Re: 12 volt power (while engine running) source
Air horns finally working. I had plumbed the air lines backwards. All four connections were leaking air even though I'd put teflon on each. Took old off and put new teflon on, extra turn with wrench on each and no leaks. Moved the solenoid off the 1.6 gallon tank to the base of the Hadley Bully horns, had to move ground wire but found existing ground few inches away from horns.
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