Moin moin, I’m driving a 2019 Sportster Custom. 2in2 KessTech Klappennauspuff is on. I drove today was able to adjust everything. Stopped at the buddy and parked for 30 minutes. Then I started again. I wanted to turn KessTech back on but nothing happened. No LED was on and no response at the switch. Just checked fuses, everything was okay. Also the wiring looks good, at least what I could see today. Where can I start looking? Is there any known Prob leme? Add to this: Three weeks ago I got a KZH side, rear Kellermann 3in1 Bullet and front Mini Flasher. Everything was installed by my workshop. I could read out the error memory, the following was to be seen: BCM Codes B2141 Left front turn signal output open circuit turn signal front left open B2146 Right front turn signal output open circuit turn signal front right open B2151 Left rear turn signal output open circuit turn signal rear left open B2156 Right rea r turn signal output open circuit turn signal rear right open B2161 Brake lamp output open circuit brake light open B2271 BCM low voltage BCM voltage too low After the conversion, however, I have already driven several times and today had a problem for the first time, but only with the KessTech. Everything else works perfectly. Machine goes easy and otherwise no sign of problems.