My 12v charger is not working, which fuse would be the problem, looked at old fuse box diagram which lists that the horn and charger use the same fuse the horn works. Focus 2008 Titanium?

my guess, its a dead horn? both dead?
no actual question asked????????
the fuse is blow? in fuse box, eng. bay box.?
if no power to horn, (voltmeter)
we check power in and out of relay if there is one.
then at the horn button wire, (air bags can kill any mech. defeat them
first if heck bent to fiddly steering column parts in any why)
all this info is convered in in the FSM, get one. or login to alldata dot come. and read it.
here, ill look at yours. now.... a fast look.
ok 2 horns, hi/lo, and 1 relay in the under hood fuse box.
it should be labeled in the box, HORN
the relay can not work if the fuse is blown
or the horn enable line is dead. button.
the button grounds (0v) the relay via wire color lt.green-blu pin a11 on relay. if the a11 is at 12v the fuse is good.
if you push the horn button this A11 goes from 12v to 0v, and the relay energizes (click) and the horns both blow.
if no power makes it to the horns, the relay is bad no 12v
if by chance the relay output to horns go to 12v, then the horns are both dead.

Fuse box diagram and description for Chevrolet Tahoe


https://www.autogenius.info/chevrolet-tahoe-2003-2006-fuse-box-diagram/

You can check this website, you find there fuse box diagram and description for Acura RDX (2006 - 2008)

Acura RDX 2006 2008 fuse box diagram Auto Genius

It sounds like it could be a fuse isuue. I would first try to see if you can locate a fuse for the horn in your fuse box, ( fuse box should be inside, on the driver's side, under the dash, near the driver's door. When you remove the box cover, look on the inside of the cover, it may have fuse diagram to help you locate the fuse for the horn.

If it isn't a fuse related problem, you may need to run a new lead wire to the horn. The old wire could have be faulty from breakage, or corrosion.
That was good thinking using a jumper wire.
Best of luck!

Hi, look for a fuse marked CIG for the lighter. Look for one marked P/POINT or PWR OUTLET for the aux outlets. These fuses may be by the battery or inside the car.
I don't have diagrams for 2008, but these are the labels in the 2006 diagram.

In your owners manual go to the index and look for fuses then go to that page. Look for the horn fuse which should be in the fuse box under your hood around your engine, in your owners manual is should tell you where it's located. Find the fuse for it by looking at the diagram on your owners manual and then pull that fuse out. You should have replacement fuses in the fuse box that's in your car, you have to open the car door to get to it. If you don't have that fuse just take it up to auto zone and tell them you need a replacement for that fuse.

On this website you find fuse box diagram and description for Ford Ranger (1995)

https://www.carknowledge.info/ford-ranger-1993-1997-fuse-box-diagram/

https://www.autogenius.info/ford-ranger-1993-1997-fuse-box-diagram/

the horn circuit is that theres 12v fed to one side of horn and works when its return is grounded at the horn button,,the feed to thec/liter may also be the feed to the horn,,the horn staying on may be the button return spring has calapsed and the contacts not seperating

Diagram should be on the inside of the fuse box or relay cluster lid/cover. If Test light has 1 wire and a sharp tip? Yes, but only if you push the horn button too ;-)

My guess is that the horn lost its ground, but you can check this with the light. The horn only beeps when both GROUND and Pos 12v are present. The horn button gives the relay 12v to close, and the relay gives the horn 12v to operate. The ground is always connected.

Connect tester clipwire to 12v source (battery, headlight (has to be on) and touch its tip to metal of car. Does it light? Good. the tester is working and the 12v is a good source.

Touch one of the 2 horn connection or wires (poke it thru the plastic - why tip is sharp). Does it light? Touch the other, does it?

If both light, (1 will be brighter) we can assume the horn coil is good and it is getting a good ground and I was wrong (it happens... but not often). The side that is BRIGHTER is the ground wire side.

Now have someone mash the horn button. Do you hear a tiny click? That is the horn relay. If not, look for the horn relay fuse and replace it. If you DID hear the click, the relay coil is good and is trying to switch 12v to drive the horn.

Now is time to locate and replace the horn fuse or the relay may have bad contacts. Look at the other relay part numbers in the cluster and see if there is a match for the horn one. Swap it out and try the horn.

Hope this all helps. To 'test' the horn, touch the dim side again anf listen for a scratching sound. That is the 12v going thru the tiny bulb in the tester (a resistance) and trying to drive the horn.

Good Luck!

Usually a wire straight from the fuse box, check the fuse box for a blown fuse, if this is not the case, follow the positive wire leading to the horn back to where it hits the wiring harness, it should tie off into another system, such as the interior lighting, radio, or cigarette lighter