I am running CTS 2 w. Turbo timer and when I push train horn button it will activate my turbo timer shut down screen. I have it on egt so my truck doesn't actually shut off rolling down the road. Horn set up below

40a fused wire from batt to relay in toolbox. Train horn button hot is tapped into that for power and grounded to battery. Toggle for compressor has a switch wire running to relay to engage compressor. The other 2 prongs on the relay are for getting compressor power and tank power.

I am stumped as to why timer would go off when it is not tapped into any of those wires but is just connected to fuse 21 for power - any ideas?

 

Added a relay from switch to horns and solved it- edge has had issues with accessories/wipers using similar voltage patterns as the turbo timer which causes the malfunction. Hopefully this helps someone in the future!