I have a 2003 ford mustang with no working horn. fuse is good. i can't locate the relay or horn. any ideas?

Horn Relay and fuse is in fuse box in engine compartment, driver side in front of strut tower. God-Bless!

the horn for your 88 mustang is under the drivers side fender

Should be a 20amp fuse marked " DRL fog horns " in the engine compartment fuse box.

The horn location is on the radiator support.

the horn and aux outlet use the same power circuit, I bet if you actually take the fuse out and replace it with a good one it will work.

I am assuming that you just looked at the fuses, sometimes a bad fuse will look good, but transffer no current.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

the horn relay is above the inside fuse box center of car i am sending you a pitcher in the next message

94 was a new model freshening and I have 94. may be similar.

Horn Relay and fuse is in fuse box in engine compartment, driver side in front of strut tower.

Horn System The horn system includes:

• Dual horns (13832) (one high pitched, one low pitched).
• Horn blow switch (13A875) which grounds the horn relay, which energizes the horns .

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I was just looking for another fuse and came across this diagram and it shows every fuse and relay and where it goes. The Fuel Pump Relay is in the O slot in the fuse box under the hood which is located near the battery. it is a 20 amp mini fuse. Hope this helps, i saved the link for future use if i need it, might be a good idea for you too. Good Luck here is the link.....
http://www.miracerros.com/mustang/2000_fuse.html

the switch is protected by a fuse and it activates the relay which handles the high current needed to operaate the back window. You should have a light that comes on when the switch is turned on.

it's behind dash panel, center.