Join Date: Dec 2002
Location: Saint Louis, Missouri
Re: Easiest way to hook up a horn
Looks good to me also and like Steiner said, install a fuse right at or as close as you can off of the battery.
The wire size probably being short runs could be 12-14 gauge. No need to go up to 10 gauge.
Looking at this again (and I've wired PLENTY of relays like what you have basically drawn) is to change or reverse what wires are going to terminals 30 and 87. I've read about doing this before and I forget about doing it this way but if you have power going to terminal 30, then 87a also has power coming out of it when the relay is not being triggered or activated. If 87a is left exposed in this wiring configuration then it "might" be easier to hit this with something and short things out and blow the fuse at the battery. Now if you were to wire up the main input power to terminal 87, then terminal 30 will have power coming out of it when the relay is triggered by the horn button and when it's off terminal 87a will show no power. Basically, less chance of having a live terminal out of the relay that could be shorted.
Just thought I'd add this.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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