Does the relay click when you supply 12 vdc and ground from the battery with test leads? Will this cause the horn to blow?
No: Check polarity of relay. Some are polarized with a small diode inside to prevent damage by a collapsing magnetic field when the relay's coil is released. The case should be stamped with the connections. Try again with reversed leads. Yes: Great! The relay is good, as is your wiring to the horns. We just need to get the relay to work from the wires attached to the car- they always work on the bench but Lucas lives on. If the relay works with 12 vdc applied with the test leads, reconnect the horn to the harness and try only jumping a wire from the positive battery terminal to the positive terminal on the relay. Hit the horn button. Does it work? No: The relay is not receiving the switched ground current from the horn button. That passes from the front of the chassis to the steering rack via a small flexible strip on top of the grease nipple of the steering box. The current passes through this column to a sliding joint with another flexible strip. On up to the center of the steering column to the switch. With a test light connected to a good known source of constant 12 vdc, touch the horn contacts in the steering wheel. If test light lights up with the contacts closed, then you know the ground path from chassis to that point is good. That's the hardest part. Follow the lead as it exits the steering column under the dash and continues to the horn relay itself. Keep testing it at various points to make sure the current flows when you hit that horn button all the way to the terminals on the relay. Yes: You're not getting a constant 12 vdc to the relay. While you could bypass that with your own wiring, it's better to go back from the relay through the harness and find out where it is no longer making contact. Having a couple of 8 foot lengths of test lead works wonders for bypassing issues while testing. It's cheap and very easy to make from wire and alligator clips. -Vegaman Dan --------------------- This message has been sent by Dan Canaan, aka Flinthoof. All content is copyrighted by this individual for better or for worse, especially if there is mint involved. We thank you for your support. Please give mint to your local Mint Cross Center. /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
