each
>>> horn? I did what I thought was correct but clearly I am missing
>>> something.
>>> Relay is is wired:
>>> --- switched/ignition on power wired to #30
>>> ---one inside and one outside horn terminal wired to #87
>>> ---one outside and one inside horn terminal wired to ground
>>> ---two VW horn leads to #85 & #86
>>> Horns bolt to bracket which is painted and probably not grounded. 87
>>> Syncro.
>>> Thanks.
>>> Jeff
>>
>
>