Cannot get my horn to work on my "68 GMC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Longhorn 70 · 12-23-2012, 11:37 PM

can you run a jumper from 12 volts to the coil of the horn relay? You can tell which is the coil by using a DMM in the ohms scale on the low range. Touch the ohm meter lead to the case of the horn relay and the other lead to each tab on the horn relay. The one that registers is the coil. Make sure the relay is grounded and touch 12 volts to that same coil lead. You should hear the relay click. if not, you have found the problem.

If it does click, when it is clicked, touch the ohm meter leads to the other 2 terminals. It should read close to 0 ohms. If not, there you go again.

Good luck

12-23-2012, 11:37 PM	#2
Longhorn 70 Registered User Join Date: Dec 2012 Location: Chandler AZ Posts: 1,149	Re: Cannot get my horn to work on my "68 GMC can you run a jumper from 12 volts to the coil of the horn relay? You can tell which is the coil by using a DMM in the ohms scale on the low range. Touch the ohm meter lead to the case of the horn relay and the other lead to each tab on the horn relay. The one that registers is the coil. Make sure the relay is grounded and touch 12 volts to that same coil lead. You should hear the relay click. if not, you have found the problem. If it does click, when it is clicked, touch the ohm meter leads to the other 2 terminals. It should read close to 0 ohms. If not, there you go again. Good luck __________________ 1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9



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