Honda City Vario Gear Lock

Hi All,

I have recently purchased a Honda City Vario 2008 and after installation of Bosch Horn in the car I faced a unique problem. After running the car for a whole day at night when I parked the car the gear stalled. It would not come out of Parking so i used the shift lock to release it but the horn also stopped working along with front speakers. I took the car to Honda the next day and they corrected the problem saying it was an electronic problem, probably replaced a few fuses and the car was back to normal, they also mentioned that the horn that i have placed is a high performance horn so that is why it happened. Anyways i asked them to correct it but they said they cannot do anything apart from Honda parts. Anyways on my way back the same issue happened again and when i parked the car this time the horn only did not work and the gear was stuck again. I then took it to a mechanic at Zamzama and they checked the fuses and the guy informed me that he replaced the fuse with a 25amp instead of a 10amp which was as per the company fitting. He mentioned that if you replace witht he same amp the same fuse will blow again. After that my car is running fine and the horn is also working. My question is if this incident which has happened is 1st common?? and 2nd having the 10Amp fuse replaced with 25Amp do any harm or was it the right thing?? The guy also mentioned that you do not need to put a relay with the horn as Honda cars already have a relay built in.

Look forward to an expert advice.