Delta Gangway horn troubleshooting?

[WillWork4Parts]

Most all of what I've found so far is Wanted and Sold ads for these horns. What I'm looking for is information on troubleshooting issues and possibly literature showing how it is supposed to be assembled.

The insulator washer stack and proper adjustment screw are what I'm unsure of on this unit. I'm getting pretty tired of disassembling and reassembling the horn, so I came here to see what others have done in the past.

I've went from just wire sparks, to clicks, to a weak hum, and now nothing. So I'm taking a break. Ha When it was humming, I could press on the center of the diaphragm and change the tone, but adjusting the screw was only affecting it in an on/off sense. Thanks in advance for any response!

 

[catfish]

If it clicks, you are getting close. It can be a very fine line.... You need to back off the locking nut, and adjust the set screw very slowly. As you are hitting the button. once it clicks, go slower until it beeps. Them tighten the lock nut.

 

[catfish]

 

[WillWork4Parts]

View attachment 1843998

Thanks for the solid advice Catfish, but that's what I've already been doing. I've got patience for the slow turn, but even when I find that sweet spot, all I get is a soft hum, turn it towards the louder direction and it drops the tone completely.

Got a couple pictures of an original adjustment screw? When I first started it had an insulator between the arched spring washer and the aft case, then an insulator that fit in the hole of the adjustable points bar, then another insulator on top and then the screw head, that's when it only sparked wires. The adjustment screw couldn't move the points apart. I swapped the spring washer order to next to the case, then insulator and that's the first hum I got out of it.

It's humming now, but definitely nothing loud enough. Frustrating, I'm going for a long ride I think.