MTX Thunder 92001

LED400 stays lit when I have rail to rail and when I lose rail to rail. Attached is what the emitter of A06 looks like when I have rail to rail. When I lose rail to rail emitter looks like the other photos.
 

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UPDATE: The amp is working. Apparently this amp has a regulated powersupply and that’s why the rail to rail looks like that over 12 volts. I used another set of RCA’s installed in vehicle and has been playing fine. Ill watch it to make sure but never seen a regulated powersupply that kicked in at 12 volts.