hi guys,

like many of you, i've installed fiamm horns (not air horns). lately, the horn fuse keeps blowing. i've blown three fuses out in the last 2 months. now it could be the Almighty telling me to chill, but i'm sure there's a reason why this is happening

i hooked these horns up to the stock wiring by stripping them and attaching them to the horns. i did not use a relay. i also grounded them to a single point on the body.

thanks,
bob

 

i have worked a little bit with the horn wires and what i observe, you cannot ground the wire into the body of the horn itself while it is attached/bolted to the 4runner body. It seems that the factory switch for the horn works on the positive/live wire rather than the usual negative/ground wire switching.

In this case, i changed my horn (not fiaam) but made a plastic adaptor beween the horn and the body to avoid short circuit. I didnt put any new relay-all just the stock wire/line. Just my opinion.

 

Sounds like the new horns are pulling too much current for the fuse. You could try a bigger fuse, but then there is a risk of melting some wires and starting a fire. The best solution would be to use a relay.

 

Up to '91 horns wired positive meaning lead was hot all the time. In '92-93 Toyota changed it to a negative ground meaning 1 hot lead with the horn body being grounded when mounted. Depending on your year model, adjustments need to be made. Easy to tell which one you have, if it has 2 wires it's positive. One wire and it's negative.

Since it works most the time... I'd guess the wiring is negative ground. A relay would be simple to wire in and would solve over current draws if tha's what is causing the fuse to blow. As stated above larger fuse might work and if you don't honk it for long blast, the wiring should be OK, BUT, I'd rather wire in a relay just to be safe. My $.02!! Good Luck! Bill

 

ill try a bigger fuse since thats the easiest of the two options. thanks guys

bob