This weekend, after staring at them for a few days and wiring them up in my office to scare people, I've finally committed to installing the HELLA Supertones in the grille of my 07 XC70.

A few people have mentioned that they simply replaced the stock horns with these and never gave it another thought. I decided to leave the stock ones in place and and mount these next to them. I have a switch inside that I will be able to choose OEM or HELLA. I was told our Volvos switch the positive lead to trigger the horn. (True?) I have it all wired but I need to find a good place to tap the horn switch to install the toggle to select which horn. Anyone know where that is? Also where is a good place to get from the engine compartment to behind the dash without making a new hole?

Thanks.

 

I'm all set... Thanks for all the helpful suggestions