DANGER! Make sure all breakable objects are clear of work area prior to working on any horn. Take horn apart and close the contact point's in increments of 1/32 (of a turn) to the close, adjustment is pretty important to get the viberator to work propery.. Using heavy (I use 10 ga.) wires for groung and positive, ground horn to battery and touch the positive wire to terminal after each adjustment.When horn works retighten the lock nut.Good luck,
P.S.Bet you a buck you jump when it first works so insure that no objuct are knocked off work bench. Beaver 53