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This is personal opinion, but I always start at one end of the circuit; the easiest end.
In this case of a "blowing" horn fuse, I would start at the horn itself because it and much of the wiring of the circuit is relatively "open" and exposed inside the engine compartment. This part of the circuit is much easier to get to and work with than the wiring behind and below the instrument panel inside the passenger compartment.
The first "test" I would do would be to disconnect the horn wire connector plug which is usually within 2 to 6 inches of the horn. Then I install a "known good" fuse in the fuse block position for the horn, and push and hold the horn button panel on the steering wheel for several seconds to a minute. I then check the fuse to see if it has blown.
IF a short circuit exists between the fuse and the "open" harness connector [with the horn removed] the newly blown fuse confirms the short is in that section of the circuit. If that reveals no short, check the horn itself to see it it will work when connected to a 12 Volt source [battery or charger].
I check the horn by taking a couple of pieces of wire [not tiny, but moderately heavy] to use as "jumpers" from the battery to the horn [or you could remove the horn and test it with a battery or charger power supply on your workbench].
Connect one jumper from the Negative terminal of the battery to either terminal in the horn connector plug. Then connect the second jumper wire to the "other" terminal inside the horn connector plug and then touch it to the Positive terminal on the battery. If the horn works, then the short is not within the horn.
If the horn doesn't work, then I use a VOM [Volt-Ohm Meter] set to a high resistance scale [say the "thousands" scale] and touch the red and black test probes to the two connectors inside the horn connector plug.
If the meter needle doesn't move, or only moves a little bit, then the horn is not shorted. [If using a digital meter, the indicated Ohms of resistance should change none or very little.]
IF the needle moves all the way to the other end of the meter face, that indicates no resistance or very little, and suggests that the horn is shorted internally.
Next I check the circuit wires and connectors from the horn to the firewall penetration connector block. Look for any wire that has been "pulled" tight around a sharp edge of the body sheet metal, or pinched between two mating sheet metal panels, or rubbed the insulation off against any contact with the grounded body sheet metal.
Then I go inside the passenger compartment and continue checking the circuit wires from the firewall penetration block to the fuse block. This part of the circuit is "downstream" from the blowing fuse. Any of the wiring from the blowing fuse back to the battery does not need to be checked as the fault will be between the fuse that's blowing and the horn itself.
What else can I help you with?
Why No air blowing out?
The most likely cause of no air blowing out of the air conditioner is a bad fan motor. It could also be a blown fuse, electrical short, or control panel. These are a few places to start looking for the problem.
1995 Chevy Lumina replaced the fuel pump but still wont start. Fuse keeps blowing. Is it the fuel pump relay?
my 99 did this. Theft deterent module/ relay had internal short. Then they also found a short in a wire.
1994 Geo Tracker keeps blowing the fuse for the coil when you turn the key on any ideas on what to check for?
You have a short somewhere Start at the coil and work back toward your battery You will need an ohm or multimeter
Flasher relay in 2001 dodge ram 1500 keeps blowing how do you find out where the electrical problem is?
If the flasher relay on a 2001 Dodge Ram 1500 keeps blowing, a person can use a multimeter to find out where the short is in the wires. Start at the flasher plug in and check all of the wiring up to the fuse box in the engine compartment. Also check the wiring in the turn signals.
Put on new starter but 30 amp fuse under hood keeps blowing and engine doesn't start what's the problem?
Wiring reversed? 12 volts going to ground? Short in wiring harness?
Fuse for your ignition fuel starter keeps blowing when you try to start your 1996 Chrysler cirrus lx?
the starter has failed.
If the ign or ignition fuse is blown what does it do?
your car wont start!
Why does ignition fuse keep blowing while trying to start a 99 Plymouth breeze 2.4L?
You have a short in the wiring.
Your 2001 2.7 dodge stratus keeps blowing starter fuses?
You have a ground wire that isn't grounded causing a shortage therefore blowing the fuse....I would start with the ground wire that is connected directly to the starter itself
Starter relay coil fuse keeps blowing when try to start. can relay be swapped diy?
Depends what make and model of car you have. But generally with a Haynes manual, yes.
Can you replace a 15 amp fuse in your car with a 20 amp fuse for a cigarette lighter It keeps blowing the 15 amp?
No, you could overload the wiring and start a fire.
The automatic seatbelts on my 89 240sx quit working the control box under the center console is good but the fuse keeps blowing what could cause the fuse to keep blowing?
A short in any part of the wiring or in the motor itself can cause the fuse to keep blowing. Don't try a bigger fuse you can start a fire that way. follow the wires from the control box to the seat belt motor and the to the fuse box. If there is any damaged wire replase it with the same gauge wire.
