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I have a 1926 Indian scout and the horn is driving me crazy :) I have tested all wires have a good head light and tail light However the horn is weak and I have cleaned all ground connections I even bought another 6 volt horn thinking the winding was bad. Horn works good with wire straight form battery works weak or not at all on bike. any thoughts???? Also can I wire it straight from battery and skip the amp meter??
 

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Also can I wire it straight from battery and skip the amp meter??
Sure, why not? Sounds, like you've got a high resistance connection somewhere in the present wiring set up. There are two typical ways to wire a horn; power through the horn with the horn button supplying ground, or, the horn grounded with the button supplying voltage. A high resistance anywhere in the system could cause problems; if the horn works ok when wired direct then do it that way.
--- Randall
 

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If the horn is insulated from the ground, the horn button is the ground. It sounds like the horn button is the weak point, clean as best as you can. Now a days they use relays on the horn. It could be a bad relay if there is one. Hope this we'll help. Good Luck.
 

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Another option is to have the horn button control a relay with it switching a direct feed from the battery. This pretty much gives you the maximum sound output on any bike.
 
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