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Can you expound on your problem a bit? Are you saying the gauge shows discharge when the horn honks or just the horn honks for no reason? Are you showing 13.6+ volts with the new alternator?
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
If you are loosing the one chassis diode on the isolator and not some internal connection issue . You should be able to swap battery cables or flip it over if the cables wont reach. To at least test the alt. to chassis diode on isolator.