T4 horn problem

[GO1965]

Hi there, I have just replaced the standard horn on my 1998 transporter T4. I bought a Nautilus 12v twin air horn from ebay. I simply replaced existing horn and it worked perfectly ( for 2 weeks). Used it today and nothing happened. I have checked all fuses and are all ok. Horn was supplied with a relay but I didn't fit it as I wasn't sure where to fit it and horn worked 1st time, I took off steering wheel horn plate and got a spark from wires when touched but no horn sound. I also refitted original horn and still no horn, checked horn on battery and it worked fine.
My questions are
1,Which fuse is for horn and what size should it be?
2, Which relay is for horn?
3, Should I have fitted relay or does van already have one?
4, How can I check wiring with multimeter?
Thanks in advance
Gary

[nickdavis19]

i had this problem, i installed a horn, it worked fine and then it died. it turned out to be coroded wires near the horn. try and trim back the wire so its clean and re connect the horn.
hope it helps.

[Brian Considine]

3, Should I have fitted relay or does van already have one?

In a word - yes.

When you have sorted the problem be sure to fit the relay !