Adding Hella horns to an 03 GT

[PTGT Redman]

Just installed my Hellas.
Each Hella has a 2 piece bracket. In order to get enough "slack", I separated the bracket for the more outer horn and used this as the extension. I used a bolt with washer and lock washer for the extension and for the main attachment at the OEM horn mounting plate.
My caar (03 GT) had connectors for the hi and lo horns (300 and 500), however only the hi was occupied. the other connector was taped to the main harness and tucked away.
Wasn't a bad install and the sound is much fuller now. Kinda feel a little vibration from the low horn tho. I put some electrical tape to keep the two horns from directly contacting eachother.

[westgate]

Ok i just picked up a set of Hellas 85115. I have an 05 Touring edition. Only one stock horn and wiring for one. Now electrical is totaly Greek to me. Do i need to use the relay that came in the box? I am looking at the diagram and instructions that they came with and it is giving me a headache. If so i may that it to the shop and have it done right.

If i do not have to use the relay then do i just cut the original wires and bring two of each wires off the original to the new horns.

Oddball ? Is there a + and - (terminals/connectors) i should be looking for?

[PTGT Redman]

I suppose you could add wire to create a y split, so the harness can support both. Only issue is if it would cause a voltage drop off when both horns are held on.
The horn you have now is 400+ Hz right?
You should use the blade connectors to hook up the wires to the horns. Split the wires to create a set for each...ie: solder or tie two new wires to the original striped and black wires, and then crimp blade connectors to the ends of the 4 wires.
Unless you hold the horns down all day, I can't imagine it would draw to much power. I could be wrong, see what others have done also.I didn't use the relay. As far as + and -, I selected the brass terminal for - (black wire) and the silver looking one for power (striped). I am referring to the blade mount punch color.