Good morning all, new to the forum so I apolagize if this is a redundat post, I looked around the past threads and could not find similar questions. I am troubleshooting a Howler system. Symptoms are the regular siren on the ambulance is operational , when I press the howler button however it has no effect. The siren continues to operate normally. I checked all the fuses , Tested voltage behind the button (I have 12V there and when I press the button the voltage drops to zero as expected) . I visually inspected the wiring going into the howler under the bumper area and seems ok. I disconnecetd from the connector just before the howler and was attempting to get an OHM reading but it is reading OL seemingly like an open. Does anyone have an idea what I should be getting for resistance or if thats even a valid test. My next step was going to hook back up and check for voltage at this connector with someone activating the siren and Howler button. Please let me know if I'm way off here as I am relatively new to this system. . Thanks in advance , Tom