Hey Are you sure that the terminal isn't shorted to the case of the amp? which means explain a little what is a output transistor and would that be related with the sound witch it does have
Car Audio & Video - Lightning Audio - b2.250.1 Car Audio Amplifier
Answers & Comments
The larger transistors clamped to the the heatsink are the output transistors. The sample amp on the page that I posted on the previous message explains the basics. I would need clear photos of the inside of the amp to be more specific.