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Re: horn question for Ari Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 4 Feb 2005 06:49:30
In Reply to: horn question for Ari, bj, Thu, 3 Feb 2005 13:36:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I assume that from your post, when you jumper 30 to 87, the horn sounds. That is as it should be.
Pin 86 is indeed 12 volts all the time. It is wired that way. Pins 85 and 86 are the relay coil. 85 is the key - 85 connects through the horns switch to ground. 12 volts flows through the horn fuse, to pin 86, through the relay coil, out 85, and through the horn switch to ground.
Remove the relay. Put one meter lead into pin 85 of the socket. Put the other lead to ground. Set the meter to read ohms. It should be an open circuit. When you press the horn button, it should read very low resistance (a few ohms). If it doesn't, the it could be a few things, but most likely the clockspring or the horn button itself.
If you see low ohms when you press the horn button, put the relay back in, but not all the way. Set your meter to volts, with the ground lead on ground. Touch pin 85, and DON'T press the horn - you should see 12 volts - this tells you that the relay coil is there. If not, you need a new relay. Now, press the horn button (this will probably require an assistant, unless you've got VERY long arms). When the horn button is pressed, the voltage on pin 85 should drop to near 0 volts. If it stays at 12, the problem is still the clockspring or horn button. If it drops some, but doesn't go to zero, then it's the contacts on the horn button; the clockspring is OK. Not sure how that info helps, but there it is.
If the voltage on pin 85 drops below about 4 or 5 volts, the relay should pull in. You should feel it click in your hands. If you feel it click, but the horn doesn't sound, then the contacts inside the relay for the horn are dirty. You have two choices - 1 - replace the relay, or 2- fix the relay. TO fix it, pop the case open - the bottom is held on to the case with clips. Pop the bottom out. The contacts are on the moving bit. Clean between them with a little fine sandpaper - you just want to take the black crud (carbon) off - you don't want to tear off the plating. Just a couple/three light swipes with some 400 grit or an emery board is fine.
I hope this helps.
posted by 192.249....
, Fri, 4 Feb 2005 06:49:30 <-- Viewing This Message
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