88GTKid

Hi again, Mustang people! I need to ask another question about my non sounding horn.I unplugged the horns themselves and get 12.40 volts at the horn plugs when someone hits the horn pad.I can also hear the relay clicking .My problem is when I plug the horns back in and try to sound them ,I immediately blow the fuse.My question is :Am I supposed to be getting a full 12 volts at the horns,or is the relay bad?The horns do sound when I hit them with a wire straight from the battery.If I was grounding out,the fuse would blow right away,not just when the horn is under load, correct? HELP??????!!!!!

Thanks in advance for any help

Boss_Hotrod

Sounds like youve got a ground or short somewhere between the relay and the horn. Best bet is to tak ethe horn off and check all connection in it and then put a new load in the circut and see what happens when you close it.

hammeron

"I unplugged the horns themselves and get 12.40 volts at the horn plugs
when someone hits the horn pad."
-
This tells me that there is no direct short (from positive to ground) looking back towards the
relay...
-

"I can also hear the relay clicking .My problem is when I plug the
horns back in and try to sound them ,I immediately blow the fuse."
-
Here is where the speculation begins....it could be a) the relay is
arcing (not making good solid contact when it's suposed to) or
b) the horns themselves are drawing more current then the fuse
will allow (bad horn(s)). My money would be on b although I'm
not a gambling man.
-
-
-
"My question is :Am I supposed to be getting a full 12 volts at the horns,or is the relay bad?The horns do sound when I hit them with a wire straight from the battery.If I was grounding out,the fuse would blow right away,not just when the horn is under load, correct? HELP??????!!!!!

Thanks in advance for any help "

90GTRagtop

Yes you should be getting full voltage to the horns. What fuse is blowing? What happens if you only plug up one horn? Are you sure the fuse is the right size? Have you added anything to the circuit that could put the fuse over the limit when the horn is activated? You could have a horn that's pulling too much (as hammeron said) or you could have other components on the circuit and the horn puts it over the limit. A direct short elsewhere in the circuit should blow the fuse with the horns unplugged.

5.0FoxBody

Mine does the same thing for some reason. Fuse is correct according to the manual. but maybe I should try a larger amp fuse? [&:]

sgt_pepper17

DO NOT TRY A LARGER AMP FUSE!!!! FOR THE LOVE OF GOD AND ALL THINGS HOLY, INCLUDING YOUR MUSTANG, DO NOT PUT IN A BIGGER FUSE!!!! This is the worst idea since a movie about going fast for a years salary staring Vin Deisil and Paul Walker. The fuse is not there to determine how much the horns need, it's there because the wires can't handle any more than that amount of amperage at 12 volts. So by puting in a bigger fuse, you're going to smoke your wiring and maybe burn your car to ashes.... GET THE FRIGGIN PICTURE?!?!

90GTRagtop

Like Sarge says, don't go larger than specified. I was mearly asking if you've made sure you don't have smaller than spec'd. The fox body's are not noted for their electrical robustness to begin with (see GT factory fog light issues for example). If fuses are blowing, there is a reason, and you should find what the reason is. That's how fires begin.

Hey Sarge, are you the same one I'm talking to on the Explorer forum regarding an ignition switch?