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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: drew4x4 on March 01, 2010, 07:26:01 pm

Title: double horn, hi low?
Post by: drew4x4 on March 01, 2010, 07:26:01 pm

did the earlier models have two horns, or just one? when did they switch, if they did?

my 77 only has one horn, behind the driver's side headlights - am i supposed to have two?  
its a 77 K20 Bonanza edition

Title: Re: double horn, hi low?
Post by: Lt.Del on March 01, 2010, 08:28:48 pm

you're supposed to have two horns.

Title: Re: double horn, hi low?
Post by: drew4x4 on March 05, 2010, 07:51:05 pm

i found the second horn wire, where the horn was supposed to be!

i replaced the relay with a brand new one. the relay clicks when i ground the horn button like it should,
but with a 12 volt tester at the horn wire there is no power at the horns.
do i need to replace my fuse box? or the wire that runs from the fuse box to the horns?

thanks in advance!

Title: Re: double horn, hi low?
Post by: drew4x4 on March 13, 2010, 04:33:25 pm

bump-with the relay unplugged from its harness, probing all three sockets that it plugs into with a 12v test light - aren't one of the wires going into the relay supposed to be live at all times? there is no constant power to any of them, which certainly narrows my horn problem down!

Title: Re: double horn, hi low?
Post by: SeanD on March 16, 2010, 12:52:28 pm

Yes. 

Like this?
(http://www.secondchancegarage.com/articles/images/relay/hornrelay.gif)

Title: Re: double horn, hi low?
Post by: drew4x4 on March 16, 2010, 08:54:09 pm

that is an awesome diagram. thanks.