What did I do to my amp and can I fix it?
Short version: Amp installed with 2-12" subs. Works great. Uninstall everything to replace with single sub set up. Bought a single sub box, but using same old sub. Go to reinstall amp, small spark when plugging in pos wire, amp doesn’t go on… Red light appears with “status” under it (I assume protection mode)… Anything I can do to check what is wrong/fix it? Amp is Audiobahn A435HCT.
The manual for your amp suggests a short in the speaker wire. Have you tried disconnecting the speaker wires from the amp and powering it on again? You might also check the fuses (although the manual doesn’t say that). If that still results in a red status light, then you’ve probably damaged one or more power transistors. Fixing this without some background in electronics is going to be difficult, and it may not be worthwhile to have it professionally repaired (although you may be able to find a shop online that can do it cheaper than a local place).