[Licensed to kill]

Been having issues with my horn. Sometimes it works, sometimes it doesn't, sometimes it "sorta" works with the "sick cow" syndrome. Through a little testing yesterday I discovered that, it works best with the car not running. With the car running and the cowl lights on, the Ammeter draws 7 amps and dos to 16 amps when the horn button is pushed but the horn won't function. If I rev up the engine, the horn will start to function in the slow sick cow range. With the car idling and the cowl light s of it will sometimes moan. Seems like it just isn't getting enough juice when the car is running unless the engine is reved up and even then not always enough for full function. Does this mean that I need to adjust my generator??. The horn is an aftermarket 6V horn with no adjustment screw. If I run wires directly to the battery it works great. PS. I removed the horn button and checked it out and all looks good in there.