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So I found the large wire harness that the park brake on light plugs into module for buzzer. It was unplugged. Now once I plugged it in the buzzer and park brake works. Thank you! Sent from my SM-G950U using Tapatalk

Thanks! So bulb is good. No power at bulb. Tring to trace wires not sure where buzzer is located. Any thoughts? Sent from my SM-G950U using Tapatalk

I'm new to the forum as I just purchased my first m923a2. Upon starting the truck with park brake on, the buzzing I hear in the videos is not sounded nor is the red light on the dash visible. I fo idle before I release the park brake upon desired 120 lbs in both tanks. I know the buzzer...

So this knob on the far right should not be pushed in unless you have a brake problem. In other words under normal conditions it should always be pulled out. Thank you again! Sent from my SM-G950U using Tapatalk

Thank you for the very good explanation Sent from my SM-G950U using Tapatalk

I guess I just don't understand its purpose or what it is indicating Sent from my SM-G950U using Tapatalk

Thank you, I'll check it out tomorrow. Sent from my SM-G950U using Tapatalk

I'm new to this and just purchased a m939a2. Should the green spring brake override be lit when driving the truck? Sent from my SM-G950U using Tapatalk

How would I "jump the starter connections if the control box or starter switch is broken". Thank you for your response and help.

I'm new to the forum, thank you for the add. I'm looking at a 1991 m923a2 and was wondering if this model would survive a EMP and still work? Thanks!